建筑垃圾骨料-粗粉煤灰基胶结料充填体力学性能试验研究
Experimental Study on Physical Properties of Construction Waste Aggregate - coarse fly ash - based Cement Filling
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摘要: 为分析建筑垃圾骨料-粗粉煤灰基胶结料充填体的力学性能,采用正交试验确定充填体的最优配比,进行单轴压缩、三轴压缩试验。结果表明:28 d的充填体的弹性模量平均为971 MPa,泊松比平均为0.028 99,黏聚力为0.932 MPa,内摩擦角为41.23°,表明充填体承载压缩变形过程中横向变形量较小,内部具有一定的压实形变空间。通过试件的常规三轴压缩试验表明,充填体在三向受力条件下表现出明显的塑性强化特征。Abstract: To analyze the mechanical properties of construction waste aggregate-coarse fly ash-based cement fillers, orthogonal test is used to determine the optimal proportion of cemented paste backfill, and uniaxial compression, triaxial compression test are carried out. The results show that the average elastic modulus of cemented paste backfill is 971 MPa, the average Poisson’s ratio is 0.028 99, the cohesion force is 0.932 MPa, and the internal friction angle is 41.23° on the 28 d, which indicates that the transverse deformation of the cemented paste backfill is small during the compression deformation process. The interior has a certain compaction deformation space. Through the conventional triaxial compression test of the specimen, it is shown that the cemented paste backfill shows obvious plastic strengthening characteristics under three-dimensional stress conditions.
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