Influence of Pyrolytic Waste Tire Residue on the Residual Performance of HSC Exposed to Elevated Temperatures

Abstract

The high-strength concrete (HSC) performs poorly compared to normal strength (NSC) under elevated temperature. Therefore, the performance of HSC under fir conditions is of greater concern in the concrete industry. The different mechanisms and kinetics involved in this process that controlled the behavior of HSC are its mechanical properties, material properties, thermomechanical properties, and it depends on which type of structural element is exposed to fire. The poor performance of HSC limited its application in infrastructure under fire conditions unless modifications are done at either the material level or structural level. Some researchers add polypropylene (PP) fiber at a material level to make Concrete porous and improve its performance again fire. However, the waste tire residue char (WTR) we obtain by pyrolysis process can enhance the performance of HSC under fire condition because it makes the concrete porous and reduces its density. We design the experimental work to obtain the waste tire residue char high strength concrete (WTR-HSC) and check its performance at high temperatures from 23 to 800 range of temperature. The WTR content varies from 0.5% to 1.5%, and its mechanical properties are compared with control high strength concrete (C-HSC) for residual test condition. The mechanical properties like compressive strength, split tensile strength, elastic modulus, stress-strain curves, mass loss, spalling nature, and cracks pattern at a temperature rate of 10/min were investigated. Results show that the addition of WTR in Concrete improve the performance of HSC at elevated temperature.