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Modified recycled coarse aggregate, permeable water storage concrete and preparation method thereof

A technology of recycled coarse aggregate and concrete, which is applied in the field of permeable water-storage concrete and its preparation, and modified recycled coarse aggregate. It can solve the problems of permeable concrete that can only permeate water but not store water, and reduce its strength, so as to adjust the surrounding temperature and humidity. Good, increased early strength, permeable weight effect

Active Publication Date: 2022-02-11
CHANGAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above technical problems, the present invention provides a modified recycled coarse aggregate, permeable water-storage concrete and its preparation method, which solves the problem that the existing slurry-coated coarse aggregate wrapping layer is too thin so that the strength is reduced and the permeable concrete can only permeate water but not water storage problem

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  • Modified recycled coarse aggregate, permeable water storage concrete and preparation method thereof
  • Modified recycled coarse aggregate, permeable water storage concrete and preparation method thereof
  • Modified recycled coarse aggregate, permeable water storage concrete and preparation method thereof

Examples

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preparation example Construction

[0028] my country's construction waste has accounted for 30% to 40% of urban waste, and the annual discharge of construction waste has reached 400 million tons per year. At present, my country's construction waste is mostly disposed of in the form of open-air stacking. Harmful components in construction waste and small-sized gravel will seep into the nearby soil, causing pollution and damage to the soil structure. Therefore, the present invention adopts discarded bricks and cement blocks as coarse aggregate, and since the cylinder compressive strength of waste and old blocks is about 3MPa, it is modified by the method of the present invention, and the strength of the modified coarse aggregate can reach About 5MPa. The preparation method of modified recycled coarse aggregate of the present invention comprises the following processes:

[0029] Step 1: Break waste and old blocks into granular shapes with a particle size of 4.5 to 16.0 mm, then saturate the granular blocks with w...

Embodiment 1

[0044] This example discloses a modified recycled aggregate and its preparation method, which is made by the following method:

[0045] Step 1: Use a crusher to break the bricks into bricks with two particle sizes of 4.5-9.5mm and 9.5-16.0mm; saturate the broken bricks with water, and then dry the bricks with a wet cloth;

[0046] Step 2: Weigh the quality of cement according to the mass ratio of dry bricks to cement, wherein the mass ratio of dry bricks to cement is 1.69:1; the water-cement ratio of cement is 0.27. Mix the saturated surface dry bricks with cement evenly (manual mixing), add water after mixing evenly, and manually mix for 15 minutes. Spread the mixed aggregates on the flat cement floor (thin layer), and after the cement sets and hardens (about 2 hours), separate the bonded aggregates and dry them in the air;

[0047] Step 3: After 24 hours, perform secondary wrapping according to the wrapping process of step 2. After wrapping for 24 hours, sieve the modified ...

Embodiment 2

[0059] This example discloses a permeable water-storage concrete and its preparation. The raw materials for the preparation of the permeable water-storage concrete include 20% modified recycled coarse aggregate, 47.77% waste concrete coarse aggregate, 26% cement, and 6.2% water , 0.03% of the water reducing agent, the sum of the mass percentages of raw materials is 100%.

[0060] The preparation process of permeable water storage concrete is as follows:

[0061] Put the waste concrete into the crusher for crushing, and sieve the crushed aggregate into two grades of 4.5-9.5mm and 9.5-16.0mm. Then, the modified recycled coarse aggregate with a particle size of 4.5-9.5mm obtained in Example 1 and the waste concrete coarse aggregate with a particle size of 4.5-9.5mm are uniformly mixed in a volume ratio of 3:2 to obtain a particle size The mixed coarse aggregate is 4.5-9.5mm; the same method is used to prepare the mixed coarse aggregate with a particle size of 9.5-16.0mm; it can ...

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Abstract

The invention discloses a modified recycled coarse aggregate, permeable water-storage concrete and a preparation method thereof. The modified recycled coarse aggregate includes a waste block and a cement layer wrapped outside the waste block; the waste block The particle size is 4.5-16.0mm; the water-cement ratio of the cement is 0.22-0.28; the permeable water storage concrete includes coarse aggregate, cement, water and water reducer; the coarse aggregate includes the Modified recycled coarse aggregate and waste concrete coarse aggregate. The modified recycled coarse aggregate of the present invention is mixed with saturated bricks, cement and water to form a core-shell structure, fill micro-cracks on the surface of bricks, and increase its early strength; the surface of the coarse aggregate is coated with a layer of cement slurry The honeycomb structure with evenly distributed holes formed by mutual bonding has the characteristics of air permeability, water permeability and light weight; the invention not only effectively utilizes construction waste, but also has good performance in alleviating urban waterlogging and adjusting surrounding temperature and humidity.

Description

technical field [0001] The invention belongs to the technical field of building material concrete, in particular to a modified recycled coarse aggregate, permeable water-storage concrete and a preparation method thereof. Background technique [0002] The pavement of ordinary pavement structure is too compact and the water permeability is not good; on the other hand, these materials have a strong heat absorption capacity, which blocks the heat exchange and humidity adjustment between the soil and the surface, resulting in frequent high-temperature climates in cities due to the heat island effect . How to develop sponge city has become the focus of attention. [0003] At present, natural gravel is mainly used to prepare permeable concrete at home and abroad to solve the problem of insufficient water permeability of ordinary pavement, but the use of natural gravel also has environmental protection problems. Because the natural aggregate used in concrete is less and less, most...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/10C04B28/02C04B38/00C04B111/40
CPCC04B20/1077C04B28/02C04B2111/00284C04B2111/40C04B2201/50C04B18/16C04B2103/302C04B38/0038
Inventor 李晓光曹忍秦庆洋屈雅安
Owner CHANGAN UNIV
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