Prediction Model for the performance of Fly-Ash Based High-Strength Concrete at Elevated Temperature

Abstract

High-Strength Concrete (HSC) is generally acknowledged for its robustness and long-lasting nature, making it essential in a wide range of applications. Concrete experiences a reduction in its compressive strength after being exposed to fire. Diverse techniques are employed to determine the remaining strength following fire exposure. Computational models that can accurately forecast the residual strength of concrete are required to minimize time, cost, and financial resources. This study evaluates the performance of Fly Ash-Based High-Strength Concrete (HSC) when exposed to high temperatures, highlighting its importance in situations that demand durable fire-resistant materials. For this purpose, the cylindrical Samples are tested for (HSC) at room temperature and then exposed to the temperature ranging from 300 ℃ to 900 ℃ with a constant duration of 4 hr. This study compares the difference between the residual strength of  heated cylinder for 2 groups, Group 1 Control Mix consists of pure cement, while Group 2  Binary Mix(Ash)  10% Fly Ash, The comparison of Group 1 and Group 2 after post fire performance  shows that at 300 ℃ compressive strength (CS) for Group 2 is 9% lower than that of Group1 while at 900℃ Group 1 have 45% more better strength than Group1 and this is due to FA. Furthermore, 2 regression Equation are formed for both groups and their predicted and experimental results are compared which have 5 to 7% difference with R square value is 0.9666, 0.9794 and 0.9103, 0.8957 respectively.