Mechanical properties of hybrid fiber reinforced lightweight aggregate concrete made with natural pumice
Mechanical properties of hybrid fiber reinforced lightweight aggregate concrete made with natural pumice
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DOI：
10.1016/j.conbuildmat.2010.11.058
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发表时间：
2011-05-01
影响因子：
7.4
通讯作者：
Soroushian, Parviz
中科院分区：
文献类型：
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作者：
Libre, Nicolas Ali;Shekarchi, Mohammad;Soroushian, Parviz
本研究旨在探讨掺加钢纤维与聚丙烯纤维之浮石轻集料混凝土之延性。研究了掺加钢纤维和聚丙烯纤维后浮石轻集料混凝土力学性能、体积密度和工作性的变化。研究了新拌混凝土的体积密度、工作性以及硬化混凝土的抗压强度、弯拉强度、劈拉强度和韧性。九个混凝土混合物与不同体积分数的钢和聚丙烯纤维进行了测试。观察到由于钢纤维的加入，压缩和弯曲延性和能量吸收能力的大幅度增加。聚丙烯纤维，另一方面，硬化混凝土的机械性能，特别是在与钢和聚丙烯纤维制成的混合物中引起微小的变化。这些观察提供了洞察不同的纤维增强系统的浮石轻骨料混凝土，这被认为是脆性的力学性能的好处。这些结果为不同应用场合的混凝土材料的设计提供了指导，包括高层抗震建筑的建造。(C)2010爱思唯尔有限公司版权所有。
The purpose of this study is to improve the ductility of pumice lightweight aggregate concrete by incorporating hybrid steel and polypropylene fibers. The changes in mechanical properties and also bulk density and workability of pumice lightweight aggregate concrete due to the addition of hybrid steel and polypropylene fibers have been studied. The properties were investigated include bulk density and workability of fresh concrete as well as compressive strength, flexural tensile strength, splitting tensile strength and toughness of hardened concrete. Nine concrete mixtures with different volume fractions of steel and polypropylene fibers were tested. A large increase in compressive and flexural ductility and energy absorption capacity due to the addition of steel fibers was observed. Polypropylene fibers, on the other hand, caused a minor change in mechanical properties of hardened concrete especially in the mixtures made with both steel and polypropylene fibers. These observations provide insight into the benefits of different fiber reinforcement systems to the mechanical performance of pumice lightweight aggregate concrete which is considered to be brittle. These results provide guidance for design of concrete materials with reduced density and enhanced ductility for different applications, including construction of high-rise, earthquake-resistant buildings. (C) 2010 Elsevier Ltd. All rights reserved.