The Mixture Proportioning Design of Sand-containing Pervious Concrete Based on Mortar Thickness of Recycled Coarse Aggregate

被引：0
|
作者：
Yang L. [1 ]
Song X. [1 ]
Lu M. [2 ,3 ]
Xia Y. [2 ,3 ]
机构：
[1] School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai
[2] Research Institute of Building Materials and Solid Waste Recycling, Shanghai Research Institute of Building and Science Co., Ltd., Shanghai
[3] Shanghai Engineering Technology Research Center of Industrial Solid Waste Recycling, Shanghai
来源：
Cailiao Daobao/Materials Reports | 2022年 / 36卷 / 04期
关键词：
Mixture proportioning design; Mortar thickness of aggregate; Pervious concrete with sand; Recycled coarse aggregate;
D O I：
10.11896/cldb.21020037
中图分类号：
学科分类号：
摘要：
The effects of additive content on the fluidity of cementitious paste under different W/B ratio were studied, and ementitious paste fluidity, sand/paste mass ratio on the mortar thickness of RCA were experimentally investigated. Two mathematical correlation models were established, which were the fluidity of cementitious paste and the dosage of admixture, the mortar thickness on RCA, and cementitious paste fluidity and the mass ratio of sand to cementitious paste. The two mathematical correlation models were applied to the mix design of pervious concrete. The results show that the thickness of recycled coarse aggregate coating mortar increases with the decrease of fluidity of mortar, and the larger the size of recycled coarse aggregate is, the greater the coating thickness is. The recycled aggregate RCA-9.5 was used to prepare sand-containing pervious concrete. The mortar paste can stably wrap the coarse aggregate, and there are no problems such as slurry leakage, bottom sea-ling, exposed frame etc. The 28 d compressive strength and 28 d flexural strength of concrete specimen are 14.1-17.1 MPa and 2.0-2.7 MPa, respectively. The permeability coefficient is greater than 6 mm•s-1, and the concrete specimen has good frost resistance and wear resistance. © 2022, Materials Review Magazine. All right reserved.
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