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A preparation method of recycled aggregate permeable concrete based on cement slurry wrapped aggregate

A technology of permeable concrete and recycled aggregates, applied in clay preparation devices, cement mixing devices, chemical instruments and methods, etc., can solve problems such as low pass rate, achieve strong operability, reasonable proportioning, and reduce pollution.

Active Publication Date: 2021-12-24
SHANGHAI RES INST OF BUILDING SCI CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no mature technical specification for recycled aggregate permeable concrete. The only applicable specification is the "Technical Regulations for the Application of Recycled Aggregate Pervious Concrete" CJJ / T 253-2016. This specification only provides water-binder ratio and The reasonable range of admixtures needs to be tried several times to obtain the optimal mix ratio in the way of increasing (decreasing) gradients, and the pass rate of one test is not high
In addition, there is no reference for the design method of recycled aggregate permeable concrete containing admixtures

Method used

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  • A preparation method of recycled aggregate permeable concrete based on cement slurry wrapped aggregate
  • A preparation method of recycled aggregate permeable concrete based on cement slurry wrapped aggregate

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Experimental program
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Effect test

Embodiment 1

[0032] The porosity of recycled aggregate permeable concrete is 46%, and the amount of recycled aggregate per unit volume is 1450kg / m 3 , the particle size of the recycled aggregate is 4.75-9.5mm, and the specific surface area of ​​a single recycled aggregate is 0.364m 2 / kg, the total surface area of ​​recycled aggregate is 528m 2 , when the design porosity is 20%, the silica fume content is 5%, and the design water-cement ratio is 0.27 and 0.33 respectively, find the theoretical mix ratio of recycled aggregate permeable concrete. (Raw materials used: Southern P·O42.5 cement, apparent density 3200kg / m 3 , Silica fume is Tiankai silica fume, the apparent density is 2100kg / m 3, the admixture is a polycarboxylate superplasticizer with a solid content of 20%. )

[0033] Specific steps are as follows:

[0034] Step 1: According to the maximum aggregate particle size requirement for preparing cement-based recycled aggregate permeable concrete, select the aggregate particle dia...

Embodiment 2

[0042] The porosity of recycled aggregate permeable concrete is 42%, and the amount of recycled aggregate per unit volume is 1550kg / m 3 , recycled aggregate with 40% 4.75-9.5mm (D 1 ) and 60% of 16-19mm (D 2 ) compound, the particle size is 4.75-9.5mm and the specific surface area is 0.364m 2 / kg, the total surface area is 226m 2 (S a1 ); the particle size is 16-19mm and the specific surface area is 0.133m 2 / kg, the total surface area is 124m 2 (S a2 ); when the design porosity is 20%, the silica fume content is 5%, and the design water-cement ratio is 0.29 and 0.35 respectively, find the theoretical mix ratio of recycled aggregate permeable concrete. (Raw materials used: Southern P·O42.5 cement, apparent density 3200kg / m 3 , Silica fume is Tiankai silica fume, the apparent density is 2100kg / m 3 , the admixture is a polycarboxylate superplasticizer with a solid content of 20%. )

[0043] Specific steps are as follows:

[0044] Step 1: According to the maximum aggre...

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Abstract

The invention discloses a preparation method of recycled aggregate permeable concrete based on cement slurry wrapping aggregate. On the basis of knowing the dense packing density, apparent density, porosity, total surface area and porosity of permeable concrete to be prepared of recycled aggregate, according to the mathematical relationship model between the surface thickness of recycled aggregate and the fluidity of cement paste, The mathematical relationship model between the fluidity of cement paste, the water-cement ratio, and the amount of admixture is used to calculate the amount of each component of recycled aggregate permeable concrete and determine its theoretical mix ratio. The invention has strong practicability and operability. The use of construction waste recycled aggregates to prepare permeable concrete not only reduces the pollution of construction waste to the environment, but also provides basic materials for the construction of sponge cities; in addition, the resource utilization of construction waste turns waste into treasure and creates economic benefits.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a preparation method of recycled aggregate permeable concrete based on aggregate wrapped in cement slurry. Background technique [0002] With the rapid development of my country's economy and the continuous acceleration of urbanization, the original natural vegetation and bare soil are gradually hardened and covered by water-blocking materials such as buildings and concrete. The compact ordinary concrete lacks breathability, heat absorption and rainwater penetration. The ability to seriously affect the urban ecology. Because of its large porosity and the characteristics that water can penetrate quickly through the pores, permeable concrete can be used to pave squares and roads, and it is good for rebuilding the "rainfall-runoff-infiltration-reuse / circulation" damaged by hardened ground. It is important to recycle and restore the urban environment. A large number of piles of con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28C5/00C04B18/16C04B20/10
CPCB28C5/003C04B20/1077C04B18/16Y02W30/91
Inventor 杨利香赵玉静陆美荣曹黎颖俞瑾宋兴福
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD