CN114213070A

CN114213070A - High-performance concrete prepared from recycled grout

Info

Publication number: CN114213070A
Application number: CN202111492147.3A
Authority: CN
Inventors: 邓英明
Original assignee: Guangxi Jianye Concrete Co ltd
Current assignee: Guangxi Jianye Concrete Co ltd
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2022-03-22

Abstract

The invention discloses a high-performance concrete prepared by utilizing recycled grout, which relates to the field of concrete and comprises the following components in parts by weight: cement 120-; 510 and 560 parts of gravel; 425 parts of mechanism sand 335-; 120 portions of fly ash and 180 portions of fly ash; 90-110 parts of glass ultrafine powder; 130 portions and 220 portions of tailing ultrafine powder; 80-100 parts of steel fiber; 90-120 parts of slurry; 40-60 parts of nano silicon dioxide; 20-30 parts of sodium carboxymethylcellulose; 20-28 parts of an additive, wherein the fly ash, the glass ultrafine powder, the nano silicon dioxide and the sodium carboxymethyl cellulose are adopted as a filling material, the sodium carboxymethyl cellulose is dissolved in water to generate certain viscosity, and a three-dimensional structure is formed in an alkaline environment, so that the fly ash, the glass ultrafine powder and the silicon dioxide can be bonded on the surface of the aggregate, the porosity of the coarse concrete is reduced, the structure of the recycled concrete is more compact, the anti-permeability performance of the recycled concrete is improved, and the structural strength of the recycled concrete is favorably improved.

Description

High-performance concrete prepared from recycled grout

Technical Field

The invention relates to the field of concrete, in particular to high-performance concrete prepared by utilizing recycled grout.

Background

Concrete, or cement concrete, is a composite material formed by binding fine and coarse aggregates with cement and hardening them over time, the most common of which in the past was lime-based cement, like lime paste, but hydraulic cements, such as calcium aluminate cement or portland cement, have also been used.

In recent years, researches show that a transition area exists near an interface between aggregate and cement paste, the shape and arrangement of hydration products in the transition area are different from those outside the transition area, particularly, a great amount of pores exist, so that the transition area becomes a weak link in concrete, is a multi-occurrence area of cracks, is also a channel for carbon dioxide to enter concrete, cement hydration reaction in the concrete generates a great amount of calcium hydroxide to form a high-alkaline environment, a compact oxide film is formed on the surface of a steel bar in the high-alkaline environment in the concrete, the steel bar can be protected from being corroded by chloride ions in the coastal environment, however, the pores in the concrete are more, carbon dioxide pores in the atmosphere penetrate into the concrete to damage the high-alkaline environment in the concrete, and further damage the oxide film on the surface of the steel bar, so that the steel bar in the concrete is easy to rust, affecting the safety of the building.

Disclosure of Invention

The invention aims to: in order to solve the problems of concrete cracking and easy rusting of internal steel bars, the high-performance concrete prepared by utilizing recycled grout is provided.

In order to achieve the purpose, the invention provides the following technical scheme: a high-performance concrete prepared by utilizing recycled slurry comprises the following components in parts by weight: cement 120-; 510 and 560 parts of gravel; 425 parts of mechanism sand 335-; 120 portions of fly ash and 180 portions of fly ash; 90-110 parts of glass ultrafine powder; 130 portions and 220 portions of tailing ultrafine powder; 80-100 parts of steel fiber; 90-120 parts of slurry; 40-60 parts of nano silicon dioxide; 20-30 parts of sodium carboxymethylcellulose; 20-28 parts of an additive;

the additive comprises 5-8 parts of a water reducing agent; 6-8 parts of an antifreeze agent; 4-6 parts of an air entraining agent; 5-6 parts of a rust inhibitor.

Preferably, the water reducing agent is lignosulfonate and naphthalene sulfonate formaldehyde polymer, the rust inhibitor is calcium nitrite, the antifreeze is a mixture of triethanolamine and nitrite, and the air entraining agent is a rosin derivative.

By adopting the technical scheme: the water reducing agent can promote the cement particles to be dispersed, release the water among the cement particles, reduce the water consumption of the recycled concrete, enable the structure of the recycled concrete to be more compact, improve the stability of the recycled concrete, and the rust inhibitor can prevent reinforcing steel bars from rusting; the antifreezing agent can prevent concrete from cracking; the air entraining agent leads the concrete mixture to introduce air during stirring to form micro bubbles;

preferably, the specific surface area of the tailing ultrafine powder is more than or equal to 660m2/kg, the laser particle size parameter D50 is less than or equal to 10 mu m, the loss on ignition is less than or equal to 2.0 percent, and the 28D activity index is more than or equal to 120 percent.

By adopting the technical scheme: the concrete reinforcing agent is applied to super-strong concrete, not only has obvious effect of increasing the strength of the concrete, but also improves the durability of the concrete, and can reduce the consumption of natural resources.

Preferably, the length of the steel fiber is less than or equal to 8mm, the diameter is less than or equal to 0.4mm, and the tensile strength is more than or equal to 1800 MPa.

By adopting the technical scheme: the anti-cracking performance of the concrete is obviously improved, and the safety of the building is improved.

Preferably, the particle size of the nano silicon dioxide is less than or equal to 40 nm.

By adopting the technical scheme: the porosity of the coarse concrete is reduced, the structure of the recycled concrete is more compact, the anti-permeability performance of the recycled concrete is improved, and the improvement of the structural strength of the recycled concrete is facilitated

Preferably, the particle size of the macadam is less than or equal to 18mm, the water absorption is 4-5%, and the content of mud blocks is less than or equal to 0.5%.

By adopting the technical scheme: the stability of the recycled concrete can be improved by controlling the water absorption rate and the mud content of the macadam, and the structural strength of the recycled concrete is improved.

Preferably, the grain diameter of the machine-made sand is less than or equal to 3mm, the water absorption is 6-7%, and the content of mud blocks is less than or equal to 0.3%.

By adopting the technical scheme: the stability of the recycled concrete can be improved by controlling the water absorption rate and the mud content of the sand grains.

Claims

1. The high-performance concrete prepared by utilizing the recycled grout is characterized in that: the composition comprises the following components in parts by weight: cement 120-; 510 and 560 parts of gravel; 425 parts of mechanism sand 335-; 120-180 parts of fly ash; 90-110 parts of glass ultrafine powder; 130 portions and 220 portions of tailing ultrafine powder; 80-100 parts of steel fiber; 90-120 parts of slurry; 40-60 parts of nano silicon dioxide; 20-30 parts of sodium carboxymethylcellulose; 20-28 parts of an additive;

2. The high-performance concrete prepared by using the recycled slurry as claimed in claim 1, wherein: the water reducing agent is lignosulfonate and naphthalene sulfonate formaldehyde polymer, the rust inhibitor is calcium nitrite, the antifreezing agent is a mixture of triethanolamine and nitrite, and the air entraining agent is a rosin derivative.

3. The high-performance concrete prepared by using the recycled slurry as claimed in claim 1, wherein: the specific surface area of the tailing ultrafine powder is more than or equal to 660m2/kg, the laser particle size parameter D50 is less than or equal to 10 mu m, the loss on ignition is less than or equal to 2.0 percent, and the 28D activity index is more than or equal to 120 percent.

4. The high-performance concrete prepared by using the recycled slurry as claimed in claim 1, wherein: the length of the steel fiber is less than or equal to 8mm, the diameter is less than or equal to 0.4mm, and the tensile strength is more than or equal to 1800 MPa.

5. The high-performance concrete prepared by using the recycled slurry as claimed in claim 1, wherein: the grain size of the nano silicon dioxide is less than or equal to 40 nm.

6. The high-performance concrete prepared by using the recycled slurry as claimed in claim 1, wherein: the particle size of the gravel is less than or equal to 18mm, the water absorption is 4-5%, and the content of mud blocks is less than or equal to 0.5%.

7. The high-performance concrete prepared by using the recycled slurry as claimed in claim 1, wherein: the grain size of the machine-made sand is less than or equal to 3mm, the water absorption is 6-7%, and the content of mud blocks is less than or equal to 0.3%.