Combined influence of waste steel fibre and fly ash on rheological and mechanical performance of fibre-reinforced concrete

IF 1.6 Q3 ENGINEERING, CIVIL Australian Journal of Civil Engineering Pub Date : 2021-01-04 DOI:10.1080/14488353.2020.1857927
Abu Sayed Mohammad Akid, S. Shah, M. H. R. Sobuz, V. Tam, Sazzad Hossain Anik
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引用次数: 14

Abstract

ABSTRACT This study aims to investigate the combined influence of varying concentration of waste steel fibre and fly ash on rheological and mechanical performance of fibre-reinforced concrete (FRC). Cement was substituted partially by fly ash at concentration of 5%, 10% and 20% by weight basis and waste steel fibre was incorporated as 1.5% and 3% in volume basis of concrete. Rheological tests of concrete, including slump, density, compacting factor, K-slump, and Kelly ball penetration were evaluated for the fresh state. Mechanical performances of concrete, including compressive, splitting tensile and flexural strength were determined at 7 and 28 days. Test results exhibited that fly ash enhanced the workability of all rheological tests; however, waste steel fibre reduced the workability and increased the density of fresh concrete. Substantial enhancement in compressive, splitting tensile and flexural strength was found for fly ash and waste steel FRC mixes than the control one. The optimum results of mechanical performance were achieved for mixture with concentration of 10% fly ash and 3% waste steel fibre among all mixes. Adding waste steel fibre with fly ash in concrete provided more pronounced mechanical performance at higher fibre concentration along with the minimisation of disposal problems and environmental damages.
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废钢纤维和粉煤灰对纤维混凝土流变性能和力学性能的联合影响
摘要本研究旨在研究不同浓度的废钢纤维和粉煤灰对纤维混凝土流变和力学性能的综合影响。水泥部分由浓度为5%、10%和20%(重量)的粉煤灰代替,废钢纤维以混凝土体积的1.5%和3%掺入。评估了混凝土的流变试验,包括坍落度、密度、压实系数、K坍落度和方钻杆贯入度。在第7天和第28天测定了混凝土的力学性能,包括抗压强度、劈拉强度和弯曲强度。试验结果表明,粉煤灰提高了所有流变试验的工作性;但废钢纤维降低了新拌混凝土的工作性能,增加了新拌密度。与对照相比,粉煤灰和废钢FRC混合物的抗压、劈拉和抗弯强度显著提高。在所有混合料中,粉煤灰浓度为10%、废钢纤维浓度为3%的混合料力学性能最佳。在混凝土中加入废钢纤维和粉煤灰,在纤维浓度较高的情况下提供了更显著的机械性能,同时将处理问题和环境破坏降至最低。
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CiteScore
3.90
自引率
7.70%
发文量
31
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