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A kind of recycled concrete prepared by using waste building concrete and its preparation method

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

Active Publication Date: 2022-06-03
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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  • A kind of recycled concrete prepared by using waste building concrete and its preparation method
  • A kind of recycled concrete prepared by using waste building concrete and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A recycled concrete prepared by using waste and old building concrete comprises 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 mineral powder and II grade fly ash.

[0060] The coarse aggregate is waste construction concrete.

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

[0062] The present embodiment also discloses a method for preparing recycled concrete prepared by using waste building concrete, comprising the following steps:

[0063] Step 1) throwing 900kg of waste construction concrete into a pulverizer, stirring, with a rotating speed of 600r / min, pulverizing for 10min, cleaning, and sieving, and the sieving particle size is 25mm to obtain regenerated aggregate;

[0064] Step 2) put the regenerate...

Embodiment 2

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

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

Embodiment 3

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

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

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Abstract

The application relates to the technical field of building materials, and specifically discloses recycled concrete prepared from waste building concrete and a preparation method thereof. The recycled concrete prepared by utilizing waste and old building concrete includes cementitious material, coarse aggregate, fine aggregate, magnesium sulfate, lithium carbonate, sodium sulfate, potassium dihydrogen phosphate and water; the coarse aggregate includes at least waste and old building concrete; its preparation method is : step 1) crushing waste building concrete, cleaning, and screening to obtain recycled aggregate; step 2) mixing recycled aggregate with magnesium sulfate, lithium carbonate, sodium sulfate, and potassium dihydrogen phosphate to obtain a mixture; step 3 ) mixing the mixture with cementitious material, coarse aggregate, fine aggregate, admixture, synergist and water to obtain recycled concrete prepared from waste building concrete. The recycled concrete prepared by using the waste building concrete of the present application can fill the gaps of the recycled aggregate to a large extent, increase the impermeability of the concrete, and have good crack resistance at the same time.

Description

technical field [0001] The present application relates to the technical field of building materials, and more particularly, to a recycled concrete prepared by using waste building concrete and a preparation method thereof. Background technique [0002] At present, with the rapid development of the economy, the buildings in the city are constantly updated and iterative, and a large number of buildings have been demolished. As a result, a large amount of construction waste will be generated. Due to the accumulation of urban construction waste, it will have an impact on the daily environment. At the same time, in the process of urban construction, it is necessary to continuously exploit new resources, which will also affect the environment due to the exploitation of resources. Therefore, it is necessary to sort out and recycle the construction waste after the demolition of the old buildings. The concrete can be re-used as concrete aggregate. [0003] The dismantled waste build...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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