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Effect Of Elevated Temperature On Mechanical Properties Of Fiber Self Compacting Concrete

Authors: Dr. Ahmed M. Tahwia *, Dr. Ahmed H. Abdelreheem, Saeed A. Mohaisen;

Effect Of Elevated Temperature On Mechanical Properties Of Fiber Self Compacting Concrete

Abstract

This study presents the effect of elevated temperature on mass loss ratio, ultrasonic pulse velocity, compressive strength, tensile strength, and flexural strength of self-compacting concrete (SCC) and fiber reinforced self-compacting (FRSCC). Slump flow, T50 flowing time, L-box and GTM screen stabilities were investigated. The experimental program consist of six mixtures. The control mixture SCC were made without fibers. The other five mixtures made with added three different types of fibers (Polypropylene, steel, and glass). 0.1% Polypropylene fibers, 1% glass fibers and 1% steel fibers by concrete volume were used for PFSCC, GFSCC and SFSCC mixtures respectively. For HFSCC1, 0.05% polypropylene fibers and 0.5% steel fibers by concrete volume were added. For HFSCC2 mix added 0.5% glass fibers and 0.5% steel fibers by concrete volume.The properties of SCC and FRSCC mixtures at 20 °C, 200°C, 400°C, 600°C, and 800 °C were measured after 28 days. The specimens were heated by using electric furnace at a rate of 5 °C /min. The results show that the compressive strength, tensile strength and flexural strength increased with the increasing temperature up to 200 °C and decreased at a temperature higher than 200°C. The PP fibers reduced and eliminated the risk of the spalling in the SCC. With increasing temperature the concrete mixes including steel fibers and hybrid fibers appear the best mechanical properties and spalling resistance. The weight losses for the SCC mixtures with PP and steel fiber were lower than those without PP and steel fibers. In general, fibers decreased fresh concrete properties.

Keywords

Self-compacting concrete; elevated temperature; Glass fibers; Steel fibers; hybrid fibers.

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This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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