Restrained Shrinkage Mechanism of Ultra High Performance Concrete

被引：12
|
作者：
Wang, Jun-Yan [1 ]
Bian, Chen [1 ]
Xiao, Ru-Cheng [2 ]
Ma, Biao [3 ]
机构：
[1] Tongji Univ, Key Lab Adv Civil Engn Mat, Shanghai 201804, Peoples R China
[2] Tongji Univ, Coll Civil Engn, Shanghai 200092, Peoples R China
[3] Shanghai Municipal Engn Design Inst Grp Co Ltd, Shanghai 200092, Peoples R China
来源：
KSCE JOURNAL OF CIVIL ENGINEERING | 2019年 / 23卷 / 10期
关键词：
UHPC; restrained shrinkage mechanism; expansive agent; ASTM C1581-04 ring test; AE analysis method; FIBER-REINFORCED CONCRETE; DRYING SHRINKAGE; RESIDUAL-STRESS; CRACKING; UHPC; BEHAVIOR; UHPFRC;
D O I：
10.1007/s12205-019-0387-5
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The understanding and controlling of the restrained shrinkage is critical for the application of ultra high performance concrete (UHPC). This study made an analysis of restrained shrinkage mechanism of four kinds of UHPCs based on the direct tensile test accompanied with acoustic emission (AE) source location, free shrinkage test and restrained shrinkage test. The effects of UHPC tensile properties (strain softening or strain hardening) and high performance calcium sulphoaluminate (HCSA, a new kind of expansion agent) dosages (0%, 3% and 6% by mass of total binder) were investigated. The restrained shrinkage cracking mechanism of strain hardening UHPC and strain softening UHPC was analyzed based on AE analysis method under direct tensile loading. The results indicates that strain hardening UHPC shows multiple micro-defects to relax the restrained tensile stress marginally while strain softening UHPC shows several hairline cracks to relax the restrained tensile stress evidently. In ASTM C1581-04 ring test, the restrained shrinkage of strain hardening UHPC with HCSA dosage of 0%, 3% and 6% at 80d is 141 mu e, 96 mu e and 16 mu e, respectively. The HCSA expansion agent can effectively reduce the restrained shrinkage of UHPC and the influence on the structure.
引用
收藏
页码：4481 / 4492
页数：12
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