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Recycled concrete prepared from waste building concrete and preparation method thereof

A technology for recycled concrete and building concrete, applied in the field of building materials, can solve the problems of poor impermeability of recycled concrete, and achieve the effects of improving impermeability, impermeability and gap filling rate.

Active Publication Date: 2021-06-25
广州市长运预拌混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned related technologies, the inventor believes that the impermeability of recycled concrete is not good and needs to be further improved

Method used

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  • Recycled concrete prepared from waste building concrete and preparation method thereof
  • Recycled concrete prepared from waste building concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A recycled concrete prepared by using waste building concrete, including cementitious material, coarse aggregate, fine aggregate, magnesium sulfate, lithium carbonate, sodium sulfate, potassium dihydrogen phosphate, and water.

[0059] The cementitious materials are China Resources PII42.5R cement and Everbright P.042.5R cement, S95 grade slag, and II grade fly ash.

[0060] Coarse aggregate is waste building concrete.

[0061] The fine aggregate is river sand, and the fineness modulus of river sand is 2.4.

[0062] This embodiment also discloses a method for preparing recycled concrete prepared from waste building concrete, which includes the following steps:

[0063] Step 1) put 900kg of waste building concrete into a pulverizer, stir at a speed of 600r / min, pulverize for 10min, clean, and sieve with a sieving particle size of 25mm to obtain recycled aggregate;

[0064] Step 2) Put the regenerated aggregate into the mixer, add 20kg of magnesium sulfate, 30kg of lith...

Embodiment 2

[0067] Compared with Example 1, the difference is only in:

[0068] Step 2) in, the addition of magnesium sulfate is 22kg, and the addition of lithium carbonate is 31kg, and the addition of sodium sulfate is 17kg, and the addition of potassium dihydrogen phosphate is 17kg.

Embodiment 3

[0070] Compared with Example 1, the difference is only in:

[0071] Step 2) in, the addition of magnesium sulfate is 32kg, and the addition of lithium carbonate is 33kg, and the addition of sodium sulfate is 19kg, and the addition of potassium dihydrogen phosphate is 19kg.

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Abstract

The invention relates to the technical field of building materials, and particularly discloses recycled concrete prepared from waste building concrete and a preparation method of the recycled concrete. The recycled concrete prepared from the waste building concrete comprises a cementing material, coarse aggregate, fine aggregate, magnesium sulfate, lithium carbonate, sodium sulfate, monopotassium phosphate and water. The coarse aggregate at least comprises waste building concrete. The preparation method comprises the following steps: 1) crushing, cleaning and screening the waste building concrete to obtain recycled aggregate; 2) mixing the recycled aggregate with magnesium sulfate, lithium carbonate, sodium sulfate and monopotassium phosphate to obtain a mixture; and 3) mixing the mixture with the cementing material, the coarse aggregate, the fine aggregate, the additive, the synergist and water to obtain the recycled concrete prepared from the waste building concrete. According to the recycled concrete prepared from the waste building concrete, gaps of recycled aggregate can be filled to a large extent, the impermeability of the concrete is improved, and meanwhile, the recycled concrete has good crack resistance.

Description

technical field [0001] The application relates to the technical field of building materials, more specifically, it relates to recycled concrete prepared from waste building concrete and a preparation method thereof. Background technique [0002] At present, with the rapid development of the economy, urban buildings are constantly being updated and iterated, and a large number of buildings are demolished. As a result, a large amount of construction waste will be generated. Due to the increasing accumulation of urban construction waste, it will have an impact on the daily environment. At the same time, in the process of urban construction, new resources need to be continuously mined, which will also have an impact on the environment due to the exploitation of resources. Therefore, it is necessary to sort out and recycle the construction waste after the demolition of waste buildings. The concrete can be reused as concrete aggregate. [0003] The demolished waste buildings are ...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B24/32C04B103/30C04B111/27C04B18/16C04B22/14C04B22/10C04B22/16
CPCC04B28/04C04B40/0039C04B2103/302C04B2111/27C04B18/141C04B18/08C04B18/16C04B14/068C04B22/142C04B22/10C04B22/147C04B22/16C04B24/20C04B24/32C04B22/14Y02W30/91
Inventor 陈楚彬黄森儒欧火辉陈光锋
Owner 广州市长运预拌混凝土有限公司