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低品位全珊瑚骨料混凝土的力学性能及耐久性能研究
作者：周文1，2，周永祥1，3，宋普涛1，3，冯鹏2，王祖琦1，3，王晶1，3
（1.中国建筑科学研究院有限公司，北京 100013；2.清华大学，北京 100084；
3.建筑安全与环境国家重点实验室，北京 100013）
摘要：采用筒压强度为3.72 MPa的低品位珊瑚骨料配制LC30及LC50全珊瑚骨料混凝土，研究了低品位全珊瑚骨料混凝土的基本力学性能及耐久性能。结果表明：与火山渣轻骨料混凝土、普通混凝土相比，珊瑚骨料混凝土的fc/fcu显著偏大，劈裂抗拉强度比火山渣轻骨料混凝土提高20%~30%，与普通混凝土基本持平，弹性模量介于普通混凝土与火山渣轻骨料混凝土之间；珊瑚骨料混凝土3 d收缩率仅为普通混凝土的43%，约为火山渣轻骨料混凝土的111%；抗氯离子渗透性次于普通混凝土而优于火山渣轻骨料混凝土，护筋性能不如普通混凝土。
关键词：低品位珊瑚骨料混凝土；普通混凝土；火山渣轻骨料混凝土；力学性能；耐久性
中图分类号：TU528.2 文献标识码：A 文章编号：1001-702X（2019）12-0021-04
Research on mechanical properties and durability of low-grade coral concrete
ZHOU Wen1，2，ZHOU Yongxiang1，3，SONG Putao1，3，FENG Peng2，WANG Zuqi1，3，WANG Jing1，3
（1.China Academy of Building Research，Beijing 100013，China，2.Tsinghua University，Beijing 100084，China，
3.State Key Laboratory of Building Safety and Environment，Beijing 100013，China）
Abstract：LC30 and LC50 concrete were prepared with low-grade coral aggregate with a cylinder crushing strength of 3.72 MPa. Mechanical properties and durability of low-grade coral concrete are systematically studied. The results showed that compared with volcanic slag lightweight aggregate concrete and ordinary concrete，the fc/fcu ratio of coral concrete is significantly larger；the splitting tensile strength fsp is higher than that of the volcanic slag lightweight aggregate concrete，which is basically the same as the ordinary concrete；the elastic modulus of coral concrete is between that of ordinary concrete and volcanic slag lightweight aggregate concrete；the shrinkage of coral concrete is only 43% of that of ordinary concrete and 111% of that of volcanic slag concrete；the resistance to chloride of coral concrete is inferior to ordinary concrete and superior to volcanic slag concrete，therefore its performance of steel-protection is not as good as ordinary concrete.
Key words：low-grade coral concrete，ordinary concrete，volcanic slag lightweight aggregate concrete，mechanical property，durability