Influences of Brick-Concrete Coarse Aggregate Gradation and Content on Properties of Cement Stabilized Materials

doi:10.16552/j.cnki.issn1001-1625.2025.0808

Abstract

Abstract: Improving the resource utilization of construction waste is of great significance for reducing environmental load and promoting the development of green building materials. In this paper, the comprehensive performance of cement stabilized materials was improved by optimizing the gradation and content of brick-concrete coarse aggregate. The effects of single-size gradation (S), binary-size gradation (B), triple-size gradation (T) and relative volume fraction (34.7%~68.4%) of brick-concrete coarse aggregate on the mechanical properties, volume stability and water stability of cement stabilized materials were studied. The results show that the 7 d unconfined compressive strength of cement stabilized materials prepared with triple-size gradation (T) brick-concrete coarse aggregate consistently is above 4.0 MPa, and the dry shrinkage coefficient at 31 d is as low as 31.0×10^-6/%. When the relative volume fraction of brick-concrete coarse aggregate is 54.7%, the cement stabilized materials exhibit the best overall performance, with a 7 d unconfined compressive strength of 4.1 MPa and a 28 d water stability coefficient of 78.7%. Optimizing the aggregate gradation enhances the mechanical interlocking between neighboring coarse aggregates, thereby improving the mechanical properties of the cement stabilized materials.The relative volume fraction of brick-concrete coarse aggregate determines the skeleton structure of the cement stabilized materials, and comprehensive performance of cement stabilized materials with skeleton-dense structure is the best. These findings provide theoretical basis and technical guidance for the mix proportion design optimization of recycled cement stabilized materials.

Key words: brick-concrete coarse aggregate, cement stabilized material, mechanical property, volume stability, water stability, skeleton structure

CLC Number:

TU528.37

CHEN Hengwu, DU Junpeng, WANG Hongtai, ZENG Siqing, YANG Donglai, ZHANG Tongsheng, WEI Jiangxiong, YU Qijun. Influences of Brick-Concrete Coarse Aggregate Gradation and Content on Properties of Cement Stabilized Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(11): 4092-4102.

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