The Mixture Proportioning Design of Sand-containing Pervious Concrete Based on Mortar Thickness of Recycled Coarse Aggregate
YANG Lixiang1, SONG Xingfu1,*, LU Meirong2,3, XIA Yuehui2,3
1 School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China 2 Research Institute of Building Materials and Solid Waste Recycling, Shanghai Research Institute of Building and Science Co., Ltd., Shanghai 201108, China 3 Shanghai Engineering Technology Research Center of Industrial Solid Waste Recycling, Shanghai 201108, China
Abstract: 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.
杨利香, 宋兴福, 陆美荣, 夏月辉. 基于再生粗骨料裹浆厚度的含砂透水混凝土配合比设计方法[J]. 材料导报, 2022, 36(4): 21020037-7.
YANG Lixiang, SONG Xingfu, LU Meirong, XIA Yuehui. The Mixture Proportioning Design of Sand-containing Pervious Concrete Based on Mortar Thickness of Recycled Coarse Aggregate. Materials Reports, 2022, 36(4): 21020037-7.
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2022, Vol. 36 
