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Pavement concrete and preparation method thereof

A technology of concrete and air-entrained concrete, which is applied in the field of comprehensive recycling of waste air-entrained concrete, which can solve problems such as decline in mechanical properties, pollution of soil and water resources, increase of waste air-entrained concrete, etc., and achieve strong reproducibility and operability strong effect

Pending Publication Date: 2021-08-20
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the building has reached its service life, demolition of the walls will produce a large amount of waste air-entrained concrete; in addition, due to the low strength of the air-entrained concrete itself, it will also be damaged to varying degrees during production and transportation, which leads to waste Air-entrained concrete further increases
At present, the disposal methods of waste aerated concrete at home and abroad are mainly simple backfilling and accumulation and used to prepare masonry mortar. Simple backfilling and accumulation not only occupy a large amount of land resources, but also cause pollution to soil and water resources. At the same time, due to its porosity High rate and light density, improper landfill will cause potential risks to the safety and stability of the landfill; using waste aerated concrete to prepare concrete has the problem of declining mechanical properties

Method used

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  • Pavement concrete and preparation method thereof
  • Pavement concrete and preparation method thereof
  • Pavement concrete and preparation method thereof

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preparation example Construction

[0025] The invention provides a kind of preparation method of pavement concrete, comprises the following steps:

[0026] Crushing and grading waste aerated concrete in sequence to obtain recycled fine aggregate of waste aerated concrete;

[0027] Pre-wetting the regenerated fine aggregate of waste aerated concrete to obtain pre-wet fine aggregate;

[0028] The pavement concrete is obtained by mixing the pre-wet fine aggregate, cement, gravel, river sand and water.

[0029] In the present invention, unless otherwise specified, the raw materials used are all commercially available products in this field.

[0030] The invention sequentially crushes and classifies the waste aerated concrete to obtain recycled fine aggregate of the waste aerated concrete.

[0031] In the present invention, the particle size of the recycled fine aggregate of waste aerated concrete is preferably 0.16-4.75 mm.

[0032] In the present invention, the waste air-entrained concrete is preferably sorted ...

Embodiment 1

[0048] Firstly, the waste air-entrained concrete is sorted out from the construction waste, and the cement mortar attached to the air-entrained concrete block is removed; then the jaw crusher is used for crushing; and then the broken air-entrained concrete obtained is classified by a vibrating screen. The waste air-entrained concrete regenerated fine aggregate with a particle size between 0.16mm and 4.75mm was screened out.

[0049] figure 2 It is the physical figure of river sand in embodiment 1, image 3 It is the physical picture of the recycled fine aggregate of waste aerated concrete in Example 1, and Table 1 is a comparison of the physical properties of river sand and recycled fine aggregate of waste aerated concrete.

[0050] Table 1 Comparison of physical properties between river sand and recycled fine aggregate of waste aerated concrete

[0051]

[0052]

[0053] Pre-wet the waste aerated concrete regenerated fine aggregate (mass water absorption rate is 35%)...

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Abstract

The invention provides pavement concrete as well as a preparation method and application thereof, and belongs to the field of comprehensive recycling of waste aerated concrete. As waste aerated concrete recycled fine aggregate is loose and porous and has very strong water absorption, pre-wetted fine aggregate in a saturated surface dry state is obtained by pre-wetting in advance, it can be ensured that the slump is within a reasonable range, and the result shows that the pre-wetted waste aerated concrete particles have an internal curing effect under the condition that other factors are not changed, on the basis of ensuring the construction performance of the pavement concrete, the mechanical property, wear resistance and the like of the pavement concrete meet related requirements, and compared with the performance of a control group (pavement concrete not replaced by waste aerated concrete), the performance of the pavement concrete is not greatly reduced, and engineering practice can be guided.

Description

technical field [0001] The invention relates to the technical field of comprehensive recycling of waste aerated concrete, in particular to a pavement concrete and a preparation method thereof. Background technique [0002] Due to the advantages of light weight and good thermal insulation performance, the proportion of aerated concrete in wall materials is gradually increasing, and it plays an important role in building energy saving and innovation of wall materials. However, when the building has reached its service life, demolition of the walls will produce a large amount of waste air-entrained concrete; in addition, due to the low strength of the air-entrained concrete itself, it will also be damaged to varying degrees during production and transportation, which leads to waste Air-entrained concrete increases further. At present, the disposal methods of waste aerated concrete at home and abroad are mainly simple backfilling and accumulation and used to prepare masonry mor...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/0075C04B2201/50
Inventor 邹笃建王玺崔巍刘铁军郭宇航周傲李烨张绍栋
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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