Tensile performance and impact resistance of Strain Hardening Cementitious Composites (SHCC) with recycled fibers
Tensile performance and impact resistance of Strain Hardening Cementitious Composites (SHCC) with recycled fibers
复制标题
再生纤维应变硬化水泥基复合材料 (SHCC) 的拉伸性能和抗冲击性
DOI：
10.1016/j.conbuildmat.2018.03.108
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发表时间：
2018-05-20
影响因子：
7.4
通讯作者：
Leung, Christopher K. Y.
中科院分区：
文献类型：
--
作者：
Lu, Cong;Yu, Jing;Leung, Christopher K. Y.
应变硬化胶凝复合材料（SHCC）是一种具有应变硬化和多重开裂行为的纤维增强复合材料。SHCC中使用的聚乙烯醇（PVA）纤维对于普通土木工程应用来说价格昂贵，因此本研究使用一种从废塑料中回收的聚对苯二甲酸乙二醇酯（PET）纤维作为PVA纤维的替代品。对PVA或PET纤维制成的SHCC样品进行单轴拉伸试验，发现PET-SHCC的性能比PVA-SHCC差，这是由于PET纤维与基体之间的结合较弱。然而，在评估SHCC的冲击吸能能力的改进Charpy冲击试验中，PET-SHCC与PVA-SHCC相比耗散了大量的能量，说明PET纤维对胶凝复合材料具有优异的抗冲击性。为了揭示冲击能量吸收的机理，建立了模拟冲击试验的物理模型，可以很好地支持实验观察结果。基于上述研究结果，建议在实际应用中使用1 vol% PVA纤维和1 vol% PET纤维的混合材料，以低成本提供足够的拉伸性能和优异的抗冲击性。(C) 2018 Elsevier Ltd.版权所有。
Strain Hardening Cementitious Composites (SHCC) are fiber reinforced composites exhibiting strain hardening and multiple cracking behaviors. The Polyvinyl Alcohol (PVA) fibers used in SHCC are expensive for normal civil engineering applications, so one kind of Polyethylene terephthalate (PET) fibers recycled from waste plastics are used in this study as a substitute of PVA fibers. Uniaxial tensile test was carried out on SHCC samples made with PVA or PET fibers where the PET-SHCC was found to behave poorer than the PVA-SHCC due to the weaker bond between PET fibers and matrix. Nevertheless, in the modified Charpy impact test which was designed to evaluate the impact energy absorption ability of SHCC, the PET-SHCC dissipated a great amount of energy comparable to that by PVA-SHCC, indicating that PET fibers can provide excellent impact resistance to cementitious composites. To reveal the mechanism of impact energy absorption, a physical model was developed to simulate the impact test, which can well support the experimental observations. Based on above findings, a hybrid mix of 1 vol% PVA fibers and 1 vol% PET fibers is recommended for practical applications to provide adequate tensile performance and excellent impact resistance with eco-friendly ingredients at low cost. (C) 2018 Elsevier Ltd. All rights reserved.