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Stiffness of a recycled composite aggregate

机译：再生复合骨料的刚度

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Recycled concrete aggregate (RCA) is a promising substitute for natural aggregates and the reuse of this demolished material would benefit the construction projects both economically and environmentally. A difficulty associated with the prediction of the behavior of RCA is because of its multi-composition which is linked to the grain size in consideration. In this study, a comprehensive laboratory testing program is conducted on different fractions of RCA for which the ratio of silicon over calcium increases for the coarser fractions due to the limitation of the cement mortar inclusion as the mean size increases. The study incorporates bender/extender element tests capturing small-strain constrained moduli, Young's moduli and Poisson's ratio of RCA fractions with different mean grain size and grain size distribution. For the uniform RCA fractions, the results showed that during isotropic compression, the specimens had a clear dependency of their dynamic properties on mean grain size. For the better graded specimens, it was shown that their behavior was dominated to some extend by the finer fraction they were composed rather than being affected equally by the different fractions they consisted of. The results also highlighted the sensitivity of the behavior of the samples to the over-consolidation stress history. For RCA, a multi-composition material, the grain size has a dominant role on the modulus - pressure relationship as well as the sensitivity of material behavior to stress history and these observations must be considered in the analysis of geo-structures where RCA is used as construction material.
机译：再生混凝土骨料（RCA）是天然骨料的有前途的替代品，这种已拆除材料的再利用将在经济和环境方面使建筑项目受益。与RCA的行为预测相关的困难是由于RCA的多元组成与所考虑的晶粒尺寸有关。在这项研究中，对RCA的不同馏分进行了全面的实验室测试，由于水泥砂浆夹杂物的限制，随着平均粒度的增加，硅与钙的比例在较粗的馏分中增加。这项研究结合了弯曲器/扩展器元素测试，可以捕获具有不同平均晶粒尺寸和晶粒尺寸分布的RCA分数的小应变约束模量，杨氏模量和泊松比。对于均匀的RCA分数，结果表明在各向同性压缩过程中，试样的动态特性对平均晶粒尺寸有明显的依赖性。对于分级更好的标本，结果表明，它们的行为在一定程度上受组成较细的分数的支配，而不是受到组成不同的分数的同等影响。结果还强调了样品行为对超固结应力历程的敏感性。对于RCA（一种多成分材料），晶粒尺寸在模量-压力关系以及材料行为对应力历史的敏感性方面起着主要作用，在使用RCA的地质结构分析中必须考虑这些观察结果作为建筑材料。

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