Pervious recycled concrete resistant to chloride ion erosion and preparation method thereof

A technology for recycling concrete and chloride ions, applied in the field of concrete, can solve the problems of poor resistance to chloride ion corrosion, cracks at the interface, corrosion of concrete steel bars, etc., and achieves the effects of enhancing compactness, reducing cracks, and reducing interface effects.

Inactive Publication Date: 2021-03-02
深圳市恒星建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the related technologies mentioned above, the inventor believes that the interface between the recycled concrete 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 are easy to penetrate and corrode the interior of the concrete The reinforced steel bars reduce the strength of the building, so the above-mentioned concrete has the defect of poor resistance to chloride ion erosion

Method used

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  • Pervious recycled concrete resistant to chloride ion erosion and preparation method thereof
  • Pervious recycled concrete resistant to chloride ion erosion and preparation method thereof

Examples

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Effect test

preparation example 1

[0037] The preparation method of recycled aggregate is as follows:

[0038] 1) cleaning the waste concrete surface to remove impurities on the waste concrete surface;

[0039] 2) Crushing and grading the cleaned waste concrete, and then further ball milling the broken waste concrete to obtain particles with a particle size of 0.1-0.2 mm;

[0040] 3) heat-treating the ground particles at 650°C for 1 hour;

[0041] 4) Soak the heat-treated particles in a calcium hydroxide solution with a mass fraction of 20 wt%, and the solid-to-liquid ratio of the particles to the lye is 1:4;

[0042] 5) After soaking, dry to obtain recycled aggregate.

preparation example 2

[0044] The preparation method of recycled aggregate is as follows:

[0045] 1) cleaning the waste concrete surface to remove impurities on the waste concrete surface;

[0046] 2) Crushing and grading the cleaned waste concrete, and then further ball milling the broken waste concrete to obtain particles with a particle size of 0.1-0.2 mm;

[0047] 3) heat-treating the ground particles at 650°C for 1 hour;

[0048] 4) Soak the heat-treated particles in a sodium hydroxide solution with a mass fraction of 20 wt%, and the solid-to-liquid ratio of the particles to the lye is 1:4;

[0049] 5) After soaking, dry to obtain recycled aggregate.

preparation example 3

[0051] The preparation method of recycled aggregate is as follows:

[0052] 1) cleaning the waste concrete surface to remove impurities on the waste concrete surface;

[0053] 2) Crushing and grading the cleaned waste concrete, and then further ball milling the broken waste concrete to obtain particles with a particle size of 0.1-0.2 mm;

[0054] 3) heat-treating the ground particles at 650°C for 1 hour;

[0055] 4) The particles after heat treatment are soaked in the mixed solution of calcium hydroxide and sodium hydroxide, wherein the mass fraction of calcium hydroxide is 20wt%, the mass fraction of sodium hydroxide is 20wt%, the solid-liquid ratio of particles and lye 1:4;

[0056] 5) After soaking, dry to obtain recycled aggregate.

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Abstract

The invention relates to the technical field of concrete, and particularly discloses pervious recycled concrete resistant to chloride ion erosion and a preparation method thereof. The pervious recycled concrete is prepared from the following raw materials in parts by weight: 200-300 parts of cement, 600-700 parts of sand, 1000-1100 parts of gravels, 700-800 parts of recycled aggregate, 80-150 parts of fly ash, 60-100 parts of mineral powder, 70-120 parts of calcium carbonate, 50-100 parts of nanometer silicon dioxide, 40-80 parts of rubber powder, 30-50 parts of steel fibers, 5-7 parts of a tackifier, 3-5 parts of a water reducing agent and 170-230 parts of water. The preparation method comprises the step of uniformly mixing the raw materials to obtain the recycled concrete. By reducing interface action between the recycled aggregate and cement paste, the compactness of an interface transition area is improved, pores in the concrete are reduced, and the chloride ion permeation capacityis reduced, so the chloride ion erosion resistance of the recycled concrete is improved.

Description

technical field [0001] The application relates to the technical field of concrete, more specifically, it relates to a permeable recycled concrete resistant to chloride ion erosion and a preparation method thereof. Background technique [0002] With the rapid development of my country's construction industry, the demand for sand and gravel is also increasing, requiring a lot of mountain quarrying and digging to wash sand, which seriously damages the ecological environment. At the same time, the discharge of construction waste is increasing day by day, and its resource utilization rate is low. Abandoned concrete not only occupies valuable land, but also has caused environmental and social problems, especially in large cities where land and space are becoming increasingly scarce. in this way. Recycled concrete is the aggregate obtained by crushing, cleaning, grading and mixing waste concrete in a certain proportion, and using recycled aggregate as part or all of the aggregate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/20C04B2111/90C04B2201/50C04B18/167C04B14/06C04B14/02C04B18/08C04B18/141C04B18/22C04B14/48C04B14/28C04B14/062C04B24/18C04B2103/44
Inventor 许广森俞裕星俞建松邹承忠
Owner 深圳市恒星建材有限公司
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