Effect of Curing Conditions on the Durability of Ultrahigh Performance Concrete under Flexural Load

被引：20
作者：
Gu Chunping [1 ,2 ]
Sun Wei [1 ,2 ,3 ]
Guo Liping [1 ,2 ,3 ]
Wang Qiannan [1 ,2 ]
机构：
[1] Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Jiangsu, Peoples R China
[2] Jiangsu Key Lab Construct Mat, Nanjing 211189, Jiangsu, Peoples R China
[3] Collaborat Innovat Ctr Adv Civil Engn Mat, Nanjing 211189, Jiangsu, Peoples R China
来源：
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION | 2016年 / 31卷 / 02期
基金：
中国国家自然科学基金;
关键词：
UHPC; curing condtions; durability; flexural load; microstructure; MECHANICAL-PROPERTIES; STRENGTH;
D O I：
10.1007/s11595-016-1365-0
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We experimentally investigated the effect of curing conditions on the durability of UHPC under flexural load. Moreover, the mechanisms of the effect of curing conditions were revealed from the microstructural point of view with environmental scanning electron microscopy (ESEM) and X-ray computerized tomography (X-ray CT). The experimental results show that the flexural load has negative influence on the durability of UHPC, but UHPC still exhibits excellent durability under flexural load. Besides, the curing conditions do show influences on the durability of UHPC. Compared with standard and steam curing, oven curing led to a lower chloride resistance and freeze-thaw performance of UHPC. The microstructure of UHPC paste was detected with ESEM. It is revealed that, compared with standard and steam cured UHPC, the lower reaction degree and internal microcracks are the causes for the lower chloride resistance of oven cured UHPC. The defects distribution in UHPC before and after freeze-thaw action was investigated with X-ray CT. The number of defects in oven cured UHPC increases the fastest during the freeze-thaw action due to its more defective microstructure
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页码：278 / 285
页数：8
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