CN107827418A - A kind of superhigh tenacity concrete and preparation method thereof - Google Patents

Abstract

The invention discloses an ultra-high toughness concrete and a preparation method thereof. The concrete is prepared by mixing the following raw materials in proportion: Portland cement, steel slag aggregate, steel fiber, silicon powder, fly ash microbeads, lithium Salt slag, latex, rubber powder, nano water-based adhesive, graphene-modified glass fiber, trimethylolpropane, sulfoaluminate clinker, defoamer, polyoxyethylene alkyl ether, p-toluenesulfonic acid , Nano-silicon particles, nano-calcium carbonate, elastic silicone acrylic emulsion, N,N-dihydroxyethyl-3-alanine methyl ester, water, polycarboxylic acid type water reducing agent. The concrete obtained by the invention has high compressive strength and high tensile strength, can maintain super high ductility, and has good energy dissipation capacity and elastic modulus.

Description

A kind of super high toughness concrete and preparation method thereof

technical field

The invention relates to the field of building materials, in particular to an ultra-high toughness concrete and a preparation method thereof.

Background technique

Ordinary concrete is an artificial stone made of cementitious materials, coarse and fine aggregates and water in an appropriate proportion, and then hardened. From the macroscopic inspection of the concrete section, the concrete is composed of aggregate particles of different sizes and shapes and the hydrated cement paste of the discontinuous cementing medium. From the microscopic point of view, the two phases are neither uniform with each other in the microstructure. distribution, the microstructure itself is not homogeneous. The microstructure of the cement paste adjacent to the large-grained aggregate is usually quite different from the cement paste or mortar body in the system, that is, the interfacial transition zone. Since both the cement slurry body and the interface transition zone in concrete contain unevenly distributed, different types and quantities of solid phases, pores and microcracks, the concrete is susceptible to the influence of the external environment, resulting in the expansion of concrete microcracks and harmful substances. Intrusion causes concrete deterioration, reduces concrete durability, and affects the service life of concrete structures. At the same time, the compressive elastic modulus of existing concrete is low, and there is room for further improvement in compressive strength and flexural strength.

Contents of the invention

The purpose of the present invention is to provide an ultra-high toughness concrete and its preparation method. The obtained concrete has high compressive strength and high tensile strength, can maintain ultra-high ductility, and has good energy dissipation capacity and elastic modulus.

In order to achieve the above object, the technical scheme that the present invention takes is:

A kind of ultra-high toughness concrete, is prepared from the following raw materials by weight:

Portland cement 80-90 parts, steel slag aggregate 18-22 parts, steel fiber 13-17 parts, silicon fume 13-15 parts, fly ash microbeads 20-40 parts, lithium salt slag 2-3 parts, latex 5-9 parts, 13-14 parts of rubber powder, 6-7 parts of nano water-based adhesive, 18-25 parts of graphene modified glass fiber, 1-1.2 parts of trimethylolpropane, sulfoaluminate clinker 0.2-0.3 parts, 5-7 parts of defoamer, 0.2-0.3 parts of polyoxyethylene alkyl ether, 0.6-0.8 parts of p-toluenesulfonic acid, 2.5-8.5 parts of nano-silicon particles, 7-13 parts of nano-calcium carbonate, elastic 20-30 parts of silicone acrylic emulsion, 5-8 parts of N,N-dihydroxyethyl-3-alanine methyl ester, 30-40 parts of water, 0.3-0.9 parts of polycarboxylic acid type water reducer.

Wherein, the particle size of the rubber powder is 8-10 mesh.

Wherein, the steel slag in the steel slag aggregate has a diameter of 0.3-0.5mm.

Wherein, the glass fibers and steel fibers modified by graphene are all composed of long fibers, short fibers and medium fibers, wherein the mass ratio of long fibers, short fibers and medium fibers is 1:3:2. The length of the short fibers is 5-10 mm, the length of the medium fibers is 10-15 mm, and the length of the long fibers is 15-20 mm.

Preferably, it is prepared from the following raw materials in parts by weight:

80 parts of Portland cement, 18 parts of steel slag aggregate, 13 parts of steel fiber, 13 parts of silicon powder, 20 parts of fly ash microbeads, 2 parts of lithium salt slag, 5 parts of latex, 13 parts of rubber powder, nano water-based adhesive 6 parts of agent, 18 parts of graphene-modified glass fiber, 1 part of trimethylolpropane, 0.2 part of sulfoaluminate clinker, 5 parts of defoamer, 0.2 part of polyoxyethylene alkyl ether, p-toluenesulfonic acid 0.6 parts, 2.5 parts of nano-silicon particles, 7 parts of nano-calcium carbonate, 20 parts of elastic silicone acrylic emulsion, 5 parts of N,N-dihydroxyethyl-3-aminopropionic acid methyl ester, 30 parts of water, polycarboxylate 0.3 part of water agent.

Preferably, it is prepared from the following raw materials in parts by weight:

90 parts of Portland cement, 22 parts of steel slag aggregate, 17 parts of steel fiber, 15 parts of silicon powder, 40 parts of fly ash microbeads, 3 parts of lithium salt slag, 9 parts of latex, 14 parts of rubber powder, nano water-based adhesive 7 parts of agent, 25 parts of graphene-modified glass fiber, 1.2 parts of trimethylolpropane, 0.3 part of sulfoaluminate clinker, 7 parts of defoamer, 0.3 part of polyoxyethylene alkyl ether, p-toluenesulfonic acid 0.8 parts, 8.5 parts of nano-silicon particles, 13 parts of nano-calcium carbonate, 30 parts of elastic silicone acrylic emulsion, 8 parts of N,N-dihydroxyethyl-3-alanine methyl ester, 40 parts of water, polycarboxylate 0.9 part of aqueous solution.

Preferably, it is prepared from the following raw materials in parts by weight:

85 parts of Portland cement, 20 parts of steel slag aggregate, 15 parts of steel fiber, 14 parts of silicon powder, 30 parts of fly ash microbeads, 2.5 parts of lithium salt slag, 7 parts of latex, 13.5 parts of rubber powder, nano water-based adhesive 6.5 parts of agent, 21.5 parts of graphene-modified glass fiber, 1.1 parts of trimethylolpropane, 0.25 parts of sulfoaluminate clinker, 6 parts of defoamer, 0.25 parts of polyoxyethylene alkyl ether, p-toluenesulfonic acid 0.7 parts, 5.5 parts of nano-silicon particles, 10 parts of nano-calcium carbonate, 25 parts of elastic silicone acrylic emulsion, 6.5 parts of N,N-dihydroxyethyl-3-aminopropionic acid methyl ester, 35 parts of water, polycarboxylate 0.6 part of aqueous solution.

The present invention also provides a preparation method of ultra-high toughness concrete, comprising the steps of:

S1, weigh each component according to the above-mentioned formula;

S2. Disperse the weighed steel fiber and graphene-modified glass fiber in water by ultrasonic waves to form a suspension;

S3. Put the weighed steel slag aggregate, silicon powder, fly ash microbeads, lithium salt slag, latex, rubber powder, nano-silicon particles, nano-calcium carbonate, and elastic silicon-acrylic emulsion into a high-speed shearing machine to mix and stir evenly After that, mixture A is obtained;

S4, the weighed trimethylolpropane, defoamer, polyoxyethylene alkyl ether, p-toluenesulfonic acid, N,N-dihydroxyethyl-3-aminopropionic acid methyl ester, nano water-based adhesive After stirring evenly with the obtained suspension under the pressure of 0.8-1MPa, add the mixed material A under the pressure of 0.8-1MPa, after stirring evenly, add the weighed Portland cement, sulphoaluminate cooked Stir the material evenly to obtain the mixed material B;

S5. Mix the weighed polycarboxylate water reducer with half of the weighed water under a pressure of 0.6 MPa and stir evenly to obtain the mixed material C;

S6. Add the obtained mixed material C into the obtained mixed material B, stir evenly, and then transport the obtained mixed material into the finished product homogenization bin with a hoist, and obtain the product after being homogenized by the air generated at the bottom of the homogenized bin.

The present invention has the following beneficial effects:

Steel fibers and graphene-modified glass fibers rely on countless fibers to form a network-like support system in concrete to delay and prevent early plastic cracks in concrete due to plastic shrinkage, and can play a pulling role inside the concrete to further increase Toughness of concrete; nano-silicon particles have a special network structure, and cooperate with nano-calcium carbonate to establish a new network structure on the basis of the original network structure of concrete paste, effectively preventing the expansion of micro-cracks inside the concrete , which improves the bending and tensile strength of concrete; on the one hand, the elastic silicone acrylic emulsion can fill the gaps inside the concrete and improve its impermeability; on the other hand, its high toughness endows the concrete with strong mechanical resistance; through The synergistic use of trimethylolpropane, defoamer, polyoxyethylene alkyl ether, p-toluenesulfonic acid, and N,N-dihydroxyethyl-3-aminopropionic acid methyl ester further improves the compressive strength of concrete .

Detailed ways

In order to make the objects and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In the following examples, the particle size of the rubber powder used is 8-10 mesh. The steel slag in the steel slag aggregate used has a diameter of 0.3-0.5mm. The graphene-modified glass fibers and steel fibers used are all composed of long fibers, short fibers and medium fibers, wherein the mass ratio of long fibers, short fibers and medium fibers is 1:3:2. The length of the short fibers is 5-10 mm, the length of the medium fibers is 10-15 mm, and the length of the long fibers is 15-20 mm.

Example 1

A kind of ultra-high toughness concrete, is prepared from the following raw materials by weight:

80 parts of Portland cement, 18 parts of steel slag aggregate, 13 parts of steel fiber, 13 parts of silicon powder, 20 parts of fly ash microbeads, 2 parts of lithium salt slag, 5 parts of latex, 13 parts of rubber powder, nano water-based adhesive 6 parts of agent, 18 parts of graphene-modified glass fiber, 1 part of trimethylolpropane, 0.2 part of sulfoaluminate clinker, 5 parts of defoamer, 0.2 part of polyoxyethylene alkyl ether, p-toluenesulfonic acid 0.6 parts, 2.5 parts of nano-silicon particles, 7 parts of nano-calcium carbonate, 20 parts of elastic silicone acrylic emulsion, 5 parts of N,N-dihydroxyethyl-3-aminopropionic acid methyl ester, 30 parts of water, polycarboxylate 0.3 part of water agent.

Example 2

A kind of ultra-high toughness concrete, is prepared from the following raw materials by weight:

90 parts of Portland cement, 22 parts of steel slag aggregate, 17 parts of steel fiber, 15 parts of silicon powder, 40 parts of fly ash microbeads, 3 parts of lithium salt slag, 9 parts of latex, 14 parts of rubber powder, nano water-based adhesive 7 parts of agent, 25 parts of graphene-modified glass fiber, 1.2 parts of trimethylolpropane, 0.3 part of sulfoaluminate clinker, 7 parts of defoamer, 0.3 part of polyoxyethylene alkyl ether, p-toluenesulfonic acid 0.8 parts, 8.5 parts of nano-silicon particles, 13 parts of nano-calcium carbonate, 30 parts of elastic silicone acrylic emulsion, 8 parts of N,N-dihydroxyethyl-3-alanine methyl ester, 40 parts of water, polycarboxylate 0.9 part of aqueous solution.

Example 3

A kind of ultra-high toughness concrete, is prepared from the following raw materials by weight:

85 parts of Portland cement, 20 parts of steel slag aggregate, 15 parts of steel fiber, 14 parts of silicon powder, 30 parts of fly ash microbeads, 2.5 parts of lithium salt slag, 7 parts of latex, 13.5 parts of rubber powder, nano water-based adhesive 6.5 parts of agent, 21.5 parts of graphene-modified glass fiber, 1.1 parts of trimethylolpropane, 0.25 parts of sulfoaluminate clinker, 6 parts of defoamer, 0.25 parts of polyoxyethylene alkyl ether, p-toluenesulfonic acid 0.7 parts, 5.5 parts of nano-silicon particles, 10 parts of nano-calcium carbonate, 25 parts of elastic silicone acrylic emulsion, 6.5 parts of N,N-dihydroxyethyl-3-aminopropionic acid methyl ester, 35 parts of water, polycarboxylate 0.6 part of aqueous solution.

The embodiment of the present invention also provides a preparation method of ultra-high toughness concrete, comprising the following steps:

S1, take each component by weighing the formula described in embodiment 1-embodiment 3;

S2. Disperse the weighed steel fiber and graphene-modified glass fiber in water by ultrasonic waves to form a suspension;

S3. Put the weighed steel slag aggregate, silicon powder, fly ash microbeads, lithium salt slag, latex, rubber powder, nano-silicon particles, nano-calcium carbonate, and elastic silicon-acrylic emulsion into a high-speed shearing machine to mix and stir evenly After that, mixture A is obtained;

S4, the weighed trimethylolpropane, defoamer, polyoxyethylene alkyl ether, p-toluenesulfonic acid, N,N-dihydroxyethyl-3-aminopropionic acid methyl ester, nano water-based adhesive After stirring evenly with the obtained suspension under the pressure of 0.8-1MPa, add the mixed material A under the pressure of 0.8-1MPa, after stirring evenly, add the weighed Portland cement, sulphoaluminate cooked Stir the material evenly to obtain the mixed material B;

S5. Mix the weighed polycarboxylate water reducer with half of the weighed water under a pressure of 0.6 MPa and stir evenly to obtain the mixed material C;

S6. Add the obtained mixed material C into the obtained mixed material B, stir evenly, and then transport the obtained mixed material into the finished product homogenization bin with a hoist, and obtain the product after being homogenized by the air generated at the bottom of the homogenized bin.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be It is regarded as the protection scope of the present invention.

Claims (9)

1. A kind of ultra-high toughness concrete, is characterized in that, is prepared from by the raw material of following weight part: Portland cement 80-90 parts, steel slag aggregate 18-22 parts, steel fiber 13-17 parts, silicon fume 13-15 parts, fly ash microbeads 20-40 parts, lithium salt slag 2-3 parts, latex 5-9 parts, 13-14 parts of rubber powder, 6-7 parts of nano water-based adhesive, 18-25 parts of graphene modified glass fiber, 1-1.2 parts of trimethylolpropane, sulfoaluminate clinker 0.2-0.3 parts, 5-7 parts of defoamer, 0.2-0.3 parts of polyoxyethylene alkyl ether, 0.6-0.8 parts of p-toluenesulfonic acid, 2.5-8.5 parts of nano-silicon particles, 7-13 parts of nano-calcium carbonate, elastic 20-30 parts of silicone acrylic emulsion, 5-8 parts of N,N-dihydroxyethyl-3-alanine methyl ester, 30-40 parts of water, 0.3-0.9 parts of polycarboxylic acid type water reducing agent. 2. A kind of ultra-high toughness concrete as claimed in claim 1, is characterized in that, the particle diameter of described rubber powder is 8-10 order. 3. A kind of super high toughness concrete as claimed in claim 1, is characterized in that, the diameter of steel slag in described steel slag aggregate is 0.3-0.5mm. 4. a kind of ultra-high toughness concrete as claimed in claim 1, is characterized in that, the glass fiber and steel fiber of described graphene modification are all made of long fiber, short fiber and medium fiber, wherein, long fiber, short The mass ratio of fiber to medium fiber is 1:3:2. 5. A kind of ultra-high toughness concrete as claimed in claim 4, is characterized in that, the length of described short fiber is 5-10 millimeter, the length of medium fiber is 10-15 millimeter, and the length of long fiber is 15-20 millimeter. 6. A kind of ultra-high toughness concrete as claimed in claim 1, is characterized in that, is prepared from the raw material of following weight part: 80 parts of Portland cement, 18 parts of steel slag aggregate, 13 parts of steel fiber, 13 parts of silicon powder, 20 parts of fly ash microbeads, 2 parts of lithium salt slag, 5 parts of latex, 13 parts of rubber powder, nano water-based adhesive 6 parts of agent, 18 parts of graphene-modified glass fiber, 1 part of trimethylolpropane, 0.2 part of sulfoaluminate clinker, 5 parts of defoamer, 0.2 part of polyoxyethylene alkyl ether, p-toluenesulfonic acid 0.6 parts, 2.5 parts of nano-silicon particles, 7 parts of nano-calcium carbonate, 20 parts of elastic silicone acrylic emulsion, 5 parts of N,N-dihydroxyethyl-3-aminopropionic acid methyl ester, 30 parts of water, polycarboxylate 0.3 part of water agent. 7. A kind of ultra-high toughness concrete as claimed in claim 1, is characterized in that, is prepared from the raw material of following weight part: 90 parts of Portland cement, 22 parts of steel slag aggregate, 17 parts of steel fiber, 15 parts of silicon powder, 40 parts of fly ash microbeads, 3 parts of lithium salt slag, 9 parts of latex, 14 parts of rubber powder, nano water-based adhesive 7 parts of agent, 25 parts of graphene-modified glass fiber, 1.2 parts of trimethylolpropane, 0.3 part of sulfoaluminate clinker, 7 parts of defoamer, 0.3 part of polyoxyethylene alkyl ether, p-toluenesulfonic acid 0.8 parts, 8.5 parts of nano-silicon particles, 13 parts of nano-calcium carbonate, 30 parts of elastic silicone acrylic emulsion, 8 parts of N,N-dihydroxyethyl-3-alanine methyl ester, 40 parts of water, polycarboxylate 0.9 part of aqueous solution. 8. A kind of ultra-high toughness concrete as claimed in claim 1, is characterized in that, is prepared from the raw material of following weight part: 85 parts of Portland cement, 20 parts of steel slag aggregate, 15 parts of steel fiber, 14 parts of silicon powder, 30 parts of fly ash microbeads, 2.5 parts of lithium salt slag, 7 parts of latex, 13.5 parts of rubber powder, nano water-based adhesive 6.5 parts of agent, 21.5 parts of graphene-modified glass fiber, 1.1 parts of trimethylolpropane, 0.25 parts of sulfoaluminate clinker, 6 parts of defoamer, 0.25 parts of polyoxyethylene alkyl ether, p-toluenesulfonic acid 0.7 parts, 5.5 parts of nano-silicon particles, 10 parts of nano-calcium carbonate, 25 parts of elastic silicone acrylic emulsion, 6.5 parts of N,N-dihydroxyethyl-3-aminopropionic acid methyl ester, 35 parts of water, polycarboxylate 0.6 part of aqueous solution. 9. A preparation method for ultra-high toughness concrete, characterized in that, comprising the steps of: S1, each component is weighed by the formula described in any one of claims 1-8; S2. Disperse the weighed steel fiber and graphene-modified glass fiber in water by ultrasonic waves to form a suspension; S3. Put the weighed steel slag aggregate, silicon powder, fly ash microbeads, lithium salt slag, latex, rubber powder, nano-silicon particles, nano-calcium carbonate, and elastic silicon-acrylic emulsion into a high-speed shearing machine to mix and stir evenly After that, mixture A is obtained; S4, the weighed trimethylolpropane, defoamer, polyoxyethylene alkyl ether, p-toluenesulfonic acid, N,N-dihydroxyethyl-3-aminopropionic acid methyl ester, nano water-based adhesive After stirring evenly with the obtained suspension under the pressure of 0.8-1MPa, add the mixed material A under the pressure of 0.8-1MPa, after stirring evenly, add the weighed Portland cement, sulphoaluminate cooked Stir the material evenly to obtain the mixed material B; S5. Mix the weighed polycarboxylate water reducer with half of the weighed water under a pressure of 0.6 MPa and stir evenly to obtain the mixed material C; S6. Add the obtained mixed material C into the obtained mixed material B, stir evenly, and then transport the obtained mixed material into the finished product homogenization bin with a hoist, and obtain the product after being homogenized by the air generated at the bottom of the homogenized bin.