Influence of micro-cracking on the permeability of engineered cementitious composites
Influence of micro-cracking on the permeability of engineered cementitious composites
复制标题
微裂纹对工程水泥基复合材料渗透性的影响
DOI：
10.1016/j.cemconcomp.2016.05.016
复制
发表时间：
2016-09-01
影响因子：
10.5
通讯作者：
Li, Victor C.
中科院分区：
文献类型：
--
作者：
Liu, Hezhi;Zhang, Qian;Li, Victor C.
工程水泥基复合材料（ECC）在加载超过弹性阶段时，在拉伸下形成多个微裂纹。与普通混凝土不同，这种紧密裂缝有助于即使在开裂阶段也保持低透水性。因此，ECC在水工建筑物中显示出巨大的应用潜力，如大坝和堤坝，水渗透控制对其性能至关重要。本文利用自行设计的位移控制加载装置，对ECC在恒定拉伸载荷作用下的渗透率进行了实验研究，为ECC在实际加载条件下的渗透率提供了实验数据。此外，一个分析模型，能够预测ECC复合材料的渗透性能的拉伸应变和裂纹图案的基础上提出了两种不同的ECC混合物和实验验证。本研究结果可为水工建筑物ECC的设计与应用提供参考。(C)2016爱思唯尔有限公司版权所有。
Engineered Cementitious Composites (ECC) forms multiple micro-cracks under tension when loaded to beyond the elastic stage. Unlike normal concrete, such tight cracks help to maintain low water permeability even in the cracked stage. Therefore ECC shows great potential for application in hydraulic structures, such as dams and levees for which water seepage control is critical for their performance. In this paper, the permeability of ECC under constant tensile load was experimentally studied using a specially designed displacement-control loading device, providing permeability data for ECC under realistic loading conditions. In addition, an analytical model capable of predicting permeability property of ECC composite based on tensile strain and crack patterns has been proposed and experimentally verified on two different ECC mixtures. The findings of this research are expected to support future design and application of ECC for hydraulic structures. (C) 2016 Elsevier Ltd. All rights reserved.