An important way to recycle construction waste is to use waste brick aggregates as the filler in the production practice of geotechnical engineering. Therefore, it is of positive and practical engineering significance to determine the optimal grain group of waste brick aggregates, under the premise of clarifying the crushing mechanism of waste brick aggregates. This paper firstly experimentally reveals the gap opening features of waste bricks through crushing, as well as the change law of aggregate grading during filler compaction. On this basis, the crushing mechanism of waste brick aggregates was expounded, and the optimal crushing grain group was defined and determined. The results show that: During the crushing of waste brick aggregates, the gaps of different scales gradually opened, with the decrease of aggregate size. The waste brick aggregates underwent two stages: gap opening, and grain rounding. The former stage increased the bulk density, while the latter stage reduced the bulk density. When brick aggregates serve as filler, the coarser the aggregates, the greater the compaction energy, the higher the construction-induced secondary damage rate, the better the grading. When waste brick aggregates are taken as filler, it is necessary to fully consider the material features of waste bricks and the magnitude of compaction energy, and to identify the optimal crushing grain group through our experimental approach.
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