Influence of Elevated Temperature on Performance of Ultra High Strength Fibre Reinforced Self Compacting Concrete (UHSFRSCC) Produced from Local Materials

Document Type : Research articles

Authors

1 Department of Civil Engineering, (Shoubra), Benha University, Egypt

2 Department of Civil Engineering,Beni Suef University, Egypt

Abstract

EThis study investigates the effect of elevated temperatures (25 ℃, 200 ℃, and 300 ℃) in the furnace with a heating time of 1 h on residual mechanical, transport and microstructure properties of different UHSFRSCC concrete. This study presents a systematic experimental investigation to evaluate the effect of Silica fume (SF) (partially replaced by 20% cement), blended 5% Metakaolin (MK) with 15%SF (partially replaced by cement) and, Limestone (LS) Powder (partially replaced by 20% cement), and Quartz Powder (QP) (partially replaced by 34% sand) on fresh characteristics, the mechanical (compressive and splitting tensile strength), transport properties (sorptivity) and microstructure (SEM-EDS) properties of UHSFRSCC. The results reveal that, incorporating QP to UHSFRSCC has not significant effect on its rheological classes (flowability, viscosity and passing ability) while MK significantly decrease it. The mix containing 20%SF has a compressive, splitting tensile strength of 120.7 MPa and 13.6 MPa respectively after 28 days water curing. Moreover, incorporating 20%LS as cement replacement and replacing 5% MK by SF to mixture contained 34% QP as sand replacement improves compressive, splitting tensile strength and sorptivity by 9.6, 16.9 and 40.7% respectively under normal ambient temperature. Although relative residual compressive, splitting tensile strengths, transport and microstructure properties were gradually degraded by exposure to elevated temperature up to 300℃, relative residual strengths, transport and microstructure properties of UHSFRSCC were significantly increased with incorporating compound LS and/or MK powders as a cement replacement material.

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