Effect of Mixed Recycled Sand Powder on Frost Resistance and Dry Shrinkage of Cement-Stabilized Aggregates

Abstract

Abstract: Construction solid waste can now be recycled and used in a more environmentally friendly manner by utilizing the sand powder created during the process of crushing it into recycled aggregate. This recycled sand powder has beneficial filling and volcanic ash effects. In this study, mixed recycled sand powder (recycled composite micronized powder, recycled fine aggregate), and recycled coarse aggregate were produced using discarded bricks and concrete as raw materials. The study examined the effect of mixed recycled sand powder on the durability of cement-stabilized aggregates. The ideal composition of mixed recycled sand powder was determined using the orthogonal test method, along with indoor compaction tests, freeze-thaw tests, and dry shrinkage tests. The influence mechanism of mixed recycled sand powder on the durability of cement-stabilized aggregates was revealed using scanning electron microscope (SEM) in conjunction with energy spectrum analysis. The results show that the compressive strength loss of specimens after freeze-thaw cycle is smaller than that of benchmark specimen, with a maximum decrease of 11.63%, and the maximum increase of dry shrinkage strain is 69.75%. Mixed recycled coarse aggregate has the most significant impact on the optimal moisture content and frost resistance of cement-stabilized aggregates. Mixed recycled fine aggregate reduces the deformation resistance of specimen and has a significant effect on its dry shrinkage. Mixed recycled sand powder can effectively improve the density of mixture. The volcanic ash effect reduces the Ca/Si ratio of specimens by 52.83%. Variance analysis identifies that the ideal replacement amount of mixed recycled composite micronized powder, recycled fine aggregate, and recycled coarse aggregate is 40%, 20%, and 40% (mass fraction), respectively. These research findings can serve as a guide for recycled materials in the base layer of cement-stabilized aggregates used in road construction.

Key words: recycled sand powder, cement-stabilized aggregate, orthogonal test, dry shrinkage, frost resistance, compaction test

CLC Number:

U414

XIE Xiangbing, SIMA Xiaoqing, ZHANG Yilin, WANG Kaiwei, JIANG Bingyang, LIU Chenchen, LI Guanghui. Effect of Mixed Recycled Sand Powder on Frost Resistance and Dry Shrinkage of Cement-Stabilized Aggregates[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(11): 4051-4062.

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