Strength and deformation characteristics of recycled concrete aggregate as a backfill material
Strength and deformation characteristics of recycled concrete aggregate as a backfill material
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DOI：
10.3208/sandf.45.5_53
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发表时间：
2005-10-01
影响因子：
3.7
通讯作者：
Matsushima, K
中科院分区：
文献类型：
--
作者：
Aqil, U;Tatsuoka, F;Matsushima, K
对再生混凝土骨料进行了一系列固结排水三轴压缩试验，以研究其作为要求高稳定性的岩土工程结构的回填材料的可行性，同时允许有限的变形，例如路堤和传统类型的土工合成增强土挡土墙支持公路和铁路。实验结果表明：在最佳含水率w（opt）附近，压实后的抗压强度q（max）与等级最高的典型级配砂砾土的抗压强度相似。在相同的能量水平下，当压实良好时，再生混凝土骨料的峰值强度和峰前刚度对模态含水量相对w（opt）的变化不敏感。在w（opt）附近良好压实时，围压对qmax的影响与典型的分级良好的砾石土相似，而封闭饱和对q（max）和峰前刚度没有不利影响。在给定的压实能量水平下，压实干密度从固定含水量下的最大干密度w（opt）左右下降，q（max）和峰前刚度以非常高的速率下降。再生混凝土骨料的黏性与普通类型的回填材料相似。当在w（opt）附近压实时，持续和循环加载的残余应变不显著。
A series of consolidated drained triaxial compression tests were performed on recycled concrete aggregates to investigate the feasibility of their use as a backfill material for geotechnical engineering structures requiring a high stability while allowing a limited amount of deformation, such as embankments and conventional type and geosynthetic-reinforced soil retaining walls supporting highway and railway. The experimental results showed the following. The compressive strength q(max) when well compacted at water content in the vicinity of the optimum water content w(opt) is similar to that of typical well graded gravelly soil that is categorized as the highest class backfill material. When well compacted at the same energy level, the peak strength and pre-peak stiffness of recycled concrete aggregate is insensitive to changes in the moulding water content relative to w(opt). When well compacted around w(opt) the effect of confining pressure on qmax is similar to the one of typical well graded gravelly soil, while confined saturation does not have any detrimental effects on the q(max) and pre-peak stiffness. With a decrease in the compacted dry density from the maximum dry density at fixed water content around w(opt) for a given compaction energy level, the q(max) and pre-peak stiffness decreases at a very high rate. The viscous property of the recycled concrete aggregate is similar to the one of ordinary type backfill materials. When well compacted around w(opt) residual strains by sustained and cyclic loading are not significant.