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Effect of basalt fibers on mechanical properties of calcium carbonate whisker-steel fiber reinforced concrete

机译：玄武岩纤维对碳酸钙晶须钢纤维混凝土力学性能的影响

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摘要

Nowadays, hybrid fiber reinforced concrete is being considered for structural applications due to its enhanced mechanical properties compared to concrete without fibers/plain concrete. In this work, the mechanical properties of new kind of hybrid fiber reinforced concrete, i.e. CaCO3 whisker-steel fiber basalt fiber reinforced concrete (CSBFRC) with various basalt fibers percentages are studied. All the fiber-reinforced concretes are compared with that of plain concrete (PC). The CaCO3 whisker, steel and basalt fiber lengths are 20-30 mu m, 35 mm and 12 mm, respectively. Steel fibers and CaCO3 whiskers contents are 0.32% and 0.9%, by volume, respectively. Various basalt fiber contents of 0.34%, 0.68%, 1.02% and 1.36%, by volume, are added. For each batch, cylinders and beam-lets are cast and tested under respective compressive, splitting tensile and flexural load as per ASTM standards. Stress-strain curves and load deflection curves are obtained. Strengths, energy absorptions and toughness indices are determined against for each type of loading. The scanning electron microscopy (SEM) analysis is performed to reveal the behavior (interfacial bonding) of CaCO3 whiskers, basalt fibers and steel fibers. It is concluded that, with increasing content of basalt fibers up to 0.68%, there is an increase in the mechanical properties of hybrid fiber reinforced concrete and CSBFRC4 is found to be an optimum. However, beyond 0.68%, the mechanical properties of CSBFRC decrease with an increase in the basalt fiber content. The resistance against cracking provided by hybrid fibers is observed by SEM images. (C) 2018 Elsevier Ltd. All rights reserved.
机译：如今，由于与没有纤维/普通混凝土的混凝土相比，其增强的机械性能，混合纤维增强混凝土正在被考虑用于结构应用。在这项工作中，研究了新型混合纤维增强混凝土的力学性能，即具有不同玄武岩纤维百分比的CaCO3晶须-钢纤维玄武岩纤维增强混凝土（CSBFRC）。将所有纤维增强混凝土与普通混凝土（PC）进行了比较。 CaCO3晶须，钢和玄武岩纤维的长度分别为20-30微米，35毫米和12毫米。钢纤维和CaCO3晶须含量分别为0.32％和0.9％（体积）。加入按体积计0.34％，0.68％，1.02％和1.36％的各种玄武岩纤维含量。对于每批，按ASTM标准铸造和测试圆柱体和小梁在各自的压缩，分裂拉伸和弯曲载荷下。得到了应力-应变曲线和载荷挠度曲线。针对每种载荷类型确定强度，能量吸收和韧性指数。进行扫描电子显微镜（SEM）分析以揭示CaCO3晶须，玄武岩纤维和钢纤维的行为（界面结合）。结论是，随着玄武岩纤维含量的增加高达0.68％，混合纤维增强混凝土的机械性能有所提高，CSBFRC4被认为是最佳的。但是，超过0.68％时，CSBFRC的机械性能会随着玄武岩纤维含量的增加而降低。通过SEM图像观察到由混合纤维提供的抗开裂性。 （C）2018 Elsevier Ltd.保留所有权利。

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