Properties of calcium sulfoaluminate cement made ultra-high performance concrete: Tensile performance, acoustic emission monitoring of damage evolution and microstructure

Properties of calcium sulfoaluminate cement made ultra-high performance concrete: Tensile performance, acoustic emission monitoring of damage evolution and microstructure
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硫铝酸钙水泥制成的超高性能混凝土的性能:拉伸性能、损伤演变和微观结构的声发射监测

DOI:
10.1016/j.conbuildmat.2019.03.057
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发表时间:
2019-05
影响因子:
7.4
通讯作者:
Wu Kai
Wu Kai
中科院分区:
工程技术1区
文献类型:
--
作者:
Wang Jun Yan;Chen Zhen Zhen;Wu Kai

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研究了硫铝酸钙(CSA)水泥配制的早强超高性能混凝土(ES-UHPC)的抗拉性能、声发射(AE)损伤演化和微观结构。结果表明,ES-UHPC的极限拉应变ε Utu在1d时可达0.199%,是同龄期普通UHPC(N-UHPC)的4.23倍; AE测试结果表明,两种类型的UHPC在28 d表现出多重开裂行为。随着拉伸应变的发展,两种超高性能混凝土表现出相似的损伤演化趋势,当应变达到0.046%时,出现多条裂纹宽度小于0.01 mm的微裂纹。微观结构测试表明,在4 h后出现钙矾石,且从4 h到3 d钙矾石含量显著增加,这有助于ES-UHPC的早期力学性能。
The properties of early age strength ultra-high performance concrete (ES-UHPC) made with calcium sulfoaluminate (CSA) cement, including tensile performance, damage evolution monitored by acoustic emission (AE) and microstructure were evaluated in this work. Results show that the ultimate tensile strainεUtuof ES-UHPC can reach to 0.199% at 1 d, which is 4.23 times larger than that of normal UHPC (N-UHPC) at the same testing age. AE testing results indicate that both types of UHPCs exhibit multiple cracking behavior at 28 d. With the tensile strain developing, the two UHPCs show a similar damage evolution trend and multiple microcracks with crack-width smaller than 0.01 mm generated after 0.046% strain reached. Microstructure tests demonstrate that ettringite presented after 4 h and the content increased significantly from 4 h to 3 d, which contributed to the early mechanical properties for ES-UHPCs.
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