再生细骨料混凝土塑性收缩开裂性能试验研究  

Experimental research on plastic shrinkage cracking properties of recycled fine aggregate concrete

作　　者：车乘乘[1,2] 孙家瑛[1,2] 陈福旦[1,2] 

机构地区：[1]上海大学土木工程系,上海20072 [2]浙江大学宁波理工学院绿色建材与废弃物资源化研究中心,浙江宁波315100

出　　处：《混凝土》2012年第3期81-83,87,共4页Concrete

基　　金：科技部国际合作重大项目(2010FA24590);国家自然科学基金(50808160)

摘　　要：再生细骨料在实际工程中的使用为废弃混凝土提供了一条可持续化利用的道路,而由其配制的再生细骨料混凝土开裂性能直接影响了混凝土的使用寿命。该文参考ICBO标准,采用平板约束试验,重点讨论了再生细骨料替代率、水灰比、砂率对其塑性收缩开裂性能的影响,用图像处理技术对混凝土的裂缝进行分析,计算出开裂面积进行比较。结果表明:随着再生细骨料替代率的增加,再生混凝土开裂风险增大;水灰比对再生细骨料混凝土抗裂性能至关重要,过大或过小都不利于再生混凝土防裂;选择合适的砂率可以控制再生混凝土的开裂程度。Using recycled fine aggregate in the practical engineering provide for waste concrete a sustainable utilization road, and the cracking properties of recycled fine aggregate concrete immediately influence the service life of concrete.Consult ICBO standard, carry out stationary plank method, it put importance on the influences on the concrete, the replacement ratio of recycled fine aggregate ,water-cement ratio, sand percentage, deal with the images of cracking concrete, calculate the cracking area and comparative analysis.The result indicated that the risk decreased of recy- cled concrete with the increasing of placemcnt;watei＇ocement ratio is important on the anti-cracking pcn＇formance of recycled fine aggregate con- crete, much more or less does not good for anti-cracking of concrete;choose suitable sand percentage can control the degree of cracking of recycled concrete.

关 键 词：废弃混凝土 再生细骨料 开裂性能 图像处理 

分 类 号：TU528.041[建筑科学—建筑技术科学]