Combined effect of silica fume and steel fiber on the mechanical properties of high strength concretes
Combined effect of silica fume and steel fiber on the mechanical properties of high strength concretes
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DOI：
10.1016/j.conbuildmat.2007.04.017
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发表时间：
2008-08-01
影响因子：
7.4
通讯作者：
Sahin, Yusa
中科院分区：
文献类型：
--
作者：
Koksal, Fuat;Altun, Fatih;Sahin, Yusa
本试验研究了硅灰和钢纤维对混凝土试件力学性能的影响。本工作的主要目的是获得一个更延性高强混凝土生产的同时使用硅灰和钢纤维。实验中使用了长径比（纤维长度/纤维直径）为65和80的两种类型的钢纤维，钢纤维的体积分数为0.5%和1%。硅灰在混凝土中的添加量为水泥含量的0%、5%、10%和15%（重量）。水/水泥比为0.38，参考坍落度为120 +/- 20 mm。在新拌混凝土上进行坍落度试验，以测定和易性、空气含量和单位重量。对硬化混凝土试件进行了抗压强度、劈拉强度和抗折强度试验。根据ASTM C1018标准进行的弯曲试验，也得到了载荷-挠度曲线和韧性的标本。采用闭环挠度控制试验机对梁试件进行了抗弯试验，硅灰的使用提高了混凝土的力学强度和弹性模量。另一方面，在混凝土中掺加钢纤维可以显著提高高强混凝土的韧性。随着钢纤维体积分数的增加，韧性增加，并且高的纵横比值给出更高的韧性。高强钢纤维混凝土的韧性取决于硅灰掺量、纤维体积分数和纤维长径比。(C)2007爱思唯尔有限公司保留所有权利。
In this experimental study, the changes on some mechanical properties of concrete specimens produced by using silica fume and steel fiber were investigated. The main objective of this work is to obtain a more ductile high strength concrete produced by using both silica fume and steel fiber. Two types of steel fibers with aspect ratios (fiber length/fiber diameter) of 65 and 80 were used in the experiments and volume fractions of steel fiber were 0.5% and 1%. Additions of silica fume into the concrete were 0%, 5%, 10% and 15% by weight of cement content. Water/cement ratio was 0.38 and the reference slump was 120 +/- 20 mm. Slump test for workability, air content and unit weight tests were performed on fresh concretes. Compressive strength, splitting tensile strength and flexural strength tests were made on hardened concrete specimens. Load-deflection curves and toughness of the specimens were also obtained by flexural test performed according to ASTM C1018 standards. Flexural tests on beam specimens was achieved using a closed loop deflection-controlled testing machine.The use of silica fume increased both the mechanical strength and the modulus of elasticity of concrete. On the other hand, the addition of steel fiber into concrete improves toughness of high strength concrete significantly. As the steel fiber volume fraction increases, the toughness increases, and high values of aspect ratios give higher toughness. The toughness of high strength steel fiber concrete depends on silica fume content, the fiber volume fraction and the fiber aspect ratio. (C) 2007 Elsevier Ltd. All rights reserved.