CN117125931A - Low-viscosity high-strength concrete and preparation method thereof - Google Patents
Low-viscosity high-strength concrete and preparation method thereof Download PDFInfo
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- 239000011372 high-strength concrete Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- 239000002245 particle Substances 0.000 claims abstract description 40
- 239000000839 emulsion Substances 0.000 claims abstract description 34
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 31
- 239000004568 cement Substances 0.000 claims abstract description 20
- 239000000843 powder Substances 0.000 claims abstract description 18
- HDERJYVLTPVNRI-UHFFFAOYSA-N ethene;ethenyl acetate Chemical group C=C.CC(=O)OC=C HDERJYVLTPVNRI-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229920001038 ethylene copolymer Polymers 0.000 claims abstract description 17
- 239000011347 resin Substances 0.000 claims abstract description 17
- 229920005989 resin Polymers 0.000 claims abstract description 17
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims abstract description 17
- 239000000835 fiber Substances 0.000 claims abstract description 15
- 239000004743 Polypropylene Substances 0.000 claims abstract description 14
- -1 polypropylene Polymers 0.000 claims abstract description 14
- 229920001155 polypropylene Polymers 0.000 claims abstract description 14
- 230000002745 absorbent Effects 0.000 claims abstract description 11
- 239000002250 absorbent Substances 0.000 claims abstract description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 11
- 239000011325 microbead Substances 0.000 claims abstract description 11
- 239000011707 mineral Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 239000004579 marble Substances 0.000 claims description 22
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 17
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 16
- NVVZQXQBYZPMLJ-UHFFFAOYSA-N formaldehyde;naphthalene-1-sulfonic acid Chemical compound O=C.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 NVVZQXQBYZPMLJ-UHFFFAOYSA-N 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 13
- 239000002253 acid Substances 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 6
- 239000010881 fly ash Substances 0.000 claims description 4
- 150000001408 amides Chemical class 0.000 claims description 3
- 150000003951 lactams Chemical class 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims 1
- 239000004567 concrete Substances 0.000 abstract description 61
- 230000001603 reducing effect Effects 0.000 abstract description 9
- 230000003993 interaction Effects 0.000 abstract description 6
- 230000000052 comparative effect Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 239000004570 mortar (masonry) Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- 229920005646 polycarboxylate Polymers 0.000 description 7
- 230000009471 action Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000008030 superplasticizer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000017 hydrogel Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920000867 polyelectrolyte Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
- C04B16/0633—Polypropylene
-
- 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
- C04B24/16—Sulfur-containing compounds
- C04B24/20—Sulfonated aromatic compounds
- C04B24/22—Condensation or polymerisation products thereof
- C04B24/226—Sulfonated naphtalene-formaldehyde condensation products
-
- 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
-
- 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
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
-
- 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
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
- C04B24/42—Organo-silicon compounds
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The application belongs to the technical field of civil engineering, and particularly relates to low-viscosity high-strength concrete and a preparation method thereof. The low-viscosity high-strength concrete comprises the following preparation raw materials in terms of per cubic meter: 120-130kg of water, 200-240kg of cement, 800-900kg of fine aggregate, 900-1000kg of coarse aggregate, 120-150kg of microbeads, 15-20kg of water reducer, 110-140kg of mineral powder, 50-80kg of polypropylene fiber, 8-12kg of super absorbent resin, 2-3kg of vinyl acetate-ethylene copolymer emulsion and 3-5kg of organosilicon modified styrene-acrylic emulsion. The application reduces the interaction force among the particles of the concrete, and improves the thickness of the water film layer among the particles, thereby reducing the viscosity of the concrete, and improving the compactness of the concrete, thereby improving the compressive strength of the concrete.
Description
Technical Field
The application belongs to the technical field of civil engineering, and particularly relates to low-viscosity high-strength concrete and a preparation method thereof.
Background
With the continuous expansion of civil engineering scale and the continuous improvement of technology level, the continuous appearance of important buildings with high-rise and large spans and special function requirements, the requirement that concrete has higher strength, better durability and better stability, and the requirement that the concrete is developed to high performance and even ultra-high performance. The improvement of the strength of the concrete is mainly realized by reducing the water-cement ratio, but the viscosity of the concrete is increased, a series of construction problems such as concrete stirring, transportation, pumping and the like are caused, and the popularization and application of the high-strength and ultra-high-strength concrete are greatly limited. Therefore, how to reduce the viscosity of concrete becomes a key problem for the development of high-strength and ultra-high-strength concrete.
The application patent with publication number of CN104844099A discloses a low-shrinkage low-viscosity ultra-high strength concrete, which comprises the following components in percentage by weight: 250-300 kg of cement, 120-180 kg of microbeads, 90-120 kg of mineral powder, 820-860 kg of machine-made sand, 950-1000 kg of broken stone, 7-11 kg of water reducer and 115-125 kg of water, and solves the problems of difficult pumping caused by shrinkage cracking and overlarge viscosity of ultra-high strength concrete.
However, the inventors found that the viscosity of the concrete corresponding to the mortar with the same proportion is 20.9-27.8 Pa.s, and the viscosity reduction effect of the concrete is not obvious.
Disclosure of Invention
The application provides low-viscosity high-strength concrete and a preparation method thereof in order to improve the viscosity reduction effect of high-strength concrete.
In a first aspect, the application provides a low-viscosity high-strength concrete and a preparation method thereof, and the preparation method is realized by adopting the following technical scheme:
the low-viscosity high-strength concrete comprises the following preparation raw materials in terms of per cubic meter: 120-130kg of water, 200-240kg of cement, 800-900kg of fine aggregate, 900-1000kg of coarse aggregate, 120-150kg of microbeads, 15-20kg of water reducer, 110-140kg of mineral powder, 50-80kg of polypropylene fiber, 8-12kg of super absorbent resin, 2-3kg of vinyl acetate-ethylene copolymer emulsion and 3-5kg of organosilicon modified styrene-acrylic emulsion.
By adopting the technical scheme, the combined action of the vinyl acetate-ethylene copolymer emulsion and the organosilicon modified styrene-acrylic emulsion not only reduces the interaction force among the particles of the concrete and improves the thickness of a water film layer among the particles in the concrete, thereby obviously reducing the viscosity of the concrete, but also improving the compactness of the concrete and reducing the harmful capillary holes of the concrete, and further improving the compressive strength of the concrete.
The super absorbent resin is a polyelectrolyte containing hydrophilic groups and a cross-linking structure, and before water absorption, the polymer chains of the super absorbent resin are mutually wound together and cross-linked into a net structure, and when the super absorbent resin contacts with water, water molecules permeate into the super absorbent resin through capillary action and diffusion action to form hydrogel. The water-absorbing resin and the water reducing agent have double functions, so that the water demand of the cement paste is effectively reduced, and the viscosity of the concrete is reduced.
The polypropylene fibers can be randomly distributed in the concrete to form a layer-by-layer nested net structure, so that the concrete has the function of fine reinforcement and can effectively improve the compressive strength of the concrete.
Preferably, the mass ratio of the vinyl acetate-ethylene copolymer emulsion to the organosilicon modified styrene-acrylic emulsion is 1:2.
By adopting the technical scheme, the interaction force among the particles of the concrete is stronger, and the thickness of the water film layer among the particles in the concrete is larger, so that the viscosity of the concrete is obviously reduced.
Preferably, the Gao Xishui resin is prepared by mixing sodium polyacrylate and polydodecyl amide according to the mass ratio of 1 (0.3-0.5).
By adopting the technical scheme, the high water-absorbing resin compounded by the sodium polyacrylate and the polydodecyl lactam can further reduce the water demand of the cement paste, thereby reducing the viscosity of the concrete, improving the dispersibility of the polypropylene fibers in the mortar concrete, improving the binding force of the polypropylene fibers and the mortar concrete matrix, and further improving the compressive strength of the concrete.
Preferably, the mass ratio of the sodium polyacrylate to the polydodecyl amide is 1:0.4.
By adopting the technical scheme, the water demand of the cement paste is less, the viscosity of the concrete is lower, and the compressive strength of the concrete is higher.
Preferably, the water reducer is prepared by mixing naphthalene sulfonate formaldehyde condensate and a polycarboxylic acid water reducer according to a mass ratio of (0.5-0.7): 1.
Through adopting above-mentioned technical scheme, naphthalene sulfonate formaldehyde condensate and polycarboxylate water reducer complex's water reducer has the absorption stack effect, makes the water reducer adsorb on cement particle surface, reduces the interact power between the cement particle, increases the thickness of water film layer to help reducing concrete viscosity.
Preferably, the mass ratio of the naphthalene sulfonate formaldehyde condensate to the polycarboxylic acid water reducer is 0.6:1.
By adopting the technical scheme, the viscosity of the concrete is lower.
Preferably, the microbeads are fully spherical superfine fly ash with bulk density of 800-1000kg/m 3 Laser particle size parameter D 50 ≤2μm。
By adopting the technical proposal, the full spherical superfine fly ash has the bulk density of 800-1000kg/m 3 Laser particle size parameter D 50 The microbeads with the particle size less than or equal to 2 mu m have obvious morphological effect, activity effect and micro aggregate effect, and have obvious water reducing, viscosity reducing and reinforcing effects in concrete.
Preferably, the specific surface area of the mineral powder is more than or equal to 750m 2 /kg, laser particle size parameter D 50 ≤10μm。
By adopting the technical scheme, the specific surface area is more than or equal to 750m 2 /kg, laser particle size parameter D 50 Mineral powder less than or equal to 10 mu m has the functions of high activity, early strength, improvement of mechanical properties of concrete and the like, and can obviously improve the compressive strength and durability of the concrete.
Preferably, the coarse aggregate is formed by mixing marble with the particle size of 11-15mm, 16-20mm, 21-25mm, 26-30mm and 31-35mm according to the mass ratio of 5:10:25:30:30.
Through adopting above-mentioned technical scheme, a plurality of particle size grades, the difference of every grade is 4mm, and the marble quantity of great particle size grade is more than the marble of less particle size grade, make the marble of little particle size play the effect of filling the clearance between the marble of great particle size, make the marble in the concrete play furthest bearing effect, because clearance between the marble diminishes, consequently, the use amount of cement has been reduced, the cost is saved, and the flaky marble that gets rid of all pulverizes into marble powder, in the production of rostone, consequently, carry out effective utilization to the production clout, greatly reduced the quantity of dust and discarded object in the production process of this concrete, resource and energy utilization efficiency have been improved, the production of harmful substance has been reduced.
In a second aspect, the application provides a preparation method of low-viscosity high-strength concrete, which is realized by adopting the following technical scheme: a preparation method of low-viscosity high-strength concrete comprises the following steps:
mixing the water reducer, vinyl acetate-ethylene copolymer emulsion, organic silicon modified styrene-acrylic emulsion and water, and uniformly stirring to obtain an additive;
mixing the microbeads, mineral powder, polypropylene fibers and super absorbent resin, uniformly stirring, adding the fine aggregate, the coarse aggregate and cement, and uniformly stirring to obtain powder;
and under the stirring condition, adding the additive into the powder, and stirring uniformly to obtain the low-viscosity high-strength concrete.
In summary, the application has the following beneficial effects:
1. according to the application, through the combined action of the vinyl acetate-ethylene copolymer emulsion and the organosilicon modified styrene-acrylic emulsion, the interaction force among particles of the concrete is reduced, the thickness of a water film layer among the particles in the concrete is increased, so that the viscosity of the concrete is obviously reduced, the compactness of the concrete is also improved, and the harmful capillary holes of the concrete are reduced, so that the compressive strength of the concrete is improved.
2. According to the application, the water demand of the cement paste is effectively reduced by the dual functions of the super absorbent resin and the water reducer, so that the viscosity of the concrete is reduced.
3. According to the application, polypropylene fibers can be randomly distributed in concrete to form a layer-by-layer nested net structure, so that the concrete has the function of fine reinforcement, and the compressive strength of the concrete can be effectively improved.
4. According to the application, the water demand of the cement paste can be further reduced by the high water absorption resin compounded by the sodium polyacrylate and the polydodecyl lactam, so that the viscosity of the concrete is reduced, the dispersibility of the polypropylene fibers in the mortar concrete is improved, the binding force of the polypropylene fibers and the mortar concrete matrix is improved, and the compressive strength of the concrete is improved.
5. According to the water reducer compounded by the naphthalene sulfonate formaldehyde condensate and the polycarboxylic acid water reducer, the water reducer has an adsorption superposition effect, so that the water reducer is adsorbed on the surface of cement particles, the interaction force between the cement particles is reduced, the thickness of a water film layer is increased, and the reduction of the viscosity of concrete is facilitated.
Detailed Description
The present application will be described in further detail with reference to examples.
Preparation example
Preparation example 1 provides a coarse aggregate, which is prepared by the following steps:
the method comprises the steps of crushing natural cubic marble with rough surface and no dust, removing flaky marble, screening marble with particle size of 11-15mm, marble with particle size of 16-20mm, marble with particle size of 21-25mm, marble with particle size of 26-30mm, marble with particle size of 31-35mm, and mixing marble with particle size of 11-15mm, marble with particle size of 16-20mm, marble with particle size of 21-25mm, marble with particle size of 26-30mm and marble with particle size of 31-35mm according to a mass ratio of 5:10:25:30:30 to obtain coarse aggregate.
Examples
Examples 1-13 provide a low viscosity high strength concrete, as exemplified by example 1 below.
The preparation method of the low-viscosity high-strength concrete provided in the embodiment 1 comprises the following steps:
s1, mixing 15kg of a Pasteur polycarboxylic acid water reducer RHEOPLUS 416, 2kg of vinyl acetate-ethylene copolymer emulsion, 3kg of organosilicon modified styrene-acrylic emulsion and 120kg of water, and uniformly stirring to obtain an additive;
s2, mixing 120kg of microbeads, 110kg of mineral powder, 50kg of polypropylene fibers and 8kg of sodium polyacrylate, uniformly stirring, adding 800kg of fine aggregate, 900kg of coarse aggregate and 200kg of strength grade 52.5 II type silicate cement, and uniformly stirring to obtain powder;
s3, adding the additive prepared in the step S1 into the powder prepared in the step S2 under the stirring condition, and uniformly stirring to obtain low-viscosity high-strength concrete;
wherein, the vinyl acetate-ethylene copolymer emulsion is model BJ-707, purchased from Henan Bafos chemical products Co., ltd;
the organosilicon modified styrene-acrylic emulsion is of the model AP-999A, and is purchased from Anhui Anping building materials Co., ltd;
the microbeads are fully spherical superfine fly ash with the bulk density of 800-1000kg/m 3 Laser particle size parameter D 50 ≤2μm；
The specific surface area of mineral powder is more than or equal to 750m 2 /kg, laser particle size parameter D 50 ≤10μm；
Polypropylene fiber with a fiber diameter of 18-45 μm, model HY-426, available from Shandong Hongyao copper Co., ltd;
sodium polyacrylate, model H-105, available from new materials for reel-off science and technology (Shanghai);
the fine aggregate is clean sand with fineness modulus of 2.5 and water content of 4%;
the coarse aggregate was derived from preparation example 1.
Examples 2 to 5 differ from example 1 only in that: the quality of each preparation raw material is different, and the specific table is shown in table 1.
TABLE 1 mass of each preparation raw material of examples 1 to 5
Example 6 differs from example 5 only in that: the equivalent mass of the Pasteur polycarboxylate water reducer RHEOPLUS 416 is replaced by naphthalene sulfonate formaldehyde condensate SNF-C (purchased from Hubei Aijingsu chemical Co., ltd.).
Example 7 differs from example 5 only in that: the equal mass of the bafsv polycarboxylate water reducer RHEOPLUS 416 is replaced by a mixture of naphthalene sulfonate formaldehyde condensate SNF-C and the bafsv polycarboxylate water reducer RHEOPLUS 416, and the mass ratio of the naphthalene sulfonate formaldehyde condensate SNF-C to the bafsv polycarboxylate water reducer RHEOPLUS 416 is 0.5:1.
Example 8 differs from example 7 only in that: the mass ratio of the naphthalene sulfonate formaldehyde condensate SNF-C to the Pasteur polycarboxylate superplasticizer RHEOPLUS 416 is 0.7:1.
Example 9 differs from example 7 only in that: the mass ratio of the naphthalene sulfonate formaldehyde condensate SNF-C to the Pasteur polycarboxylate superplasticizer RHEOPLUS 416 is 0.6:1.
Example 10 differs from example 9 only in that: the sodium polyacrylate is replaced by polydodeolactam (model 3030U, available from Chemie materials technology Co., ltd.) in Dongguan.
Example 11 differs from example 9 only in that: the equal mass of the sodium polyacrylate is replaced by a mixture of sodium polyacrylate H-105 and polydodecyl 3030U, and the mass ratio of the sodium polyacrylate H-105 to the polydodecyl 3030U is 1:0.3.
Example 12 differs from example 11 only in that: the mass ratio of the sodium polyacrylate H-105 to the polydodecyl 3030U is 1:0.5.
Example 13 differs from example 11 only in that: the mass ratio of the sodium polyacrylate H-105 to the polydodecyl 3030U is 1:0.4.
Comparative example
Comparative example 1 differs from example 1 only in that: the equal mass of the vinyl acetate-ethylene copolymer emulsion is replaced by organosilicon modified styrene-acrylic emulsion AP-999A.
Comparative example 2 differs from example 1 only in that: the organosilicon modified styrene-acrylic emulsion is replaced by vinyl acetate-ethylene copolymer emulsion BJ-707.
Comparative example 3 differs from example 1 only in that: no vinyl acetate-ethylene copolymer emulsion or organosilicon modified styrene-acrylic emulsion is added.
Comparative example 4 differs from example 1 only in that: sodium polyacrylate is not added.
Performance test
The following performance tests were conducted on the low-viscosity high-strength concrete prepared in examples 1 to 13 and comparative examples 1 to 4 of the present application.
1. Mortar viscosity: the viscosities of the corresponding mortars of the low-viscosity high-strength concrete of examples 1 to 13 and comparative examples 1 to 4 according to the standard JGJ/T70-2009 basic performance test method for building mortars were measured respectively, and the test results are shown in Table 2.
2. Compressive strength: 1 cubic meter of concrete is taken, 28d compressive strength is tested according to GBJ82-85 test method for long-term performance and durability of common concrete, and the test results are shown in Table 2.
Table 2 test results
The present application will be described in detail with reference to the test data shown in Table 2.
From the test data of example 1 and comparative examples 1 to 3, it is understood that comparative example 1 uses only the silicone-modified styrene-acrylic emulsion, comparative example 2 uses only the vinyl acetate-ethylene copolymer emulsion, comparative example 3 does not add the vinyl acetate-ethylene copolymer emulsion and the silicone-modified styrene-acrylic emulsion, and example 1 uses the vinyl acetate-ethylene copolymer emulsion and the silicone-modified styrene-acrylic emulsion to compound, and the viscosity of the concrete is lower and the 28d compressive strength is higher than that of example 1.
From the test data of example 1 and comparative example 4, it is understood that the addition of the super absorbent resin sodium polyacrylate of example 1 reduces the water demand of the cement paste, thereby reducing the viscosity of the concrete.
From the test data of examples 5 to 7, it is known that in example 7, the water reducer compounded by naphthalene sulfonate formaldehyde condensate SNF-C and basf polycarboxylic acid water reducer RHEOPLUS 416 is adopted, so that the viscosity of concrete is remarkably reduced, and the water reducer compounded by naphthalene sulfonate formaldehyde condensate and polycarboxylic acid water reducer has an adsorption superposition effect, so that the water reducer is adsorbed on the surface of cement particles, the interaction force between the cement particles is reduced, and the thickness of a water film layer is increased.
From the test data of examples 9-11, the high water-absorbing resin compounded by the sodium polyacrylate H-105 and the polydodecyl 3030U is adopted in example 11, so that the viscosity of the concrete is reduced, and the binding force between the polypropylene fiber and a mortar concrete matrix is improved, thereby improving the 28d compressive strength of the concrete.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (10)
1. The low-viscosity high-strength concrete is characterized by comprising the following preparation raw materials in terms of per cubic meter: 120-130kg of water, 200-240kg of cement, 800-900kg of fine aggregate, 900-1000kg of coarse aggregate, 120-150kg of microbeads, 15-20kg of water reducer, 110-140kg of mineral powder, 50-80kg of polypropylene fiber, 8-12kg of super absorbent resin, 2-3kg of vinyl acetate-ethylene copolymer emulsion and 3-5kg of organosilicon modified styrene-acrylic emulsion.
2. The low viscosity, high strength concrete according to claim 1, wherein the mass ratio of the vinyl acetate-ethylene copolymer emulsion to the silicone modified styrene-acrylic emulsion is 1:2.
3. The low-viscosity high-strength concrete according to claim 1, wherein the Gao Xishui resin is prepared by mixing sodium polyacrylate and polydodecyl lactam according to a mass ratio of 1 (0.3-0.5).
4. A low viscosity, high strength concrete according to claim 3, wherein the mass ratio of sodium polyacrylate to polydodecyl amide is 1:0.4.
5. The low-viscosity high-strength concrete according to claim 1, wherein the water reducer is formed by mixing naphthalene sulfonate formaldehyde condensate and a polycarboxylic acid water reducer according to a mass ratio of (0.5-0.7): 1.
6. The low-viscosity high-strength concrete according to claim 5, wherein the mass ratio of naphthalene sulfonate formaldehyde condensate to polycarboxylate-type water reducing agent is 0.6:1.
7. The low viscosity high strength concrete according to claim 1, wherein said microbeads are fully spherical ultrafine fly ash having a bulk density of 800-1000kg/m 3 Laser particle size parameter D 50 ≤2μm。
8. The low-viscosity high-strength concrete according to claim 1, wherein the specific surface area of the mineral powder is more than or equal to 750m 2 /kg, laser particle size parameter D 50 ≤10μm。
9. The low-viscosity high-strength concrete according to claim 1, wherein the coarse aggregate is formed by mixing marble with a particle size of 11-15mm, 16-20mm, 21-25mm, 26-30mm and 31-35mm according to a mass ratio of 5:10:25:30:30.
10. A method for preparing the low-viscosity high-strength concrete according to any one of claims 1 to 9, comprising the steps of:
mixing the water reducer, vinyl acetate-ethylene copolymer emulsion, organic silicon modified styrene-acrylic emulsion and water, and uniformly stirring to obtain an additive;
mixing the microbeads, mineral powder, polypropylene fibers and super absorbent resin, uniformly stirring, adding the fine aggregate, the coarse aggregate and cement, and uniformly stirring to obtain powder;
and under the stirring condition, adding the additive into the powder, and stirring uniformly to obtain the low-viscosity high-strength concrete.
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Address after: 215000 Xinhe village, Tongan town, high tech Zone, Suzhou City, Jiangsu Province Applicant after: East China Materials Suzhou Co.,Ltd. Address before: 215000 Xinhe village, Tongan town, high tech Zone, Suzhou City, Jiangsu Province Applicant before: Suzhou Nanfang Concrete Co.,Ltd. |