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Corrosion-resistant recycled concrete and production process thereof

A technology of recycled concrete and corrosion resistance, applied in the field of concrete, can solve the problems of insufficient compactness of concrete, corroded concrete steel bars, cracks at the interface, etc., so as to avoid adverse effects, improve corrosion resistance, and increase strength.

Inactive Publication Date: 2021-05-04
南通友力混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned related technologies, the inventor believes that the interface between the recycled aggregate and the cement paste causes the concrete in the transition zone of the interface to be not dense enough, and cracks are likely to be generated at the interface, so that chloride ions, carbon dioxide, sulfate, etc. are easily Infiltrate and corrode the steel bars inside the concrete, reducing the strength of the building, so the above-mentioned concrete has the defect of poor corrosion resistance

Method used

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  • Corrosion-resistant recycled concrete and production process thereof
  • Corrosion-resistant recycled concrete and production process thereof

Examples

Experimental program
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Effect test

preparation example 1

[0036] The preparation method of recycled aggregate is as follows:

[0037] (1) Use running water to clean the abandoned concrete surface to remove impurities such as soil on the abandoned concrete surface;

[0038] (2) crushing and grading the discarded concrete after cleaning, and then further grinding the discarded concrete after crushing to obtain particles with a particle diameter of 5-10 mm;

[0039] 3) Put the ground particles into the heating furnace, and continuously feed carbon dioxide into the heating furnace, the flow rate of carbon dioxide is 1L / h, raise the temperature of the heating furnace to 500°C, and then keep it warm for 1h;

[0040] (4) Evenly disperse cement and silicon powder in water to obtain cement slurry. In the cement slurry, the cement content is 0.1kg / L, and the silicon powder content is 0.15kg / L. Then the concrete after heat treatment is soaked in the cement slurry for 2h, And at intervals of 30 minutes, continue to stir for 5 minutes;

[0041]...

preparation example 2

[0043] (1) Use running water to clean the abandoned concrete surface to remove impurities such as soil on the abandoned concrete surface;

[0044] (2) crushing and grading the discarded concrete after cleaning, and then further grinding the discarded concrete after crushing to obtain particles with a particle diameter of 5-10 mm;

[0045] 3) Put the ground particles into the heating furnace, and continuously feed carbon dioxide into the heating furnace, the flow rate of carbon dioxide is 1L / h, raise the temperature of the heating furnace to 700°C, and then keep it warm for 2h;

[0046] (4) Disperse cement and silicon powder evenly in water to obtain cement slurry. In the cement slurry, the cement content is 0.1kg / L, and the silicon powder content is 0.15kg / L. Then the concrete after heat treatment is soaked in the cement slurry for 3h, And keep stirring for 10 minutes at an interval of 30 minutes;

[0047] (5) After soaking, filter the excess cement slurry, and the obtained s...

preparation example 3

[0049] (1) Use running water to clean the abandoned concrete surface to remove impurities such as soil on the abandoned concrete surface;

[0050] (2) crushing and grading the discarded concrete after cleaning, and then further grinding the discarded concrete after crushing to obtain particles with a particle diameter of 5-10 mm;

[0051] 3) Put the ground particles into the heating furnace, and continuously feed carbon dioxide into the heating furnace, the flow rate of carbon dioxide is 1L / h, raise the temperature of the heating furnace to 900°C, and then keep it warm for 1.5h;

[0052] (4) Evenly disperse cement and silicon powder in water to obtain cement slurry. In the cement slurry, the cement content is 0.1kg / L, and the silicon powder content is 0.15kg / L. Then the concrete after heat treatment is soaked in the cement slurry for 2h, And keep stirring for 10 minutes at an interval of 30 minutes;

[0053] (5) After soaking, filter the excess cement slurry, and the obtained...

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Abstract

The invention relates to the technical field of concrete, and particularly discloses a corrosion-resistant recycled concrete and a production process thereof. The corrosion-resistant recycled concrete is prepared from, by weight, 250 to 300 parts of cement, 600 to 650 parts of sand, 920 to 980 parts of stones, 580 to 630 parts of recycled aggregate, 60 to 70 parts of fly ash, 30 to 40 parts of nano calcium carbonate, 25 to 35 parts of nano silicon dioxide, 20 to 30 parts of reinforced fibers, 8 to 12 parts of a tackifier, 6 to 8 parts of a water reducing agent and 170 to 210 parts of water. The preparation method comprises the step of uniformly stirring the raw materials. As the recycled aggregate is adopted in the recycled concrete system, on one hand, the generation cost of the concrete can be reduced, on the other hand, the recycling of the waste concrete is realized, and the prepared recycled concrete has excellent corrosion resistance.

Description

technical field [0001] This application relates to the technical field of concrete, more specifically, it relates to a corrosion-resistant recycled concrete and its production process. Background technique [0002] The production of cement concrete has played a positive role in promoting the rapid development of the construction industry. However, with the sharp increase in the demand for concrete and the mass production of waste concrete, the resulting resource, energy and environmental problems are also becoming more and more serious. Recycling construction waste and replacing some natural resources to produce building materials is an important way to protect the natural environment, improve the environment, and advance sustainable development. Recycled concrete refers to a new type of concrete prepared by distributing and mixing waste concrete in a certain proportion after crushing, cleaning and grading, partially or completely replacing natural aggregates such as sand an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/16C04B20/10C04B14/06C04B14/26C04B111/20
CPCC04B28/04C04B18/16C04B20/1077C04B14/06C04B14/28C04B2111/00008C04B2111/20C04B2201/50C04B2111/2015C04B14/02C04B18/08C04B16/0633C04B14/48C04B18/24C04B14/104C04B24/383C04B24/2652C04B2103/302C04B20/04C04B20/026C04B20/02C04B20/1055Y02W30/91
Inventor 张晓杰徐丽
Owner 南通友力混凝土有限公司
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