Effect of different PVA and steel fiber length and content on mechanical properties of CaCO3 whisker reinforced cementitious composites
Effect of different PVA and steel fiber length and content on mechanical properties of CaCO3 whisker reinforced cementitious composites
复制标题
不同PVA和钢纤维长度及含量对CaCO3晶须增强水泥基复合材料力学性能的影响
DOI：
10.3989/mc.2019.12918
复制
发表时间：
2019-10-01
影响因子：
2.1
通讯作者：
Khan, M.
中科院分区：
文献类型：
--
作者：
Cao, M.;Xie, C.;Khan, M.
本文将碳酸钙（CaCO3）晶须作为纤维增强材料与钢和PVA纤维混合形成多尺度混合纤维增强水泥基复合材料（MHFRCC）。采用 ASTM 标准和裂纹后强度技术来评估 MHFRCC 的机械性能。 1.25% 长钢纤维、0.55% 短 PVA 纤维和 2.0% CaCO3 晶须样本在 L/600 挠度前表现出最佳的弯曲性能。然而，1.5%长钢纤维、0.4%长PVA纤维和1.0%CaCO3晶须试样在L/600挠度后表现出更好的抗裂性。结果表明，弯曲参数随着综合增强指数的增加而增加。结果表明，CaCO3晶须和PVA短纤维在微观尺度上具有抗裂作用，主要对抑制微裂纹起主导作用。然而，长钢纤维和长PVA纤维在大挠度下表现出更好的宏观裂纹桥接效果。
In this paper, calcium carbonate (CaCO3) whisker as a fiber reinforcement is mixed with steel and PVA fiber to form a multiscale hybrid fiber reinforced cementitious composites (MHFRCC). ASTM standard and post-crack strength techniques are performed to evaluate the mechanical properties of MHFRCC. The 1.25 % long steel fiber, 0.55 % short PVA fiber and 2.0 % CaCO3 whisker specimens showed the best flexural behavior before L/600 deflection. However, 1.5 % long steel fiber, 0.4 % long PVA fiber and 1.0 % CaCO3 whisker specimens presented better crack resistance after L/600 deflection. It is revealed that flexural parameters increase as comprehensive reinforcing index increase. The result showed that the CaCO3 whisker and short PVA fiber provided crack resistance effect at micro-scale and mainly play a dominate role in inhibiting micro-cracking. However, long steel fiber and long PVA fiber showed a better bridging effect of macro cracks at a large deflection.