阅读说明：本技术 一种新型混凝土及其制备方法 (Novel concrete and preparation method thereof ) 是由 王洪来 周灿云 项春强 陈利 闫涛 丁锋 于 2020-05-23 设计创作，主要内容包括：本发明提供了一种新型混凝土及其制备方法,其涉及混凝土领域,旨在解决现有混凝土孔洞多的问题,新型混凝土原料按重量份包括以下组分：硅酸盐水泥50-85份,粉煤灰10-25份,骨料45-77份,膨润土30-66份,氧化石墨烯18-35份,纳米硅溶胶16-29份,填料9-19份,分散剂2-7份,泵送剂1-6份,消泡剂8-16份,抗裂剂7-16份,水78-96份。本发明的新型混凝土内部孔洞少,有效提高了混凝土的抗腐蚀性能,而且制备方法简单。(The invention provides novel concrete and a preparation method thereof, relates to the field of concrete, and aims to solve the problem that the existing concrete has many holes, wherein the novel concrete comprises the following components in parts by weight: 50-85 parts of portland cement, 10-25 parts of fly ash, 45-77 parts of aggregate, 30-66 parts of bentonite, 18-35 parts of graphene oxide, 16-29 parts of nano silica sol, 9-19 parts of filler, 2-7 parts of dispersant, 1-6 parts of pumping aid, 8-16 parts of defoaming agent, 7-16 parts of anti-cracking agent and 78-96 parts of water. The novel concrete has few internal holes, effectively improves the corrosion resistance of the concrete, and has simple preparation method.)

1. The novel concrete is characterized by comprising the following raw materials in parts by weight: 50-85 parts of portland cement, 10-25 parts of fly ash, 45-77 parts of aggregate, 30-66 parts of bentonite, 18-35 parts of graphene oxide, 16-29 parts of nano silica sol, 9-19 parts of filler, 2-7 parts of dispersant, 1-6 parts of pumping aid, 8-16 parts of defoaming agent, 7-16 parts of anti-cracking agent and 78-96 parts of water.

2. The novel concrete according to claim 1, characterized in that the raw materials comprise the following components in parts by weight: 66-74 parts of portland cement, 16-21 parts of fly ash, 56-69 parts of aggregate, 45-58 parts of bentonite, 22-29 parts of graphene oxide, 18-25 parts of nano silica sol, 10-15 parts of filler, 2-4 parts of dispersant, 2-5 parts of pumping aid, 9-11 parts of defoaming agent, 10-15 parts of anti-cracking agent and 83-91 parts of water.

3. The novel concrete according to claim 2, characterized in that the raw materials comprise the following components in parts by weight: 68 parts of portland cement, 20 parts of fly ash, 66 parts of aggregate, 54 parts of bentonite, 26 parts of graphene oxide, 22 parts of nano silica sol, 14 parts of filler, 3 parts of dispersing agent, 4 parts of pumping aid, 10 parts of defoaming agent, 13 parts of anti-cracking agent and 88 parts of water.

4. The novel concrete according to claim 1, characterized in that: the filler comprises the following components in parts by weight: 20-36 parts of graphene, 15-31 parts of liquid paraffin, SR-101-4 parts of emulsifier, 16-25 parts of glass fiber powder and 20-35 parts of mineral powder.

5. The novel concrete according to claim 1, characterized in that: the dispersing agent comprises the following components in parts by weight: 10-25 parts of isopropanol and 19-33 parts of dimethyl carbonate.

6. The novel concrete according to claim 1, characterized in that: the defoaming agent comprises the following components in parts by weight: 14-29 parts of fatty alcohol-polyoxyethylene ether and 16-22 parts of polydimethylsiloxane.

7. The novel concrete according to claim 1, characterized in that: the anti-cracking agent comprises the following components in parts by weight: 20-36 parts of KP-1 daub and 1-3 parts of octadecyl trimethyl ammonium chloride.

8. The method for preparing a novel concrete according to any one of claims 1 to 7, characterized by comprising the following steps:

adding portland cement, fly ash, aggregate, bentonite and graphene oxide into a stirrer, dry-mixing for 1-2 minutes at the rotating speed of 30 revolutions per minute, then adding a pumping aid, a defoaming agent, a filler and two thirds of water, and stirring for 6-8 minutes at the rotating speed of 30 revolutions per minute to obtain a first mixed material;

and adding the nano silica sol, the dispersing agent and the rest of water into the first mixed material, and continuously stirring for 4-5 minutes to obtain the novel concrete.

Technical Field

The invention relates to the technical field of concrete, in particular to novel concrete and a preparation method thereof.

Background

Concrete is a general name of composite materials which are prepared by mixing gel materials, aggregates and water according to a proper proportion and then are hardened for a certain time, and is the artificial civil engineering and construction material with the largest usage amount in the world.

Although concrete is a durable material, concrete is a non-uniform porous material, and the pores of concrete can allow carbon dioxide, water, chloride ions, sulfate and the like to enter the interior of concrete, so that the concrete is corroded, the concrete is damaged rapidly, and the service life of the concrete is greatly shortened.

In order to solve the problems, the invention provides concrete which has few holes and can effectively reduce the erosion of the concrete.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the novel concrete and the preparation method thereof, which can effectively reduce the holes in the concrete and improve the corrosion resistance of the concrete, and the preparation method is simple.

The above object of the present invention is achieved by the following technical solutions:

the novel concrete comprises the following raw materials in parts by weight: 50-85 parts of portland cement, 10-25 parts of fly ash, 45-77 parts of aggregate, 30-66 parts of bentonite, 18-35 parts of graphene oxide, 16-29 parts of nano silica sol, 9-19 parts of filler, 2-7 parts of dispersant, 1-6 parts of pumping aid, 8-16 parts of defoaming agent, 7-16 parts of anti-cracking agent and 78-96 parts of water.

By adopting the technical scheme, the portland cement, the fly ash and the aggregate are used as base materials of the concrete, and the bentonite can fill gaps in the concrete by utilizing the characteristic of water absorption and expansion of the bentonite; meanwhile, the graphene oxide improves the lubricating property of concrete by utilizing the excellent lubricating property of the graphene oxide, and reduces the generation of bubbles in the concrete mixing process; meanwhile, as the graphene oxide has a large number of polar groups such as hydroxyl groups, the graphene oxide can be embedded into the structure of the bentonite after the bentonite loses water molecules so as to fill the structural vacancy generated after the bentonite loses water; the nanometer silica sol also utilizes the self dispersion and permeability, reduces the generation of holes in concrete, and can be similarly compatible with graphene oxide due to a large amount of polar hydroxyl groups on the nanometer silica sol, the nanometer silica sol can be distributed at the positions of the holes in the concrete, and the nanometer silica sol can generate high-strength cross-linked high polymers in the curing process of the concrete, so that the holes in the concrete can be filled while the bonding strength of the cured concrete is improved; the dispersing agent is used as a functional additive for improving the dispersibility of the nano silica sol in concrete; the pumping aid, the defoaming agent, the filler and the anti-cracking agent are also used as functional additives, the pumping aid improves the water-reducing enhancement effect and the delayed coagulation plasticity-maintaining performance of the concrete, the defoaming agent reduces the generation of bubbles in the concrete mixing process, and the anti-cracking agent enhances the mechanical performance of the concrete after curing. Therefore, the holes in the concrete can be effectively reduced, the holes are distributed more uniformly, and the corrosion resistance of the concrete is improved.

The invention is further set up in that the novel concrete raw materials comprise the following components in parts by weight: 66-74 parts of portland cement, 16-21 parts of fly ash, 56-69 parts of aggregate, 45-58 parts of bentonite, 22-29 parts of graphene oxide, 18-25 parts of nano silica sol, 10-15 parts of filler, 2-4 parts of dispersant, 2-5 parts of pumping aid, 9-11 parts of defoaming agent, 10-15 parts of anti-cracking agent and 83-91 parts of water.

By adopting the technical scheme, the content ranges of all the components in the concrete are further refined, so that all the components in the concrete can be better matched with each other, and the comprehensive performance of the concrete is improved.

The invention is further set up in that the novel concrete raw materials comprise the following components in parts by weight: 68 parts of portland cement, 20 parts of fly ash, 66 parts of aggregate, 54 parts of bentonite, 26 parts of graphene oxide, 22 parts of nano silica sol, 14 parts of filler, 3 parts of dispersing agent, 4 parts of pumping aid, 10 parts of defoaming agent, 13 parts of anti-cracking agent and 88 parts of water.

By adopting the technical scheme, the content of each component in the concrete is further refined, so that the mutual matching of each component in the concrete is optimal, and the comprehensive performance of the concrete can be further improved.

The invention is further provided that the filler comprises the following components in parts by weight: 20-36 parts of graphene, 15-31 parts of liquid paraffin, SR-101-4 parts of emulsifier, 16-25 parts of glass fiber powder and 20-35 parts of mineral powder.

By adopting the technical scheme, the graphene serving as a two-dimensional carbon nano material has excellent strength and toughness, and can well improve the compressive strength of concrete; in addition, due to the fact that the graphene can be well dispersed in the nonpolar solvent, the added liquid paraffin can well disperse the graphene, and due to the addition of the emulsifier, the liquid paraffin can well disperse in the concrete, so that the graphene can well disperse in the concrete; the glass fiber powder is added into the concrete material as a filling material, and after the concrete is hardened, the hardness and the compressive strength of the concrete can be well enhanced; the mineral powder can improve the early strength of the concrete and the easy mixing property of the concrete.

The invention is further provided that the dispersant comprises the following components in parts by weight: 10-25 parts of isopropanol and 19-33 parts of dimethyl carbonate.

By adopting the technical scheme, the isopropanol is used as a polar organic solvent, so that the nano silica sol can be well dispersed in an isopropanol system, and meanwhile, the isopropanol can also be dissolved in water, so that the nano silica sol can be well dispersed in concrete; the bentonite can adsorb isopropanol, so that the nano silica sol smoothly leaves the solvent to form a high polymer, and the isopropanol can also fill structural gaps generated by dehydration of the bentonite; the dimethyl carbonate is added as a solvent of the isopropanol, so that the evaporation of the isopropanol is effectively reduced, and the isopropanol is better absorbed into the bentonite.

The invention is further provided that the defoaming agent comprises the following components in parts by weight: 14-29 parts of fatty alcohol-polyoxyethylene ether and 16-22 parts of polydimethylsiloxane.

By adopting the technical scheme, the fatty alcohol-polyoxyethylene ether is a nonionic surfactant, and can effectively reduce the surface tension of a concrete system, so that foaming in the concrete mixing process is inhibited; the polydimethylsiloxane has excellent lubricating property, can effectively defoam, has good hydrophobic property and can improve the water resistance of concrete.

The invention is further provided that the anti-cracking agent comprises the following components in parts by weight: 20-36 parts of KP-1 daub and 1-3 parts of octadecyl trimethyl ammonium chloride.

By adopting the technical scheme, the KP-1 daub is a new material compounded by potassium water glass as an adhesive, phosphate as a curing agent and a plurality of materials, has good adhesive property, can improve the bonding strength of concrete so as to improve the crack resistance of the concrete, and simultaneously has good water resistance and can further improve the impermeability of the concrete; octadecyl trimethyl ammonium chloride as a nonionic surfactant can promote the emulsification of KP-1 daub, so that KP-1 daub is uniformly dispersed in concrete.

The invention also aims to provide a preparation method of the novel concrete, which comprises the following steps:

adding portland cement, fly ash, aggregate and bentonite into a stirrer, dry-mixing for 1-2 minutes at the rotating speed of 30 revolutions per minute, then adding a pumping agent, a defoaming agent, a filler and two thirds of water, and stirring for 6-8 minutes at the rotating speed of 30 revolutions per minute to obtain a first mixed material;

and adding the graphene oxide, the nano silica sol, the dispersing agent and the rest of water into the first mixed material, and continuously stirring for 4-5 minutes to obtain the novel concrete.

By adopting the technical scheme, the portland cement, the fly ash, the aggregate and the bentonite are mixed in advance, so that the portland cement, the fly ash, the aggregate and the bentonite are more uniformly dispersed; then adding water, a pumping agent, a defoaming agent and a filler to fully expand the bentonite so as to fill the gap of the mortar system; and finally, adding graphene oxide, nano silica sol and a dispersing agent, so that the graphene oxide and the nano silica sol are uniformly dispersed in a concrete system on the premise of not influencing the water absorption expansion of the bentonite, the graphene oxide is uniformly and smoothly embedded into the bentonite after the bentonite loses water, and meanwhile, the nano silica sol can fill the concrete.

In conclusion, the beneficial technical effects of the invention are as follows:

1. the invention can fill the gap in the concrete by utilizing the self water-absorbing expansion characteristic of the bentonite; meanwhile, the graphene oxide improves the lubricating property of concrete by utilizing the excellent lubricating property of the graphene oxide, and reduces the generation of bubbles in the concrete mixing process; meanwhile, as the graphene oxide has a large number of polar groups such as hydroxyl groups, the graphene oxide can be embedded into the structure of the bentonite after the bentonite loses water molecules so as to fill the structural vacancy generated after the bentonite loses water;

2. the nano silica sol is added, the dispersion and the permeability of the nano silica sol are utilized, the generation of holes in concrete is reduced, and the nano silica sol is also provided with a large amount of polar hydroxyl groups, so that the nano silica sol can be compatible with graphene oxide similarly, the nano silica sol can be distributed at the positions of the holes in the concrete, and in the curing process of the concrete, the nano silica sol can generate high-strength cross-linked high polymers, so that the bonding strength of the cured concrete is improved, and simultaneously, the holes in the concrete can be filled, so that the holes in the concrete can be effectively reduced, the holes can be distributed more uniformly, and the corrosion resistance of the concrete is improved;

3. according to the invention, through the specified preparation steps, the holes in the prepared concrete are reduced, and the corrosion resistance of the concrete is effectively improved.

Detailed Description

The present invention will be described in further detail with reference to examples.

Meanwhile, the filler means a functional additive added in the present invention to improve the strength of concrete.