摘要
针对不同种类的再生混凝土集料具有不同材质、表面性能、密实度等特性,采用嵌挤骨架密实法对再生混凝土配合比设计方法进行研究。以再生集料振动堆积密实度、富浆系数、浆集比分别确定再生混凝土的集料用量和胶凝材料用量,进行了4种不同的再生集料的混凝土试配实验。结果表明,对于不同种类的再生集料配制再生混凝土时,采用浆集比计算胶凝材料的用量比采用富浆系数计算具有更好的适应性。在该试验条件下,配制C40再生混凝土浆集比取0.49左右为宜,其坍落度和28 d抗压强度分别达到155 mm和52 MPa以上。
The mix proportion design method of recycled concrete by close packing method of mechanically interlocked skeleton was studied, aiming at the various qualities of materials, surface properties and compact degree of recycled concrete aggregates （RCA） from different kinds. The proportion tests of four different kinds of RCA as the aggregate were carried out with the amount determination of RCA and cementing materials by close packing degree of RCA, and mortar-aggregate ratio respectively. It was found that the amount of cementing materials determinated by mortar-aggregate ratio was more appropriate than that by rich-mortar coefficient. In the testing condition, the preferable mortar aggregate ratio of C40 recycled concrete was near 0.49. And the slumps of the concretes and the 28 d compressive strengths reached at 155 mm and 52 MPa, respectively.
出处
《土木建筑与环境工程》
CSCD
北大核心
2009年第3期124-129,共6页
Journal of Civil,Architectural & Environment Engineering
基金
重庆市城乡建设委员会科技项目资助(2007第42号)
重庆大学重点实验室对本科生开放创新基金(ZDKF-CQU-2008-17)
重庆大学大型仪器设备开放基金项目(2008121515)
关键词
混凝土集料
再生混凝土
配合比设计
嵌挤骨架
密实法
concrete aggregates
recycled concrete
proportion design
mechanically interlocked skeleton
close packing method
