Quasi-static and dynamic compressive behavior of ultra-high toughness cementitious composites in dry and wet conditions
Quasi-static and dynamic compressive behavior of ultra-high toughness cementitious composites in dry and wet conditions
复制标题
超高韧性水泥基复合材料在干湿条件下的准静态和动态压缩行为
DOI：
10.1016/j.conbuildmat.2019.117008
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发表时间：
2019-12
影响因子：
7.4
通讯作者：
Cheng Wang
中科院分区：
文献类型：
--
作者：
Xin Zhao;Hedong Li;Cheng Wang
研究了超高韧性水泥基复合材料（UHTCC）在干、湿状态下的准静态和动态压缩性能。水的存在降低了UHTCC的准静态抗压强度和峰值应变，而导致弹性模量和泊松比的增加。在动态荷载作用下，浸水后UHTCC混凝土的抗压强度降低，强度表现出应变率敏感性，这与普通混凝土不同。这种现象的潜在机制可能归因于聚乙烯醇（PVA）纤维在基体中的桥接作用。为了验证这一假设，在本研究中，测试了不同体积分数（0%，0.75%，1.5%，2.0%）的PVA纤维增强的试件。试验结果表明，在不掺纤维的情况下，湿态试件的动态抗压强度高于干态试件，这与前人对普通混凝土的研究结果一致。自由水对复合材料强度应变率敏感性的影响与纤维含量有关。
This paper investigated the quasi-static and dynamic compressive behavior of ultra high toughness cementitious composites (UHTCC) in dry and wet conditions. The presence of water decreased the quasi-static compressive strength and peak strain of UHTCC, whereas that led to the increase in the elasticity modulus and Poisson's ratio. Under dynamic loading, the reduction of compressive strength and the strain rate sensitivity in terms of strength in UHTCC were observed after water immersion, which was different to those in normal concrete. The underlying mechanism for such phenomenon may attribute to the bridging effect of polyvinyl alcohol (PVA) fibers in the matrix. In order to verify this assumption, the specimens reinforced with different volume fractions (0%, 0.75%, 1.5%, 2.0%) of PVA fiber were tested in this study. Test results showed that, in the case of the specimens without fiber, wet specimens exhibited higher dynamic compressive strength compared with dry specimens, which was consistent with the previous results for normal concrete. Moreover, the influence effect of free water on the strain rate sensitivity in terms of strength of composites was relative to the fiber content.
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影响因子：
4.4
作者：
Jikai Zhou;N. Ding
通讯作者：
Jikai Zhou;N. Ding
影响因子：
7.4
作者：
Shengxing Wu;Xudong Chen;Jikai Zhou
通讯作者：
Shengxing Wu;Xudong Chen;Jikai Zhou
影响因子：
3.8
作者：
I. Yaman;N. Hearn;H. Aktan
通讯作者：
I. Yaman;N. Hearn;H. Aktan
影响因子：
5.1
作者：
L. Yang;V. Shim
通讯作者：
L. Yang;V. Shim
DOI：
10.1061/(asce)0733-9445(2000)126:2(235
发表时间：
2000-02-01
期刊：
JOURNAL OF STRUCTURAL ENGINEERING-ASCE
影响因子：
--
作者：
Slowik, V;Saouma, VE
通讯作者：
Saouma, VE