Influence of amount of recycled coarse aggregates and production process on properties of recycled aggregate concrete
Influence of amount of recycled coarse aggregates and production process on properties of recycled aggregate concrete
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DOI：
10.1016/j.cemconres.2007.02.002
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发表时间：
2007-05-01
影响因子：
11.4
通讯作者：
Barra, M.
中科院分区：
文献类型：
--
作者：
Etxeberria, M.;Vazquez, E.;Barra, M.
本研究将混凝土破碎后得到的再生粗骨料用于混凝土生产。生产了四种不同的再生骨料混凝土;分别用0%、25%、50%和100%的再生粗骨料制成。设计了四种混凝土的配合比，以达到相同的抗压强度。在潮湿条件下使用未饱和骨料，以控制其新拌混凝土性能、有效水灰比和较低的强度变异性。从水泥用量的要求出发，论证了生产中低抗压强度再生混凝土的必要性。分析了再生骨料混凝土生产中材料使用顺序对提高其劈裂抗拉强度的影响。测定了再生粗骨料混凝土相对于常规混凝土的较低弹性模量，验证了几位研究人员提出的数值模型。(C)2007爱思唯尔有限公司版权所有。
in this study recycled coarse aggregates obtained by crushed concrete were used for concrete production. Four different recycled aggregate concretes were produced; made with 0%, 25%, 50% and 100% of recycled coarse aggregates, respectively. The mix proportions of the four concretes were designed in order to achieve the same compressive strengths. Recycled aggregates were used in wet condition, but not saturated, to control their fresh concrete properties, effective w/c ratio and lower strength variability. The necessity to produce recycled aggregate concrete with low-medium compressive strength was verified due to the requirement of the volume of cement. The influence of the order of materials used in concrete production (made with recycled aggregates) with respect to improving its splitting tensile strength was analysed. The lower modulus of elasticity of recycled coarse aggregate concretes with respect to conventional concretes was measured verifying the numeral models proposed by several researchers. (C) 2007 Elsevier Ltd. All rights reserved.