Mechanical properties of high strength concrete reinforced with metallic and non-metallic fibres
Mechanical properties of high strength concrete reinforced with metallic and non-metallic fibres
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DOI：
10.1016/j.cemconcomp.2007.03.006
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发表时间：
2007-09-01
影响因子：
10.5
通讯作者：
Santhanam, Manu
中科院分区：
文献类型：
--
作者：
Sivakumar, A.;Santhanam, Manu
本文着重于对体积分数为0.5%的混杂纤维（钩状钢和非金属纤维的组合）增强的高强度混凝土进行的实验研究。研究了不同混杂纤维组合钢-聚丙烯、钢-聚酯和钢-玻璃制备的混凝土的力学性能，即抗压强度、劈拉强度、抗弯强度和弯曲韧性。根据日本混凝土研究所（JCI）的建议，使用四点弯曲试验对梁试样的弯曲性能进行了研究。纤维添加被认为是提高前峰以及峰后区域的负荷-挠度曲线，分别引起弯曲强度和韧性的增加。钢纤维的加入通常有助于能量吸收机制（桥接作用），而非金属纤维导致延迟微裂纹的形成。与其他混杂纤维混凝土相比，钢-聚丙烯混杂纤维混凝土的弯曲韧性与钢纤维混凝土相当。除了非金属纤维桥接较小微裂纹的能力之外，混合纤维系统中增加的纤维可用性（由于非金属纤维的密度较低）被建议为机械性能增强的原因。(C)2007爱思唯尔有限公司保留所有权利。
This paper focuses on the experimental investigation carried out on high strength concrete reinforced with hybrid fibres (combination of hooked steel and a non-metallic fibre) up to a volume fraction of 0.5%. The mechanical properties, namely, compressive strength, split tensile strength, flexural strength and flexural toughness were studied for concrete prepared using different hybrid fibre combinations steel-polypropylene, steel-polyester and steel-glass. The flexural properties were studied using four point bending tests on beam specimens as per Japanese Concrete Institute (JCI) recommendations. Fibre addition was seen to enhance the pre-peak as well as post-peak region of the load-deflection curve, causing an increase in flexural strength and toughness, respectively. Addition of steel fibres generally contributed towards the energy absorbing mechanism (bridging action) whereas, the non-metallic fibres resulted in delaying the formation of micro-cracks. Compared to other hybrid fibre reinforced concretes, the flexural toughness of steel-polypropylene hybrid fibre concretes was comparable to steel fibre concrete. Increased fibre availability in the hybrid fibre systems (due to the lower densities of non-metallic fibres), in addition to the ability of non-metallic fibres to bridge smaller micro cracks, are suggested as the reasons for the enhancement in mechanical properties. (C) 2007 Elsevier Ltd. All rights reserved.