CN111548070B - Reinforced compact anticorrosive sprayed concrete - Google Patents

Reinforced compact anticorrosive sprayed concrete Download PDF

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CN111548070B
CN111548070B CN202010430550.2A CN202010430550A CN111548070B CN 111548070 B CN111548070 B CN 111548070B CN 202010430550 A CN202010430550 A CN 202010430550A CN 111548070 B CN111548070 B CN 111548070B
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modified nano
concrete
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CN111548070A (en
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向敏
刘世杰
李享涛
李忠
袁善文
白小可
李锋刚
孙涛
周杰
杨经伟
李康
刘志韬
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China Railway Erju 2nd Engineering Co Ltd
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China Railway Erju 2nd Engineering Co Ltd
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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
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • 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

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

Abstract

The invention relates to the field of high-performance concrete, and discloses reinforced compact anticorrosive sprayed concrete which comprises the following components in parts by weight: 400 portions of cement, 100 portions of reinforcing admixture, 150 portions of sand, 900 portions of sand, 850 portions of gravel, 5-10 portions of water reducing agent, 1-5 portions of air entraining agent, 50-70 portions of preservative, 20-40 portions of accelerating agent and 150 portions of water; the reinforcing admixture comprises: 20-30 parts of silica fume, 20-30 parts of fly ash, 10-20 parts of modified nano material and 5-10 parts of nano carbon fiber. The sprayed concrete provided by the invention has better seepage resistance, crack resistance, compactness and durability, better cohesiveness with rocks and higher early strength, and can achieve the aim of safe and rapid support.

Description

Reinforced compact anticorrosive sprayed concrete
Technical Field
The invention relates to the technical field of high-performance concrete, in particular to reinforced compact anticorrosive sprayed concrete.
Background
The high-salinity stratum comprises a high-chloride stratum and a high-sulfate stratum, and the high-chloride stratum has the characteristics of high solubility, strong corrosivity and expansibility due to the extremely high NaCl content, even as high as 80 percent. When the railway tunnel construction is carried out on a high salt rock bottom layer, the following problems can be caused: (1) the steel bar in the steel structure concrete is easy to be mixed with Cl in NaCl solution-The reaction is carried out, the steel bar is corroded, the performance of the steel bar is weakened, and the volume of the generated rust substance is larger than that of the original steel bar, so that the cracks of the concrete are further expanded; (2) the NaCl solution is possibly recrystallized to generate volume expansion when penetrating into concrete cracks, and the cracking of a concrete structure is also aggravated; (3) the salt rock stratum is continuously dissolved, so that the stress of the tunnel structure is changed, and the foundation is caused to sink and deform. These detrimental effects lead to severe damage to the reinforced concrete structure, which can exacerbate the damage process if groundwater is continuously drained or in a frequent wet-dry alternate environment, and the resulting structure endangers the safety of driving. Therefore, the activity of the high-salinity rock bottom layer underground water is prevented, the damage to the structural performance caused by the saline underground water entering the structure is avoided, and the key to be mastered in the construction of the railway tunnel is provided.
The sprayed concrete is formed by filling cement, sand, pebbles, water and a certain amount of additives which are prepared in advance into a sprayer, sending the mixture to a sprayer by utilizing high-pressure air, mixing the mixture with an accelerating agent and spraying the mixture to the surface of rock or concrete at a high speed.
In the railway tunnel construction process, the sprayed concrete is the best support measure for surface contact with surrounding rocks, and is also a second defense line for blocking underground water besides grouting and water stopping, and the primary sprayed concrete closely follows the tunnel face, so that microcracks are generated due to blasting influence and the impermeability of the primary sprayed concrete is greatly influenced. Therefore, the performance requirements of the shotcrete for high-salt rock tunnel construction need to have good fluidity, high early strength and other properties, and also need to have good impermeability and crack resistance, so as to prevent saline groundwater from entering the structure to damage the structural performance, and even influence later construction.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the reinforced compact anticorrosive sprayed concrete, which can improve the compactness and the corrosion resistance of the sprayed concrete under the conditions of good fluidity and high early strength of the sprayed concrete, thereby increasing the impermeability and the crack resistance of the sprayed concrete, and preventing the influence of the permeation of underground water on the structural performance and the later construction.
In order to achieve the above purpose, the solution adopted by the invention is as follows:
the reinforced compact anticorrosive sprayed concrete comprises the following components in parts by weight:
400 portions of cement, 100 portions of reinforcing admixture, 150 portions of sand, 900 portions of sand, 850 portions of gravel, 5-10 portions of water reducing agent, 1-5 portions of air entraining agent, 50-70 portions of preservative, 20-40 portions of accelerating agent and 150 portions of water; the reinforcing admixture comprises: 20-30 parts of silica fume, 20-30 parts of fly ash, 10-20 parts of modified nano material and 5-10 parts of nano carbon fiber; the modified nano material comprises modified nano CaCO3And modified nano TiO2。
The invention has the beneficial effects that:
1. according to the shotcrete provided by the invention, the reinforcing admixture is introduced on the basis of the traditional concrete, and the nano carbon fiber and the modified nano material are mainly introduced; the nano materials have extremely small size, can be quickly filled in gaps of concrete, increase the bulk density of slurry materials, reduce the void ratio, enable the concrete to be more compact, relieve the early chlorine ion permeation of the concrete, and effectively improve the impermeability of the concrete.
2. The nano carbon fibers introduced into the sprayed concrete are longitudinally and transversely interwoven in hydration products of the concrete and are mutually overlapped to form a solid net structure, so that the integrity of the concrete can be improved; the carbon nanofibers are distributed in the C-S-H gel, and fiber monofilaments are wrapped by C-S-H gel particles, so that the effect of a molecular chain is achieved, the toughness and the integrity of gel are enhanced, and the crack resistance of concrete is improved; in addition, the nano carbon fiber can bridge micro gaps and micro cracks in the concrete, effectively prevent the further development of the micro cracks and further promote the anti-cracking performance of the concrete.
3. The invention is innovative to nano TiO2And nano CaCO3Modified, can effectively avoid nanometer TiO in the process of mixing with water2And nano CaCO3The cement is combined with a large number of water molecules, so that the hydration degree of the cement is more thorough, the compressive strength and the elastic modulus of the concrete are improved, and the weather resistance and the dispersity of the concrete are greatly improved; meanwhile, the modified nano material is more uniformly dispersed when being blended with a matrix, so that the compactness of a concrete structure is better improved, the diffusion of chlorine ions and the erosion of chlorine salt and sulfate are better prevented, the compactness of sprayed concrete is improved, and the impermeability and the corrosion resistance of the concrete are improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The reinforced dense anticorrosive shotcrete provided by the embodiment of the invention is specifically described below.
The reinforced compact anticorrosive sprayed concrete comprises the following components in parts by weight: 400 portions of cement, 100 portions of reinforcing admixture, 150 portions of sand, 900 portions of sand, 850 portions of gravel, 5-10 portions of water reducing agent, 1-5 portions of air entraining agent, 50-70 portions of preservative, 20-40 portions of accelerating agent and 150 portions of water; the reinforcing admixture comprises: 20-30 parts of silica fume, 20-30 parts of fly ash, 10-20 parts of modified nano material and 5-10 parts of nano carbon fiber; the modified nano material comprises modified nano CaCO3And modified nano TiO2Modified nano CaCO3: modified nano TiO2＝1:0.5～2。
Preferably, the reinforced dense anticorrosive shotcrete comprises the following components in parts by weight: 400 parts of cement 350-containing material, 130 parts of reinforcing admixture 100-containing material, 850 parts of sand 800-containing material, 800 parts of gravel 750-containing material, 7-10 parts of water reducing agent, 1-3 parts of air entraining agent, 50-60 parts of preservative, 20-30 parts of accelerating agent and 130 parts of water 100-containing material; the reinforcing admixture comprises: 20-25 parts of silica fume, 20-25 parts of fly ash, 10-15 parts of modified nano material and 7-10 parts of nano carbon fiber; the modified nano material comprises modified nano CaCO3And modified nano TiO2Modified nano CaCO3: modified nano TiO2＝1:1～1.2。
The silica fume and the fly ash can fill the pores in the concrete due to smaller particle size, so that the pore diameter of the large pores of the concrete is reduced, the strength and the compactness of the concrete are further improved, and particularly under severe environments such as chloride pollution erosion, sulfate erosion, high humidity and the like, the durability of the sprayed concrete can be improved by one time or even several times, the alkali aggregate reaction can be effectively inhibited, and the rebound rate of the sprayed concrete is reduced; meanwhile, with the increase of the mixing amount of the fly ash and the silica fume, the internal pore structure of the slurry is gradually refined, the porosity tortuosity is increased, the permeability is reduced, and the impermeability of the concrete is improved, but the activity of the fly ash generally needs to be excited for one month or more, which is the 'energy reserve' for the continuous increase of the strength of the sprayed concrete in the later period (after 28 d).
According to the invention, the nano carbon fibers are innovatively introduced into the concrete, and because the nano carbon fiber particles have high surface activity, the hydration of cement can be accelerated when the nano carbon fiber particles are doped into the concrete, so that the sprayed concrete is quickly condensed, the early strength is improved, and the primary support of rocks is realized; and due to the crystal nucleus effect and the adsorption effect of the carbon nanofibers, the hydration products gradually form a network structure taking the nanoparticles as the core, and the structure is favorable for improving the mechanical property of the concrete; meanwhile, the formation of large crystals is inhibited, and the orientation degree of the crystals is reduced, so that the interface structure of the set cement and the aggregate is improved, the bonding strength between the set cement and the aggregate is further improved, the compressive strength of concrete is improved, and the early-stage support protection is facilitated. Meanwhile, the molecular chain effect of the carbon nanofibers strengthens the relation among the components in the system, enhances the integrity of the concrete, further improves the strength of the concrete, and along with the continuous damage of the concrete under the external acting force, the microcracks gradually expand, the tensile stress of the carbon nanofibers in the crack development process gradually increases, the constraint of the cement paste is finally broken away, and partial fracture destructive power is consumed, so that the inhibition effect on the concrete microcracks is achieved.
Nano CaCO3And nano TiO2The particles are fine, and the nano CaCO is promoted in the process that the nano carbon fibers accelerate the hydration of cement3And nano TiO2The particles are alternately and quickly filled in gaps of concrete, so that the bulk density of slurry materials is increased, the void ratio is reduced, the concrete is more compact, and the early chlorine ion permeation of the concrete is relieved, thereby improving the compressive strength; but due to nano CaCO3And nano TiO2The nano CaCO has large specific surface area, strong surface polarity, easy agglomeration, poor compatibility with most of substrates, low dispersion uniformity when being blended with the substrates and influence on the compactness of a concrete structure, so the nano CaCO is used for preparing the material3And nano TiO2The modification is carried out, and the modification method comprises the following steps: (1) dropwise adding 1mol/L sodium hydroxide solution and 0.1mol/L aluminum sulfate solution into titanium dioxide or calcium carbonate dispersion liquid under the stirring state, wherein the mass of the sodium hydroxide solution is 10% of that of the nano material, the mass of the aluminum sulfate solution is 5% of that of the nano material, and the PH is kept between 10 and 11; after the completion of the dropwise addition, the solution was adjusted to pH 7 with 0.5mol/L dilute sulfuric acid and aged for 4 hours while maintaining the temperature to ensure A12O3Densifying, filtering, washing the filter cake, drying at 120-140 deg.C, and grinding to obtain A12O3Coated nano TiO2Or A12O3Coated nano CaCO3(ii) a (2) The inorganic modified nano TiO is2Or nano CaCO3Adding water, regulating pH to 2, ultrasonic treating, and mixing with the treated nanometer TiO2Or nano CaCO3Pouring the solution into a 1mol/L solution of sodium dodecyl sulfate with the mass ratio of 1:2, stirring, reacting for 4 hours, filtering, drying in vacuum, and grinding to obtain the modified sodiumTiO rice2Or modified nano CaCO3。
The titanium dioxide or calcium carbonate treated by aluminum salt has a large amount of positive charges on the surface, and then is organically modified, can improve the weather resistance and the dispersibility, the sodium dodecyl sulfate is an anionic surfactant, one end of the sodium dodecyl sulfate is a hydrophilic group with negative charges, and the other end of the sodium dodecyl sulfate is a hydrophobic group consisting of alkyl chains, so that the hydrophilic group with the negative charges of the sodium dodecyl sulfate is adsorbed to the surface of titanium dioxide or calcium carbonate with positive charges on the surface under the action of van der Waals force, one end of the hydrophobic group is regularly arranged outside the titanium dioxide or the calcium carbonate, so that the surface of the titanium dioxide or the calcium carbonate has hydrophobicity, the cement can be effectively prevented from being combined with a large number of water molecules in the process of mixing with water, so that the hydration effect of the cement is not influenced, the hydration degree of the cement is more thorough, the compressive strength and the elastic modulus of the concrete are improved, and the weather resistance of the concrete is greatly improved; the modified nano material has better dispersibility, so that the modified nano material is more uniformly dispersed when being blended with a matrix, the compactness of a concrete structure is improved, the chlorine ion diffusion resistance, the sulfate corrosion resistance and the like are better, the compactness of the sprayed concrete is improved, and the impermeability and the corrosion resistance of the concrete are promoted to be improved.
In addition, modified nano CaCO3Can also be mixed with Ca (OH) in sandstone2The C-S-H gel is generated by the reaction, the carbon nanofibers can be more tightly coated by the C-S-H gel, the bridging effect of the fibers is fully exerted, the gel particles and the carbon nanofibers are connected together like a molecular chain, and the compression resistance and the toughness of the concrete are enhanced.
In this example, the modified nano CaCO3The particle size range of (A) is 15-30 nm; the modified nano TiO2The particle size range of the nano-material is 5-15nm, and the nano-material with different apertures can be filled into the micro-cracks with different apertures more closely, so that the compactness of the concrete is improved.
In the embodiment, the water reducing agent is a quaternary ammonium salt polycarboxylic acid water reducing agent, a melamine water reducing agent or a naphthalene water reducing agent; the air entraining agent is any one of rosin resin air entraining agent and polyether air entraining agent; the accelerator is an alkali-free liquid accelerator, and particularly adopts TK-S alkali-free liquid accelerator, so that a large amount of needle-like ettringite is generated in the hydration process of cement slurry, and can be mutually interpenetrated with fibrous calcium silicate hydrate to form a network structure, and the structure is favorable for improving the mechanical property of concrete; in addition, after the alkali-free liquid accelerator is doped, the pore structure in the cement slurry is changed, the pore diameter of pores is concentrated below 100nm, and the pore structure can improve the compressive strength of concrete.
In the embodiment, the preservative comprises the following raw materials in parts by weight: 10-15 parts of triethanolamine, 10-15 parts of ferric chloride and 15-20 parts of polysiloxane. The corrosion inhibitor has good corrosion resistance to corrosive substances of chloride, can effectively reduce the corrosion of other corrosive substances to concrete, and improves the corrosion resistance of the concrete.
In this embodiment, the sand is a continuous gradation, in which the sand having a particle size of more than 5.0mm accounts for 2% by weight of the sand, the sand having a particle size of 2.5mm to 5.0mm accounts for 18% by weight of the sand, the sand having a particle size of 1.2mm to 2.5mm accounts for 15% by weight of the sand, the sand having a particle size of 0.5mm to 1.2mm accounts for 12% by weight of the sand, the sand having a particle size of 0.1mm to 0.5mm accounts for 18% by weight of the sand, the sand having a particle size of 0.10mm to 0.1mm accounts for 24% by weight of the sand, and the sand having a particle size of less than 0.12mm accounts for 11% by weight of the sand.
In this example, the crushed stone had a particle size of 8 to 12mm and an apparent density of 2600kg/m3The loose bulk density is 1100kg/m3The loose-packing porosity was 70%, the crush value was 6%, the sludge content was 0.4%, and the alkali aggregate reaction expansion rate for 14 days was 0.03%.
Example 1
The reinforced compact anticorrosive sprayed concrete comprises the following components in parts by weight: 300 parts of cement, 100 parts of reinforcing admixture, 800 parts of sand, 750 parts of broken stone, 5 parts of water reducing agent, 1 part of air entraining agent, 50 parts of preservative, 20 parts of accelerating agent and 100 parts of water; the reinforcing admixture comprises: 20 parts of silica fume, 20 parts of fly ash and modified nano CaCO35 parts of modified nano TiO25 parts of carbon nanofiber and 5 parts of carbon nanofiber.
Example 2
The reinforced compact anticorrosive sprayed concrete comprises the following components in parts by weight: 400 parts of cement, 150 parts of reinforcing admixture, 900 parts of sand, 850 parts of broken stone, 10 parts of water reducing agent, 5 parts of air entraining agent, 70 parts of preservative, 40 parts of accelerating agent and 150 parts of water; the reinforcing admixture comprises: 30 parts of silicon ash, 30 parts of fly ash and modified nano CaCO310 portions of modified nano TiO210 parts of carbon nanofiber and 10 parts of carbon nanofiber.
Example 3
The reinforced compact anticorrosive sprayed concrete comprises the following components in parts by weight: 350 parts of cement, 130 parts of reinforcing admixture, 850 parts of sand, 800 parts of broken stone, 8 parts of water reducing agent, 3 parts of air entraining agent, 60 parts of preservative, 30 parts of accelerating agent and 130 parts of water; the reinforcing admixture comprises: 25 parts of silica fume, 25 parts of fly ash and modified nano CaCO38 parts of modified nano TiO28 parts of carbon nanofiber and 8 parts of carbon nanofiber.
Example 4
The reinforced compact anticorrosive sprayed concrete comprises the following components in parts by weight: 320 parts of cement, 120 parts of reinforcing admixture, 820 parts of sand, 760 parts of broken stone, 6 parts of water reducing agent, 2 parts of air entraining agent, 55 parts of preservative, 25 parts of accelerating agent and 110 parts of water; the reinforcing admixture comprises: 23 parts of silica fume, 23 parts of fly ash and modified nano CaCO37 parts of modified nano TiO27 parts of carbon nanofiber and 7 parts of carbon nanofiber.
Example 5
The reinforced compact anticorrosive sprayed concrete comprises the following components in parts by weight: 310 parts of cement, 110 parts of reinforcing admixture, 810 parts of sand, 770 parts of crushed stone, 9 parts of water reducing agent, 4 parts of air entraining agent, 65 parts of preservative, 35 parts of accelerating agent and 140 parts of water; the reinforcing admixture comprises: 28 parts of silica fume, 28 parts of fly ash and modified nano CaCO39 parts of modified nano TiO29 parts of carbon nanofiber and 9 parts of carbon nanofiber.
Example 6
The reinforced compact anticorrosive sprayed concrete comprises the following components in parts by weight: 380 parts of cement, 140 parts of reinforcing admixture and sand880 parts of macadam, 820 parts of water reducing agent, 9 parts of air entraining agent, 60 parts of preservative, 30 parts of accelerating agent and 140 parts of water; the reinforcing admixture comprises: 25 parts of silica fume, 25 parts of fly ash and modified nano CaCO37 parts of modified nano TiO27 parts of carbon nanofiber and 7 parts of carbon nanofiber.
Comparative example 1
The reinforced compact anticorrosive sprayed concrete comprises the following components in parts by weight: 380 parts of cement, 50 parts of reinforcing admixture, 880 parts of sand, 820 parts of broken stone, 9 parts of water reducing agent, 4 parts of air entraining agent, 60 parts of preservative, 30 parts of accelerating agent and 140 parts of water; the reinforcing admixture comprises: 10 parts of silica fume, 10 parts of fly ash and modified nano CaCO31 part of modified nano TiO21 part and 1 part of carbon nanofiber.
Comparative example 2
The reinforced compact anticorrosive sprayed concrete comprises the following components in parts by weight: 380 parts of cement, 200 parts of reinforcing admixture, 880 parts of sand, 820 parts of broken stone, 9 parts of water reducing agent, 4 parts of air entraining agent, 60 parts of preservative, 30 parts of accelerating agent and 140 parts of water; the reinforcing admixture comprises: 40 parts of silica fume, 40 parts of fly ash and modified nano CaCO315 parts of modified nano TiO215 parts of carbon nanofibers and 15 parts of carbon nanofibers.
Comparative example 3
The reinforced compact anticorrosive sprayed concrete comprises the following components in parts by weight: 380 parts of cement, 140 parts of reinforcing admixture, 880 parts of sand, 820 parts of broken stone, 9 parts of water reducing agent, 4 parts of air entraining agent, 60 parts of preservative, 30 parts of accelerating agent and 140 parts of water; the reinforcing admixture comprises: 25 parts of silica fume, 25 parts of fly ash and nano CaCO37 parts of nano TiO27 parts of carbon nanofiber and 7 parts of carbon nanofiber.
Comparative example 4
The reinforced compact anticorrosive sprayed concrete comprises the following components in parts by weight: 380 parts of cement, 140 parts of reinforcing admixture, 880 parts of sand, 820 parts of broken stone, 9 parts of water reducing agent, 4 parts of air entraining agent, 60 parts of preservative, 30 parts of accelerating agent and 140 parts of water; the reinforcing admixture comprises: 25 parts of silica fume, 25 parts of fly ash and 7 parts of carbon nanofiber.
Comparative example 5
The reinforced compact anticorrosive sprayed concrete comprises the following components in parts by weight: 380 parts of cement, 140 parts of reinforcing admixture, 880 parts of sand, 820 parts of broken stone, 9 parts of water reducing agent, 4 parts of air entraining agent, 60 parts of preservative, 30 parts of accelerating agent and 140 parts of water; the reinforcing admixture comprises: 25 parts of silica fume and 25 parts of fly ash.
Comparative example 6
The sprayed concrete comprises the following components in parts by weight: 520 parts of cement, 880 parts of sand, 820 parts of broken stone, 9 parts of water reducing agent, 4 parts of air entraining agent, 60 parts of preservative, 30 parts of accelerating agent and 140 parts of water.
Experimental example 1
The performance of the sprayed concrete of each of the above examples and comparative examples was tested; the evaluation indexes and the detection method are as follows:
the detection standard is as follows: standard test method for Performance of ordinary concrete mixtures (GB/T50080-2016)
Test method Standard for physical and mechanical Properties of concrete GB/T50081-2019
Standard test method for long-term performance and durability of ordinary concrete (GB/T50082-2009)
Standard of acceptance of construction quality of railway concrete works (TB10424-2018)
The performance indexes of the above examples and comparative spray coagulation are shown in table 1:
Figure BDA0002500409840000111
as can be seen from the above table:
(1) by comparing the experimental results of examples 1 to 6 with those of comparative examples 1 to 2, it can be seen that: the components of the reinforcing admixtures and the reinforcing admixtures of comparative examples 1 and 2 were out of the range of the examples of the present invention, which is sufficient to show that: the concrete provided by the embodiment of the invention has the advantages that the compounding of the component proportions can generate specific association, and the specific association cannot be replaced by other component proportions, so that the concrete provided by the invention has higher strength and better impermeability and crack resistance.
(2) By comparing the experimental results of examples 1 to 6 with the experimental result of comparative example 3, it can be known that: the invention adds modified nano CaCO3And modified nano TiO2Compared with the concrete added with unmodified nano CaCO3And nano TiO2The concrete has smaller electric flux and total alkali content and sulfur trioxide content, which shows that the modified nano CaCO3And nano TiO2The concrete structure has better compactness, impermeability and durability, can better resist the diffusion of chloride ions and the corrosion of sulfate, and can effectively reduce the probability of the rock salt which is melted in water and then permeates into the lining structure.
(3) By comparing the experimental results of examples 1 to 6 with the experimental result of comparative example 4, it can be known that: comparative example 4 without addition of modified Nano CaCO3And modified nano TiO2The concrete has higher strength, smaller electric flux, smaller total alkali content and sulfur trioxide content, better compactness, better impermeability and durability, better resistance to chloride ion diffusion and sulfate erosion, and capability of effectively reducing the probability of infiltration of rock salt into a lining structure after being melted in water.
(4) By comparing the experimental results of examples 1 to 6 with the experimental result of comparative example 5, it can be known that: comparative example 5 without addition of modified Nano CaCO3Modified nano TiO2The total alkali content and the total cracking area per unit area of the concrete are smaller, and the strength is higher, so that the concrete has better impermeability and crack resistance, can effectively relieve early chlorine ion permeation of the concrete, and improves the compressive strength of the concrete.
(5) By comparing the experimental results of examples 1 to 6 with the experimental result of comparative example 6, it can be known that: the reinforced admixture is not added in the comparative example 6, the shotcrete added with the reinforced admixture can achieve initial setting within 3min and final setting within 5min, the rebound rate is lower, the early strength of the shotcrete is higher, and the aim of safe and rapid support can be achieved; the later strength is increased more securely, and the construction specification requirement of the sprayed concrete is met. After the sprayed concrete is sprayed to a sprayed surface, the raw material particles are more compact and the cohesive force is increased, so that the raw material particles are adsorbed to the sprayed surface in time, the rebound rate of the sprayed concrete is reduced, the waste phenomenon of the sprayed concrete is greatly reduced, and the construction cost is reduced; and no permeation was observed.
In conclusion, the sprayed concrete provided by the invention has better impermeability, compactness, durability and crack resistance, can better resist chloride ion diffusion and sulfate erosion, and effectively reduces the probability of infiltration of rock salt into a lining structure after being melted in water; meanwhile, the adhesive property between the wall and the rock is better, the early strength is higher, and the aim of safe and quick support can be achieved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. The reinforced compact anticorrosive sprayed concrete is characterized by comprising the following components in parts by weight:
400 portions of cement, 100 portions of reinforcing admixture, 150 portions of sand, 900 portions of sand, 850 portions of gravel, 5-10 portions of water reducing agent, 1-5 portions of air entraining agent, 50-70 portions of preservative, 20-40 portions of accelerating agent and 150 portions of water;
the reinforcing admixture comprises: 20-30 parts of silica fume, 20-30 parts of fly ash, 10-20 parts of modified nano material and 5-10 parts of nano carbon fiber;
the modified nano material comprises modified nano CaCO3And modified nano TiO2；
The modification method of the modified nano material comprises the following steps:
(a) carrying out inorganic modification on the nano material, wherein the inorganic modification comprises the following steps of carrying out aluminum salt embedding treatment on the nano material: dropwise adding sodium hydroxide solution and aluminum sulfate solution into the nano material dispersion liquid under stirring stateKeeping the pH value between 10 and 11; after completion of the dropwise addition, the solution was adjusted to pH =7 with dilute sulfuric acid and aged for 4h with heat preservation to ensure A12O3Densifying, filtering, washing the filter cake, drying the filter cake at 120-140 ℃, and grinding to obtain A12O3A coated nanomaterial;
(b) carrying out organic modification on the nano material modified in the step (a), wherein the organic modification comprises the following steps of carrying out sodium dodecyl sulfate treatment on the nano material: adding water into the nano material obtained in the step (1), adjusting the pH value to be =2, performing ultrasonic treatment, pouring the ultrasonic nano material solution into a sodium dodecyl sulfate solution, stirring, reacting for 4-5h, filtering, performing vacuum drying, and grinding to obtain a modified nano material;
the nano material is nano CaCO3Or nano TiO2。
2. The reinforced dense anticorrosive sprayed concrete of claim 1, which comprises the following components in parts by weight:
400 parts of cement 350-containing material, 130 parts of reinforcing admixture 100-containing material, 850 parts of sand 800-containing material, 800 parts of gravel 750-containing material, 7-10 parts of water reducing agent, 1-3 parts of air entraining agent, 50-60 parts of preservative, 20-30 parts of accelerating agent and 130 parts of water 100-containing material;
the reinforcing admixture comprises: 20-25 parts of silica fume, 20-25 parts of fly ash, 10-15 parts of modified nano material and 7-10 parts of nano carbon fiber;
the modified nano material comprises modified nano CaCO3And modified nano TiO2。
3. The reinforced dense anticorrosive sprayed concrete of claim 1 or 2, wherein the modified nanomaterial comprises the following components in parts by weight: modified nano CaCO3: modified nano TiO2=1:0.5~2。
4. The reinforced dense anticorrosive sprayed concrete of claim 1, wherein the modified nano-CaCO3The particle size range of (A) is 15-30 nm; the modified nano TiO2The particle size range of (A) is 5-15 nm.
5. The reinforced dense anticorrosive sprayed concrete of claim 1, wherein the water reducer is a quaternary ammonium salt polycarboxylic acid water reducer, a melamine-based water reducer or a naphthalene-based water reducer; the air entraining agent is any one of rosin resin air entraining agent and polyether air entraining agent; the accelerator is an alkali-free liquid accelerator.
6. The reinforced dense anticorrosive sprayed concrete of claim 1, wherein the preservative comprises the following raw materials in parts by weight: 10-15 parts of triethanolamine, 10-15 parts of ferric chloride, 15-20 parts of polysiloxane and 35-45 parts of superfine limestone powder.
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