再生细粉对混凝土收缩开裂性能影响  

INFLUENCE OF RECYCLED FINE POWDER ON SHRINKAGE CRACKING OF CONCRETE

作　　者：王花[1,2] 夏云[1] 

机构地区：[1]泰州职业技术学院,江苏泰州225300 [2]同济大学先进土木工程材料教育部重点实验室,上海201804

出　　处：《工业建筑》2016年第1期122-125,104,共5页Industrial Construction

摘　　要：对废弃混凝土进行破碎、研磨制备再生细粉掺合料。研究不同研磨时间(60,90,120 min)再生细粉(XF60、XF90、XF120)细度、粒度分布等物理性能及活性,并分别采用圆环试验法和平板试验法研究掺有再生细粉混凝土的收缩趋势和早期开裂性能。试验结果表明:3种细粉均满足掺合料物理性质和活性基本要求,其中XF90物理性能及活性最优。再生细粉掺合料能降低混凝土收缩和开裂趋势,XF90对混凝土抗收缩开裂性能改善作用最明显。Waste concrete was crushed and milled to prepare recycled fine powder admixture. Physical properties such as fineness,particle size distribution etc. and activity of recycled fine powder（ XF60,XF90,XF120） milled for different time（ 60 min,90 min,120 min,respectively） were studied. Ring test method and flat plate test method were used to test early age cracking tendency of recycled fine powder concrete. Test results showed that the three kinds of powders could meet the basic requirements of physical properties and activity of admixture. XF90 showed the optimal physical performance and activity. Recycled fine powder admixture could reduce concrete shrinkage cracking tendency,of which XF90 played the most obvious role.

关 键 词：再生细粉 混凝土 收缩 开裂 

分 类 号：TU528[建筑科学—建筑技术科学]