压碎值指标对再生混凝土抗压强度的影响  

INFLUENCE OF CRUSH VALUE INDEX ON COMPRESSIVE STRENGTH OF RECYCLED AGGREGATE CONCRETE

作　　者：张博[1] 王社良[2] 杜园芳[2,3] 景龙平[2] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [2]西安建筑科技大学土木工程学院,西安710055 [3]中国煤炭地质总局航测遥感局,西安710054

出　　处：《工业建筑》2013年第11期1-6,共6页Industrial Construction

基　　金：国家自然科学基金重大研究计划项目(90715003);国家自然科学基金项目(10972168);西部建筑科技国家重点实验室开放项目(08KF02;09KF05;09KF06);陕西省社发攻关项目(2010K01-127);中国煤炭地质总局航测遥感局科技创新基金项目;西北农林科技大学博士科研启动基金项目(2012BSJJ005);基本科研业务费专项资金项目(QN2013050)

摘　　要：采用来源于不同场地的废弃混凝土制备了3种不同的再生骨料，进行了8组饱和面干状态和气干状态下的压碎值指标试验。通过试验研究并对比国内外学者研究成果，结果表明：再生骨料的压碎值指标高于天然骨料的2．0倍～2．5倍，饱和面干状态比气干状态的压碎值指标高7．22％～18．20％。在此基础上，通过26组抗压强度试验研究不同来源骨料在不同取代率下抗压强度的变化规律。试验结果表明，由于骨料基材较大的变异性使得试验结果差异较大甚至截然相反。为探索骨料强度与抗压强度之间的关系，对比分析了12组气干状态和饱和面干状态下压碎值指标对抗压强度的影响。经过最小二乘法拟合并对拟合结果分析表明：随骨料压碎值指标的增加，骨料强度的降低，再生混凝土的抗压强度并不一定降低。Crush value index is a key parameter for measurement of coarse aggregate strength performance. In this paper eight groups of crush value indexes were tested for the recycled aggregate made of waste concrete gathered from three different removed construction plants. Through the experiment research and combined with comparison of research results of domestic and foreign scholars, the results show that the crush value index of recycled aggregate is 2 - 2. 5times greater than that of nature aggregate. Meanwhile the crush value index of saturated face dry state is increased by 7.22% - 18.20% as compared with that in air dried condition. Based on which twenty-six groups of compression strength tests were carried out to research the regularity for change in compressive strength of aggregate from can different source and different replacement rate. The testing result is presented that the recycled aggregate has larger variability, which makes test results differ greatly or be poles apart. For the exploration of relation between aggregate strength and recycled concrete compression strength, the twelve groups of specimens were comparatively analysed in air dried and saturated face dry condition. The least square fitting and result analysis show that the compression strength of RAC may not always be decreased with increase in crush value index and decrease in strength of the aggregate.

关 键 词：再生骨料 压碎值指标 再生混凝土 抗压强度 

分 类 号：TU528[建筑科学—建筑技术科学]