Effect of Elevated Temperature on the Strength Behavior of Fly-Ash Modified Cement Mortar

Effect of Elevated Temperature on the Strength Behavior of Fly-Ash Modified Cement Mortar

Journal of Brilliant Engineering (BEN)
Volume 5 - Issue 2 - April 2024

Shamema Jahan Nirmal Chandra Roy Md. Hafizur Rahman NHM Kamrujjaman Serker

Abstract

The compressive strength (CS) is a great importance parameter for devising concrete constructions. The concrete frameworks may be exposed to unintentional fire hazards and explosions throughout their worship life. The components of the building include columns, beams and slabs will be exposed to extreme heat in the accidental case of fire hazard. To ensure the execution of concrete construction, it is crucial to comprehend the modifications to the characteristics of concrete under extreme temperature exposure. This study aims to investigate the effects of variation of temperatures, water/cement (w/c) ratios and variation of fly ash on the compressive strength of cement mortar. Fly ash percentages of 0%, 20%, 25%, 30%, 35%, and 40% were taken into consideration. The ratios of cement to water were evaluated as follows: 0.35, 0.40, 0.45, 0.50, and 0.55. The following temperature ranges were taken into consideration: 25 °C, 100 °C, 200 °C, 350 °C, 450 °C, and 600 °C. The test's findings show that, up to 200 °C, the compressive strength of cement mortar with various w/c ratios improves. The strength behavior of concrete increases up to w/c ratio 0.45 and then decreases gradually with the increases in water cement ratios. The strength properties of concrete increase in temperature at up to 200 °C, then decrease gradually with the increases in temperature. Conversely, though above 200˚C, compressive strength decreases gradually with the elevation of temperature.

Keywords

W/C ratio, Fly ash, CS, Elevated temperature Cement mortar,
https://doi.org/10.36937/ben.2024.4918