CN114105556A - High-performance quick-setting early-strength concrete and preparation method thereof - Google Patents

High-performance quick-setting early-strength concrete and preparation method thereof Download PDF

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Publication number
CN114105556A
CN114105556A CN202111381603.7A CN202111381603A CN114105556A CN 114105556 A CN114105556 A CN 114105556A CN 202111381603 A CN202111381603 A CN 202111381603A CN 114105556 A CN114105556 A CN 114105556A
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China
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parts
concrete
quick
setting
water
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Inventor
宋立峰
余长虹
赖俊荣
林希昌
蔡心映
梁大宾
李洪明
牟联懋
于婷
宋高峰
吕墨
钟小勇
唐凤
陈丹
刘俊
李朋
李刚
李荣金
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Shenzhen Hongsheng Building Material Co ltd
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Shenzhen Hongsheng Building Material Co ltd
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Priority to CN202111381603.7A priority Critical patent/CN114105556A/en
Publication of CN114105556A publication Critical patent/CN114105556A/en
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/043—Alkaline-earth metal silicates, e.g. wollastonite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/36—Inorganic materials not provided for in groups C04B14/022 and C04B14/04 - C04B14/34
    • C04B14/366—Phosphates, e.g. apatite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/0048—Fibrous materials
    • C04B20/0068—Composite fibres, e.g. fibres with a core and sheath of different material
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/281—Polyepoxides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/32—Polyethers, e.g. alkylphenol polyglycolether
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F1/00—General methods for the manufacture of artificial filaments or the like
    • D01F1/02—Addition of substances to the spinning solution or to the melt
    • D01F1/10—Other agents for modifying properties
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/02—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from cellulose, cellulose derivatives, or proteins
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/10—Accelerators; Activators
    • C04B2103/12—Set accelerators
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/34—Non-shrinking or non-cracking materials
    • C04B2111/343—Crack resistant materials

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Civil Engineering (AREA)
  • Textile Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Composite Materials (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The application relates to high-performance quick-setting early-strength concrete and a preparation method thereof. The preparation method comprises the following steps: mixing epoxy resin, nano hydroxyapatite, modified graphene fiber and wollastonite powder, and uniformly stirring at 50-60 ℃ to obtain a reinforcing filler; step two, uniformly mixing the water reducing agent and the quick setting agent to obtain a mixed reagent; uniformly mixing cement, silicon powder, slag, slaked lime powder, a reinforcing filler, a mixing reagent and water to obtain cement slurry; adding the medium sand and the recycled aggregate into the cement slurry and uniformly mixing to obtain a concrete mixture; and step five, standing and curing the mixture to obtain the concrete. This application has the effect that promotes the later stage intensity of early strong concrete of rapid hardening.

Description

High-performance quick-setting early-strength concrete and preparation method thereof
Technical Field
The application relates to the technical field of building materials, in particular to high-performance quick-setting early-strength concrete and a preparation method thereof.
Background
The artificial stone is prepared from cementing material, aggregate, water, additive and admixture through proportional mixing, stirring, compacting, curing and hardening. With the rapid development of economy in China, the pace of urban construction is accelerated, and buildings and concrete pavements are covered and popularized, thereby bringing great convenience to traffic and people's trip.
In the projects such as concrete pavements, airport runways and the like needing quick repair and the rapid rush-repair and rush-construction projects such as harbor wharfs, bridges, tunnels and the like, the high requirement is placed on the rapid setting early strength of concrete, the existing early strength concrete mainly shortens the cement setting time by accelerating the hydration speed of cement, thereby enhancing the performance of the rapid setting early strength of concrete, but because the cement hydration speed is accelerated, the hydration heat is concentrated and the heat release is concentrated, after the concrete is poured, the internal and external temperature difference is increased, the temperature stress causes the increase of fine cracks in the concrete structure, the schedule of the construction period is required to be tight, the moisture preservation and heat preservation maintenance are difficult to be carried out according to the standard after the concrete is poured, and the existing rapid setting early strength concrete has the defects of later strength shrinkage and low strength performance.
Disclosure of Invention
In order to improve the later strength of the quick-setting early-strength concrete and enhance the strength performance of the concrete, the application provides the high-performance quick-setting early-strength concrete and the preparation method thereof.
In a first aspect, the application provides a high-performance quick-setting early-strength concrete which adopts the following technical scheme:
the high-performance quick-setting early-strength concrete is prepared from a concrete mixture, wherein the concrete mixture comprises the following components in parts by weight:
138 portions and 158 portions of water;
cement 690 and 750 parts;
70-90 parts of silicon powder;
90-120 parts of slag;
600 portions of medium sand 560-;
848 regenerative aggregate and 888 parts;
13.8-15 parts of a water reducing agent;
20.7-22.5 parts of a quick-setting agent;
10-15 parts of slaked lime powder;
53-71 parts of epoxy resin;
47.5-57.5 parts of nano hydroxyapatite;
36-50 parts of modified graphene fiber;
40-50 parts of wollastonite powder;
the preparation method of the modified graphene fiber comprises the following steps:
s1: mixing graphene oxide, ultrashort jute silk, carboxymethyl cellulose and water, wherein the mass ratio of graphene fiber to ultrashort jute silk to carboxymethyl cellulose to water is (1-1.5) to 1:0.2:3, and uniformly stirring to obtain a fiber mixed solution;
s2: extruding the fiber mixed solution into a coagulating bath to obtain a gel-like modified graphene fiber;
s3: and washing and drying the gel-like modified graphene fiber to obtain the modified graphene fiber.
By adopting the technical scheme, the concrete mixture is doped with silica powder, and the silica powder reduces C in a cement system3The amount of A and C3S, and the gel product can perform secondary hydration reaction with calcium hydroxide, and the generated gel product fills capillary pores of the cement stone, so that the compactness of the cement stone is improved; the quick-setting agent is added into the mixture, the quick-setting agent is matched with the water reducing agent and the hydrated lime powder to promote the hydration reaction of the cement, a large amount of hydrated calcium silicate gel, calcium hydroxide crystals and ettringite crystals can be formed in a short time at the early stage, a large amount of ettringite forms a space network structure,calcium silicate hydrate and the like are inserted into the cement paste to form cement paste with higher strength, so that the quick setting and early strength of the concrete are realized.
The modified graphene fibers, the nano-hydroxyapatite, the wollastonite powder and the epoxy resin are mixed according to a certain proportion and act together, a complex with a node net structure is possibly generated, wherein the modified graphene fibers are mutually entangled and lapped to form net veins of the complex, the nano-hydroxyapatite and the wollastonite are agglomerated to form vein nodes, and the epoxy resin is used for filling among the net voids of the complex to tightly connect all the components.
The complex with the node net structure has higher node strength and cohesiveness, and can be filled into cracks generated in the concrete due to concentrated hydration heat temperature and temperature pressure of the quick-setting early-strength concrete, so that the cohesiveness among all components in a concrete system is enhanced; the fiber net of the complex can tightly connect the crack of the crack through a plurality of contact points, the tendency of the crack to continue cracking is slowed down, and the net structure of the complex has good extension deformation capability, thereby being beneficial to enhancing the compression resistance, deformation resistance and crack resistance of concrete; and the node of the complex has higher strength and hardness, which is beneficial to enhancing the strength of the later crack of the concrete, so that the later strength of the concrete is kept stable, and the retrogradation of the later strength of the quick-setting early-strength concrete is reduced.
In the preparation method of the modified graphene fiber, a fiber mixed solution is prepared firstly, all the components are fully mixed, graphene oxide and ultrashort jute silk are interwoven and fused under the assistance of carboxymethyl cellulose and water in the mixing process to form the dendritic modified graphene fiber, the prepared modified graphene fiber has high strength and high toughness, the special dendritic structure of the modified graphene fiber is favorable for being fully combined with epoxy resin, wollastonite powder and nano hydroxyapatite in a reinforcing filler, the structural stability of a complex formed by the four components is strong, and the reinforcing and anti-cracking effects on concrete are good.
Preferably, the concrete mixture also comprises 10 to 15 parts by weight of polyethylene wax.
Through adopting above-mentioned technical scheme, low molecular weight polyethylene has very excellent external lubrication and stronger inside lubrication, and low molecular weight polyethylene adds in the concrete mixture, is favorable to promoting the dispersibility of wollastonite powder and nanometer hydroxyapatite to be favorable to the silica limestone powder of reunion and the abundant combination between nanometer hydroxyapatite and modified graphene fiber, the epoxy, and then the reinforcing is interweaved and is woven the structural stability of network structure.
Preferably, the concrete mixture also comprises 3-5 parts by weight of alkylphenol ethoxylates.
By adopting the technical scheme, the alkylphenol polyoxyethylene is added into the concrete mixture, and the surface activity of the whole system can be reduced, so that the complex with the node net structure has high permeability and can fully permeate into gaps of concrete, the complex is more fully and strictly filled, and the reinforcing effect of the reinforcing filler on the concrete is further enhanced.
Preferably, the quick-setting agent is prepared by mixing triethanolamine, calcium aluminate, aluminum sulfate, sodium carbonate and water according to the mass ratio of (2-4) to 11:2:3: 20.
By adopting the technical scheme, the triethanolamine can obviously reduce the surface tension of the cement paste, thereby accelerating the combination of the quick-setting agent and the cement paste; HCOO in sodium carbonate-Permeate to C3S and C2Hydration layer of S, accelerated Ca (OH)2And decomposition of calcium silicate to OH in solution on the surface of cement particles-The concentration is rapidly reduced, the unhydrated cement particles are promoted to be further decomposed, and the formation of C-S-H gel is promoted; meanwhile, in the quick-setting agent A13+、SO4-With cement hydrates and C3Hydrated and dissolved Ca of S2+The rapid combination forms a large amount of ettringite, and a large amount of ettringite crystals are mutually staggered to form a network structure to coagulate the cement, thereby realizing the rapid coagulation early strength of the concrete.
Preferably, the recycled aggregate is crushed stone with the particle size of 15-20 mm.
By adopting the technical scheme, the recycled aggregate has stronger bonding property with the cement gel material when the particle size is 15-20mm, and the prepared concrete is more compact and has higher strength.
Preferably, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent or a naphthalene water reducing agent.
By adopting the technical scheme, the polycarboxylic acid water reducing agent and the naphthalene water reducing agent have better combination effect compared with other water reducing agents and quick setting agents, so that the promotion effect on cement hydration reaction is better.
In a second aspect, the present application provides a method for preparing high-performance quick-setting early-strength concrete, which adopts the following technical scheme:
a preparation method of high-performance quick-setting early-strength concrete comprises the following steps:
mixing epoxy resin, nano hydroxyapatite, modified graphene fiber and wollastonite powder, and uniformly stirring at the temperature of 50-60 ℃ to obtain a reinforcing filler;
step two, mixing the water reducing agent and the quick setting agent, and uniformly stirring to obtain a mixed reagent for later use;
step three, mixing cement, silicon powder, slag, slaked lime powder, the reinforcing filler prepared in the step one, the mixed reagent prepared in the step two and water, and uniformly stirring to obtain cement slurry;
adding the medium sand and the recycled aggregate into the cement slurry, mixing, and uniformly stirring to obtain a concrete mixture;
and step five, standing and curing the concrete mixture to obtain the high-performance quick-setting early-strength concrete.
By adopting the technical scheme, the reinforcing filler is prepared firstly, and the materials among the reinforcing fillers can be fully combined by stirring at the temperature of 50-60 ℃, so that the generated complex with the node net structure has better structural stability; the quick-setting agent and the water reducing agent are fully mixed, and the water reducing agent and the quick-setting agent are uniformly mixed, so that the quick-setting agent can be better matched with cement slurry when being added, and the hydration reaction of cement can be promoted; silica powder, slag and hydrated lime powder are added into the cement, so that the components with less proportion and smaller mass in the raw materials can be uniformly mixed, the obstruction of the components with large mass to mixing and stirring is avoided, and the integral uniformity of the concrete is promoted.
Preferably, 10 to 15 parts by weight of polyethylene wax is also added in the step one.
Through adopting above-mentioned technical scheme, add low molecular weight polyethylene in the reinforcement filler, the low molecular weight polyethylene of being convenient for is to nanometer hydroxyapatite and wollastonite powder intensive mixing, and then plays the effect with both homodisperses in the reinforcement filler system to make the structure of the complex that the reinforcement filler generated more even stable.
Preferably, in the third step, the reinforcing filler and 3-5 parts by weight of alkylphenol ethoxylates are mixed and stirred uniformly to obtain a mixture; and then mixing the mixture with cement, silicon powder, slag, hydrated lime powder, the mixed reagent prepared in the step two and water, and uniformly stirring to obtain cement slurry.
Through adopting above-mentioned technical scheme, the reinforcement filler mixes with alkylphenol polyoxyethylene, and alkylphenol polyoxyethylene fully permeates the reinforcement filler for the reinforcement filler can fully combine with other components in the concrete more easily when the stirring, and then more is favorable to strengthening the intensity of concrete later stage fracture department.
In summary, the present application includes at least one of the following beneficial technical effects:
1. modified graphene fiber, nano hydroxyapatite, wollastonite powder and epoxy resin are doped in the quick-setting early strength concrete mixture, and under the combined action of the mixture of the materials, a complex with a node net structure can be generated, the complex with the node net structure has higher node strength and cohesiveness, and the complex can be filled in cracks generated by the concrete due to the quick-setting early strength, so that strength support and strong adhesion are provided for later-stage cracking positions of the concrete, and the quick-setting early strength concrete has excellent performances of higher later-stage strength and difficult cracking;
2. the alkylphenol ethoxylates is added into the concrete mixture, and can reduce the surface activity of a complex generated by the action of the modified graphene fibers, the nano-hydroxyapatite, the wollastonite powder and the epoxy resin, so that the complex has high permeability and can fully permeate into concrete gaps, the complex is filled more uniformly and tightly, and the reinforcing and anti-cracking effects of the reinforcing filler on the concrete are further enhanced.
Detailed Description
The present application will be described in further detail with reference to examples.
The information on the source of the raw materials used in the following examples and comparative examples is detailed in Table 1.
TABLE 1
Raw materials Model number Source information
Ordinary portland cement P·O42.5 Guangzhou Li Wan Cheng industry material (Yingde Tai mud cement)
Slag of mine 10-20 mesh Lingshou county malin mineral product processing factory
Medium sand Fineness modulus 2.6 Lingshou county Zhenghe mineral processing plant
Recycled aggregate The grain diameter is 15-20mm City invested construction waste disposal (Guangzhou) GmbH
Silicon powder 325 mesh screen Guangzhou City promoted New trade Co Ltd
Slaked lime powder The content is 80-95% Dongguan city Dingxiang environmental protection science and technology limited company
Polycarboxylic acid high-efficiency water reducing agent PA98591-500g GUANGDONG WENGJIANG CHEMICAL REAGENT Co.,Ltd.
Naphthalene water reducing agent DNF-C Beijing Haiyan Xingye Concrete Admixture Sales Co.,Ltd.
Epoxy resin E44_6101 Guangzhou Zhouyang chemical Co Ltd
Wollastonite powder The content of silicon dioxide is 92 percent Guangdong Yongfeng chemical Co Ltd
Nano hydroxyapatite Particle size of 20nm Beijing German Kagaku island gold science and technology Co Ltd
Graphene oxide The fixed carbon content is 95 percent Shenzhen Sanhe Multi-science Co Ltd
Ultrashort jute silk The length of the fiber is 1-3mm Shandong Yinje textile Co Ltd
Carboxymethyl cellulose The content is 99 percent Dacheng county Jiebo chemical Co Ltd
Methyl cellulose CAS9004-67-5 Jiangsu Runfeng synthetic science and technology limited
Polypropylene fiber Filament number less than or equal to 2.2dtex Jining Sanshi Biotech Ltd
Polyethylene wax 3000-4000 molecular weight GUANGZHOU YUANTAI SYNTHETIC MATERIAL Co.,Ltd.
Triethanolamine 149.1882 molecular weight Guangzhou city Chunhua chemical Co Ltd
Alkylphenol ethoxylates NP-10 Guangdong three science and technology Co Ltd
Accelerating agent GH-405 Guangxi Xingao & building materials Co Ltd
Preparation example
Preparation example 1
The preparation example discloses a preparation method of a modified graphene fiber, which comprises the following specific steps:
s1, mixing 19.23kg of graphene oxide, 19.23kg of ultrashort jute silk, 3.85kg of carboxymethyl cellulose and 57.69kg of water, adding the mixture into a stirring pot, wherein the mass ratio of the graphene fiber to the ultrashort jute silk to the carboxymethyl cellulose to the water is 1:1:0.2:3, and stirring the mixture at the normal temperature for 5 hours at the rotation speed of 150r/min to obtain a fiber mixed solution;
s2, extruding the fiber mixed solution into a coagulating bath (in the embodiment, the coagulating bath adopts mixed water solution of sulfuric acid, sodium sulfate and zinc sulfate, and the coagulating bath consists of H2SO4Is 118g/L, Na2SO4Is 320g/L, ZnSO411.0g/L, the temperature of a coagulation bath is 50 ℃), and the gel-like modified graphene fiber is obtained;
and S3, washing the gel-like modified graphene fiber with deionized water, and drying at the normal temperature of 23 ℃ for 24 hours to obtain the modified graphene fiber.
Preparation example 2
The difference between the preparation example and the preparation example 1 is that the fiber mixed solution in S1 has different contents of each component, specifically: 26.32kg of graphene oxide, 17.54kg of ultrashort jute silk, 3.51kg of carboxymethyl cellulose and 52.63kg of water are mixed and added into a stirring pot, and the mass ratio of the graphene oxide to the ultrashort jute silk to the carboxymethyl cellulose to the water is 1.5:1:0.2: 3.
Preparation example 3
The difference between the preparation example and the preparation example 1 lies in that the fiber mixed solution in S1 has different contents of each component, specifically: 32.26kg of graphene oxide, 16.13kg of ultrashort jute silk, 3.23kg of carboxymethyl cellulose and 48.38kg of water are mixed and added into a stirring pot, wherein the mass ratio of the graphene oxide to the ultrashort jute silk to the carboxymethyl cellulose to the water is 2:1:0.2: 3.
Preparation example 4
The quick-setting admixture of the preparation example is a commercial GH-405 type quick-setting admixture.
Preparation example 5
The preparation example discloses a preparation method of a quick-setting agent, which specifically comprises the following steps: adding 5.26kg of triethanolamine, 28.95kg of calcium aluminate, 5.26kg of aluminum sulfate, 7.89kg of sodium carbonate and 52.63kg of water into a stirring pot for mixing, wherein the mass ratio of the triethanolamine to the calcium aluminate to the aluminum sulfate to the sodium carbonate to the water is 2:11:2:3:20, and stirring for 5 minutes at the rotating speed of 50r/min and the temperature of 23 ℃ to obtain the quick-setting agent.
Preparation example 6
The difference between the preparation example and the preparation example 5 lies in that the content of each component of the quick-setting agent is different, and specifically comprises the following steps: 10kg of triethanolamine, 27.5kg of calcium aluminate, 5kg of aluminum sulfate, 7.5kg of sodium carbonate and 50kg of water are added into a stirring pot to be mixed, namely the mass ratio of the triethanolamine, the calcium aluminate, the aluminum sulfate, the sodium carbonate and the water is 4:11:2:3: 20.
Preparation example 7
The difference between the preparation example and the preparation example 5 lies in that the content of each component of the quick-setting agent is different, and specifically comprises the following steps: adding 1.37kg of triethanolamine, 30.14kg of calcium aluminate, 5.48kg of aluminum sulfate, 8.22kg of sodium carbonate and 54.79kg of water into a stirring pot for mixing, wherein the mass ratio of the triethanolamine to the calcium aluminate to the aluminum sulfate to the sodium carbonate to the water is 0.5:11:2:3: 20.
Examples
Example 1
The embodiment discloses a high performance quick setting early strength concrete, is formed by concrete mix preparation, and concrete mix includes: 690kg of P & O42.5 ordinary portland cement, 70kg of silicon powder, 90kg of slag, 560kg of medium sand, 848kg of recycled aggregate, 13.8kg of polycarboxylic acid water reducing agent, 20.7kg of quick-setting agent, 10kg of slaked lime powder, 53kg of epoxy resin, 47.5kg of nano hydroxyapatite, 36kg of modified graphene fiber, 40kg of wollastonite powder and 138kg of water.
The embodiment also discloses a preparation method of the high-performance quick-setting early-strength concrete, which comprises the following steps:
step one, mixing epoxy resin, nano hydroxyapatite, the modified graphene fiber prepared in preparation example 1 and wollastonite powder, pouring the mixture into a stirrer, and stirring the mixture for 10 minutes at the temperature of 50 ℃ and the rotating speed of 50r/min to obtain a reinforcing filler;
step two, mixing the polycarboxylic acid water reducing agent and the quick-setting agent prepared in the preparation example 4, pouring the mixture into a stirrer, and stirring for 5min at the temperature of 23 ℃ and the rotating speed of 40r/min to obtain a mixed reagent;
step three, mixing the P.O 42.5-grade ordinary portland cement, slag, silicon powder, hydrated lime powder, the mixing reagent prepared in the step two, the reinforcing filler prepared in the step one and water, pouring the mixture into a stirrer, and stirring for 7 minutes at the temperature of 23 ℃ and the rotating speed of 50r/min to obtain cement slurry;
adding the medium sand and the recycled aggregate into the cement slurry, and stirring for 10 minutes at the temperature of 23 ℃ and the rotating speed of 60r/min to obtain a concrete mixture;
and step five, standing the concrete mixture for a day and a night at the temperature of 23 ℃, and then putting the mixture into a standard curing room with the temperature of 20 ℃ and the relative humidity of 95% for curing for 28 days to obtain the high-performance quick-setting early-strength concrete.
Examples 2 to 5
The preparation method of the high-performance quick-setting early-strength concrete is different from that of the embodiment 1 in the following points that the dosage of each raw material component is different, and the temperature of the reinforcing filler during preparation is also different. The amounts of the respective raw material components (unit: kg) and the temperatures (unit: DEG C) at the time of preparation of the reinforcing fillers of examples 2 to 5 are specified in Table 2.
TABLE 2
Figure BDA0003365821330000071
Figure BDA0003365821330000081
Examples 6 to 7
The preparation method of the high-performance quick-setting early-strength concrete is different from the embodiment 5 in that in the step one, the modified graphene fibers prepared in the preparation examples 2 and 3 are respectively selected as the modified graphene fibers.
Examples 8 to 10
The preparation method of the high-performance quick-setting early-strength concrete is different from the preparation method of the example 5 in that polyethylene wax is also added in the step one, and the adding amount of the polyethylene wax is shown in a table 3.
TABLE 3
Item Example 8 Example 9 Example 10
Input amount (kg) 10 15 20
Examples 11 to 13
A preparation method of high-performance quick-setting early-strength concrete is different from the embodiment 5 in that in the third step, reinforcing filler and alkylphenol ethoxylates are added into a stirrer to be mixed, and the mixture is stirred for 5 minutes at the temperature of 23 ℃ and the rotating speed of 50r/min to obtain a mixture; and then mixing the mixture with cement, silicon powder, slag, slaked lime powder, the mixed reagent prepared in the step two and water. The amount of alkylphenol ethoxylates added is shown in Table 4.
TABLE 4
Item Example 11 Example 12 Example 13
Amount added (kg) 3 4 5
Examples 14 to 16
The difference between the preparation method of the high-performance quick-setting early-strength concrete and the embodiment 5 is that in the step two, the quick-setting agents prepared in the preparation examples 5-7 are respectively used as the quick-setting agents.
Example 17
A preparation method of high-performance quick-setting early-strength concrete is different from the embodiment 5 in that 10kg of polyethylene wax is also added in the step one; in the second step, the quick-setting agent prepared in preparation example 5 is selected as the quick-setting agent; adding the reinforcing filler and 4kg of alkylphenol polyoxyethylene into a stirrer, and stirring for 5 minutes at the temperature of 23 ℃ and the rotating speed of 50r/min to obtain a mixture; and then mixing the mixture with cement, silicon powder, slag, slaked lime powder, the mixed reagent prepared in the step two and water.
Comparative example
Comparative example 1
The preparation method of the high-performance quick-setting early-strength concrete is different from the embodiment 5 in that the wollastonite powder is replaced by the same amount of epoxy resin.
Comparative example 2
The preparation method of the high-performance quick-setting early-strength concrete is different from the embodiment 5 in that the nano-hydroxyapatite is replaced by the epoxy resin with the same amount.
Comparative example 3
The preparation method of the high-performance quick-setting early-strength concrete is different from that in the embodiment 5 in that the modified graphene fiber is replaced by epoxy resin with the same amount.
Comparative example 4
The preparation method of the high-performance quick-setting early-strength concrete is different from the embodiment 5 in that the wollastonite powder, the nano-hydroxyapatite and the modified graphene fiber are replaced by the same amount of epoxy resin.
Comparative example 5
The preparation method of the high-performance quick-setting early-strength concrete is different from the embodiment 5 in that ultrashort jute threads in the modified graphene fibers are replaced by equal amounts of polypropylene fibers.
Comparative example 6
The preparation method of the high-performance quick-setting early-strength concrete is different from that in the embodiment 5 in that carboxymethyl cellulose in modified graphene fiber is replaced by equal amount of methyl cellulose.
Performance test
1. The test of the setting time of the quick-setting, quick-hardening and high-strength concrete comprises the following steps: the setting times of the accelerating agent accelerated cement slurries of examples 1 to 17 and comparative examples 1 to 6 were measured according to the test method of JC477-2005 Accelerator for sprayed concrete, wherein the setting time experiment of the neat slurry was carried out with reference to JC/T727-2005 Instrument for measuring the standard consistency and setting time of the neat cement slurry, and the relevant data were recorded.
2. And (3) detecting the compressive strength: according to the method for testing the compressive strength in GB/T50081-2016 standard on the mechanical property test method of common concrete, the concrete obtained in the examples 1-17 and the comparative examples 1-6 after standing and curing for 6h, 1d, 28d and 90d is detected, the obtained concrete is made into a cubic test piece of 100mm multiplied by 100mm, the test piece is extruded by a material testing machine until being damaged, and the related data is recorded for calculating the compressive strength. 6h and 1d are early stages, 28d and 90d are later stages, the compressive strength directly reflects the compressive strength performance of the concrete, and the larger the compressive strength is, the better the compressive strength performance of the concrete is.
3. Splitting tensile strength test: according to a splitting tensile strength test method in GB/T50081-2016 standard of common concrete mechanical property test methods, concrete obtained in examples 1-17 and comparative examples 1-6 after standing and curing for 90d is detected, the obtained concrete is made into a cubic test piece of 100mm multiplied by 100mm, the test piece is extruded by a material testing machine until being damaged, and relevant data are recorded to calculate the splitting tensile strength. The splitting tensile strength reflects the anti-cracking performance of the concrete, and the larger the splitting tensile strength is, the stronger the bonding force in the concrete is, and the better the anti-cracking performance is.
The specific assay data for experiments 1-3 are detailed in tables 5-11.
TABLE 5
Figure BDA0003365821330000101
According to the detection data of the examples 1-5 in the table 5, the concrete prepared by adding the quick-setting agent into the concrete formula prepared in the examples 1-5 has the setting time within 1-6min, and can meet the construction requirement of quick setting and demoulding; the compressive strength of the concrete obtained in the embodiments 1-5 after standing and curing for 6 hours can reach more than 8MPa, the early strength performance of the prepared concrete is good, the compressive strength of 28 days and 90 days can reach more than 80MPa, the compressive strength of the concrete is excellent, and the later strength is stable. Under the condition that the preparation method is not changed, when the intermediate values of the contents of the components in the formula of the example 5 are measured, the prepared concrete has the shortest setting time and the largest numerical values of the compressive strength and the splitting tensile strength, which shows that the concrete prepared in the example 5 has outstanding early strength, later strength and splitting tensile strength, so that the subsequent tests are carried out on the basis of the formula of the example 5.
TABLE 6
Figure BDA0003365821330000111
According to the detection data of example 5 and comparative examples 1 to 4 in table 6, the early compressive strength of the concrete prepared in comparative example 1 is reduced compared with the early compressive strength of the concrete prepared in example 5 as compared with comparative example 1 in the absence of the wollastonite powder in example 5, the late compressive strength of the concrete prepared in comparative example 1 is significantly lower than the late compressive strength of the concrete prepared in example 5, and the late compressive strength of comparative example 1 is reduced; the wollastonite powder has an important influence on the compressive strength of concrete, particularly the stability of later strength; the splitting tensile strength of the concrete prepared in the comparative example 1 is obviously lower than that of the concrete prepared in the example 5, which shows that the wollastonite powder also has certain influence on the anti-cracking performance of the concrete. The comparative example 2 lacks nano-hydroxyapatite compared with the example 5, and the performance of the concrete prepared by the comparative example 2 compared with that of the concrete prepared by the example 5 is the same as that of the concrete prepared by the comparative example 1 and the example 5, which shows that the nano-hydroxyapatite plays a certain role in the strength and the crack resistance of the concrete.
Compared with the concrete prepared in the example 5, the concrete prepared in the comparative example 3 is higher in early strength, smaller in later strength reduction amplitude, has the advantages of reverse shrinkage and obviously reduced splitting tensile strength, compared with the concrete prepared in the example 5, and the comparative example 3 lacks the modified graphene fiber, so that the modified graphene fiber has certain influence on the strength and the anti-cracking performance of the concrete, and plays an important role in the anti-cracking performance.
Compared with example 5, the concrete prepared in comparative example 4 lacks three substances, namely wollastonite powder, nano-hydroxyapatite and modified graphene fiber, so that the numerical values of the early and later stage compressive strength and the splitting tensile strength of the concrete prepared in comparative example 4 are far smaller than those of the concrete prepared in example 5, and the performance of the concrete prepared in comparative example 4 is inferior to that of the concrete prepared in example 5.
Compared with the example 5, the components in the reinforcing filler are changed in the comparative examples 1 to 4, so that the compression strength of the concrete prepared in the comparative examples 1 to 4 appears the phenomenon of unstable collapse at the later stage; the splitting tensile strength of the concrete prepared in the comparative examples 1 to 4 is obviously lower than that of the concrete prepared in the example 5, and the inventor thinks that a complex with a node net structure can be generated due to the mixing combined action of the modified graphene fiber, the nano-hydroxyapatite, the wollastonite powder and the epoxy resin, and the complex with the node net structure has higher strength and cohesiveness, can be filled in gaps of the concrete, provides strength support and strong adhesion for the later-stage cracks of the quick-setting early-strength concrete, is beneficial to enhancing the later-stage strength of the concrete, and maintains the stability of the concrete strength; in addition, the extension variability of the reticular complex is also beneficial to enhancing the anti-cracking performance of the concrete, so that the anti-cracking performance of the concrete is improved. The epoxy resin, the nano-hydroxyapatite, the modified graphene fiber and the wollastonite powder are synergistic, and any one of the components is lacking, so that the complex cannot be generated, and further the complex cannot play a role in reinforcing and bonding the concrete, and therefore the remarkable reinforcing and anti-cracking effect of the reinforcing filler in the embodiment 5 cannot be achieved.
TABLE 7
Figure BDA0003365821330000121
According to the detection data of the example 5 and the examples 6 and 7 in table 7, the compressive strength and the cleavage tensile strength of the concrete prepared in the example 6 were similar to those of the concrete prepared in the example 5 in which the ratio of the graphene oxide, the ultrashort jute silk, the carboxymethyl cellulose and the water was 1.5:1:0.2:3, and the compressive strength and the cleavage tensile strength of the concrete prepared in the example 7 in which the ratio of the graphene oxide, the ultrashort jute silk, the carboxymethyl cellulose and the water was 1:1:0.2:3, while the compressive strength and the cleavage tensile strength of the concrete prepared in the example 7 were lower than those of the concrete prepared in the example 5 in which the ratio of the graphene oxide, the ultrashort jute silk, the carboxymethyl cellulose and the water was 2:1:0.2:3, and the changes in the data indicate that when the ratio of the graphene oxide, the ultrashort jute silk, the carboxymethyl cellulose and the water in the modified graphene fiber was 1.5, the concrete prepared in the example 7, and the tensile strength and the cleavage tensile strength were all lower than those of the concrete prepared in the example 5, The reinforcing filler prepared when the proportion of the ultrashort jute threads, the carboxymethyl cellulose and the water is (1-1.5) to (1: 0.2: 3) is added into a concrete system can fully play the role of reinforcing and cracking resistance.
The ultra-short jute threads are replaced by polypropylene fibers in the comparative example 5, and the later-stage compressive strength and the splitting tensile strength of the concrete prepared in the comparative example 5 are reduced compared with those of the concrete prepared in the example 5, and the concrete prepared in the example 5 is also obviously reduced.
In comparative example 6, carboxymethyl cellulose was replaced with methyl cellulose, and graphene oxide and ultrashort jute filaments could not be combined with methyl cellulose to form a modified graphene fiber having a dendritic structure, thereby affecting the reinforcing anti-cracking effect of the reinforcing filler.
In comparative examples 5 and 6, the components in the modified graphene fiber are changed, the modified graphene fiber cannot be generated or the performance of the modified graphene fiber is reduced, and the good effect in example 5 cannot be achieved, and the reinforcing filler prepared when the ratio of graphene oxide, ultrashort jute silk, carboxymethyl cellulose and water in the modified graphene fiber is (1-1.5):1:0.2:3 is added into a concrete system to fully exert the reinforcing and anti-cracking effects, but the reinforcing filler cannot be used.
TABLE 8
Figure BDA0003365821330000131
According to the detection data of the embodiment 5 and the embodiments 8-10 in the table 8, it can be seen that when the polyethylene wax of 10kg and 15kg is added into the reinforcing filler in the embodiments 8 and 9, the values of the compressive strength and the splitting tensile strength of the concrete prepared in the embodiments 8 and 9 are similar to each other and are higher than those of the concrete prepared in the embodiment 5 without adding the polyethylene wax, and the compressive strength and the crack resistance of the concrete prepared in the embodiments 8 and 9 are improved to a certain extent; the inventor thinks that the polyethylene wax is beneficial to uniformly dispersing the wollastonite powder and the nano hydroxyapatite in the reinforcing filler, thereby being beneficial to fully combining the agglomerated wollastonite powder, the nano hydroxyapatite and the modified graphene fiber, further enhancing the structural performance of the complex with the interwoven net-shaped structure and enhancing the reinforcing anti-cracking function of the reinforcing filler.
When 20kg of polyethylene wax was added to example 10, the values of compressive strength and tensile strength at split were reduced in the concrete obtained in example 10 as compared with example 5, and the compressive strength and crack resistance were inferior in the concrete obtained in example 12. The addition of polyethylene wax in too much content can rather hinder the formation of complex compounds, thereby affecting the reinforcing and anti-cracking effects of the reinforcing filler.
TABLE 9
Figure BDA0003365821330000132
According to the test data of examples 5 and 11-13 in Table 9, it can be seen that the compressive strength and the tensile strength at the early stage and the late stage of the concrete prepared in examples 11-13 are higher than those of the concrete prepared in example 5 without adding alkylphenol ethoxylates in examples 11-13 by adding alkylphenol ethoxylates in examples 11-13, which indicates that the compressive strength and the cracking resistance of the concrete prepared in examples 11-13 are better.
The inventor believes that the alkylphenol ethoxylates can reduce the surface activity of the reinforcing filler system, so that a complex generated by the action of the system has strong permeability and can fully permeate into gaps of concrete, the complex is filled more fully and strictly, and the reinforcing anti-cracking effect of the reinforcing filler on the concrete is further enhanced.
Watch 10
Figure BDA0003365821330000141
As shown in the test data of example 5 and examples 14-16 in Table 10, the quick setting agents of examples 14 and 15 are prepared from triethanolamine, calcium aluminate, aluminum sulfate, sodium carbonate and water in a mass ratio of (2-4):1When the setting accelerators were prepared by mixing at a ratio of 1:2:3:20, the setting times of the concretes prepared in examples 14 and 15 were shorter and the setting accelerators of the concretes were higher than those of the concretes prepared by selecting the commercially available GH-405 type setting accelerator in example 5; the inventor believes that triethanolamine in the setting accelerator can remarkably reduce the surface tension of cement paste, enhance the combination of cement and the setting accelerator and HCOO in sodium carbonate-Permeate to C3S and C2Hydration layer of S, accelerated Ca (OH)2And decomposition of calcium silicate to OH in solution on the surface of cement particles-The concentration is rapidly reduced, and the unhydrated cement particles are promoted to be further decomposed, so that the formation of C-S-H gel is promoted; meanwhile, in the quick-setting agent A13+、SO4-With cement hydrates and C3Hydrated and dissolved Ca of S2+The rapid combination forms a large amount of ettringite, and a large amount of ettringite crystals are mutually staggered to form a network structure to coagulate the cement, thereby realizing the rapid setting early strength of the concrete.
The concrete prepared in examples 14 and 15 has the compressive strength of 6h and 1d which is obviously improved compared with the early compressive strength of example 5, but the increase trend of the compressive strength of 28d and 90d is reduced compared with the increase trend of the later strength of example 5, which shows that the concrete prepared in examples 14 and 15 has poor stability and increase of the later strength. The inventor believes that the reason is that the hydration of the cement is further accelerated by the quick-setting agent, so that the hydration heat is concentrated too much, and the internal and external pressure difference causes the increase of micro-cracks generated in the later period of the concrete, thereby reducing the strength of the concrete and inhibiting the reinforcing effect of the reinforcing filler on the concrete.
The setting accelerator of example 16, in which triethanolamine, calcium aluminate, aluminum sulfate, sodium carbonate and water were mixed in a mass ratio of 0.5:11:2:3:20, the setting time of the concrete obtained in example 16 was longer than that of the concrete obtained in examples 14 and 15, and the compressive strength of the concrete was also reduced compared with that of the concrete obtained in examples 14 and 15, indicating that the concrete obtained in example 16 had a reduced setting rate and reduced compressive strength, which the inventors thought was probably because the synergistic effect of the components of the setting accelerator was inhibited after the components exceeded a certain ratio, and the hydration acceleration effect of the cement was reduced.
TABLE 11
Figure BDA0003365821330000151
According to the detection data of the example 5 and the example 17 in the table 11, the concrete system of the example 17 adopts the quick setting agent prepared by mixing the triethanolamine, the calcium aluminate, the aluminum sulfate, the sodium carbonate and the water according to the mass ratio of 2:11:2:3: 20; the polyethylene wax of 10kg and the alkylphenol ethoxylates of 4kg are added, so that the setting time, the compressive strength and the tensile strength at cleavage of the concrete prepared in example 17 are remarkably improved compared with those of the concrete prepared in example 5, the influence of the quick-setting agent on the later strength of the concrete is reduced through the combined action of the components, and finally, the concrete prepared in example 17 has the properties of high early strength at rapid setting, high later strength and good crack resistance, and example 17 is the best example in the application.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. The utility model provides a high performance quick set early strength concrete which characterized in that: the concrete mixture is prepared from the following components in parts by weight:
138 portions and 158 portions of water;
cement 690 and 750 parts;
70-90 parts of silicon powder;
90-120 parts of slag;
600 portions of medium sand 560-;
848 regenerative aggregate and 888 parts;
13.8-15 parts of a water reducing agent;
20.7-22.5 parts of a quick-setting agent;
10-15 parts of slaked lime powder;
53-71 parts of epoxy resin;
47.5-57.5 parts of nano hydroxyapatite;
36-50 parts of modified graphene fiber;
40-50 parts of wollastonite powder;
the preparation method of the modified graphene fiber comprises the following steps:
s1: mixing graphene oxide, ultrashort jute silk, carboxymethyl cellulose and water, wherein the mass ratio of graphene fiber to ultrashort jute silk to carboxymethyl cellulose to water is (1-1.5) to 1:0.2:3, and uniformly stirring to obtain a fiber mixed solution;
s2: extruding the fiber mixed solution into a coagulating bath to obtain a gel-like modified graphene fiber;
s3: and washing and drying the gel-like modified graphene fiber to obtain the modified graphene fiber.
2. The high-performance quick-setting early-strength concrete according to claim 1, characterized in that: the concrete mixture comprises the following components in parts by weight:
143 portions of water and 153 portions of water;
cement 705 + 735 parts;
75-85 parts of silicon powder;
100 portions of slag and 110 portions of slag;
570-590 parts of medium sand;
878 portions of regenerated aggregate 858;
14.1-14.7 parts of a water reducing agent;
21.2-22.1 parts of a quick-setting agent;
12-13 parts of slaked lime powder;
59-65 parts of epoxy resin;
50.5-54.5 parts of nano hydroxyapatite;
40-46 parts of modified graphene fiber;
43-47 parts of wollastonite powder.
3. A high performance quick setting early strength concrete according to claim 1 or 2, characterized in that: the concrete mixture also comprises 10-15 parts by weight of polyethylene wax.
4. A high performance quick setting early strength concrete according to claim 1 or 2, characterized in that: the concrete mixture also comprises 3-5 parts by weight of alkylphenol polyoxyethylene.
5. A high performance quick setting early strength concrete according to claim 1 or 2, characterized in that: the quick-setting agent is prepared by mixing triethanolamine, calcium aluminate, aluminum sulfate, sodium carbonate and water according to the mass ratio of (2-4) to (11: 2:3: 20).
6. A high performance quick setting early strength concrete according to claim 1 or 2, characterized in that: the recycled aggregate is crushed stone with the particle size of 15-20 mm.
7. A high performance quick setting early strength concrete according to claim 1 or 2, characterized in that: the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent or a naphthalene water reducing agent.
8. A method of producing a high performance quick setting early strength concrete according to any one of claims 1, 2, 5, 6, 7, comprising the steps of:
mixing epoxy resin, nano hydroxyapatite, modified graphene fiber and wollastonite powder, and uniformly stirring at the temperature of 50-60 ℃ to obtain a reinforcing filler;
step two, mixing the water reducing agent and the quick setting agent, and uniformly stirring to obtain a mixed reagent for later use;
step three, mixing cement, silicon powder, slag, slaked lime powder, the reinforcing filler prepared in the step one, the mixed reagent prepared in the step two and water, and uniformly stirring to obtain cement slurry;
adding the medium sand and the recycled aggregate into the cement slurry, mixing, and uniformly stirring to obtain a concrete mixture;
and step five, standing and curing the concrete mixture to obtain the high-performance quick-setting early-strength concrete.
9. The method for preparing high-performance quick-setting early-strength concrete according to claim 8, wherein the method comprises the following steps: and 10-15 parts of polyethylene wax is also added in the first step.
10. The method for preparing high-performance quick-setting early-strength concrete according to claim 8, wherein the method comprises the following steps: mixing the reinforcing filler and 3-5 parts by weight of alkylphenol polyoxyethylene ether, and uniformly stirring to obtain a mixture; and then mixing the mixture with cement, silicon powder, slag, hydrated lime powder, the mixed reagent prepared in the step two and water, and uniformly stirring to obtain cement slurry.
CN202111381603.7A 2021-11-22 2021-11-22 High-performance quick-setting early-strength concrete and preparation method thereof Withdrawn CN114105556A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115073085A (en) * 2022-06-10 2022-09-20 厦门海投建材有限公司 Fair-faced concrete and production process thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115073085A (en) * 2022-06-10 2022-09-20 厦门海投建材有限公司 Fair-faced concrete and production process thereof

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