PERFORMANCE EVALUATION OF STRUCTURAL LIGHTWEIGHT CONCRETE INCORPORATING ALUMINUM POWDER ANDPUMICE IN FIRE CONDITION

Ashraf M. A. Heniegal, ALsaeed Abdel SalamMaaty, Amr Basuoni Ibrahim Al-Samahy

Abstract: The basic aim of this research is to study the production and the performance of structural lightweight concrete using pumice stone (PS)as a different replacement of coarse aggregate (25%, 50%, 75% and 100% by volume) and aluminum powder (AP)as an additive by 0.5% of cement weight in the fire condition (with periods up to 2 h, at different temperatures varied of 200-800 °C). The performance was determined by investigating compressive strength, flexural strength, thermogravimetric analysis (TGA) and bond strength. As a result, the increase in replacement ratio of PS with afixed content of AP has a positive influence on compressive, flexural strength and bond strength during the exposure to the fire. For examples, the residual bond strength go up in the range 21-53% by increasing PS content from 25% to 100% as a replacement of coarse aggregate by volume. The thermogravimetric analysis curve shows that the early weight loss was at temperatures of 30-120 °C, with arate of weight loss in the range 0.6-1.2%, for all mixtures, while the total weight loss at 800 °C was in the range 14.5-19.6%. Moreover, the compositions of concrete containing PS with AP are the highest resistance to thermal decomposition and the least in weight loss, according to results of TGA.

Keywords: structural lightweight concrete, fire, aluminum powder, thermogravimetric analysis, pumice.

DOI: https://doi.org/10.15623/ijret.2017.0610017