Influence of High Temperature on Geopolymer Powders Concrete

A recent advancement in building construction is geopolymer concrete (GP), which uses pozzolanic materials like fly ash in place of cement and is activated by an alkaline solution. This study evaluates the impact of various parameters on the compressive strength of geopolymer concrete (GP) by analyzing experimental results from nine GP mixtures. In this study, the effects of two different fibers—steel and polypropylene—were used to calculate the impact of additional fibers on geopolymer concrete following exposure to temperatures of 200 , 400 , and 600° C. Examining the impacts of two ratios of silica fume (10 and 20%) The durability parameters according to elevated temperature are visual inspection, weight reduction, and residual compressive strength. for nine fly ash-based geopolymer mixtures, steel fibers (SF) and polypropylene fibers (PP) were used in both mono and hybrid form. Steel and polypropylene fibers were added to the geopolymer concrete mix in varying fractions (0.15%, 1%, and 2%). In hybrid mixes, steel fibers replaced polypropylene fibers at a 2% inclusion rate, Additionally, one extra-plain series devoid of fiber was cast. According to experimental test results, using different kinds of fibers improved the geopolymer composites' performance at higher temperatures. At all elevated temperatures, the residual compressive strength of Steel Fiber Reinforced Geopolymer Concrete (SFRG) was much higher than that of polypropylene fiber reinforced geopolymer concrete (PFRG) at 400°C The size of the cube decreases,. the chemical bonds inside it break down, and voids and deformations appear on the cube's surfaces when samples are exposed to temperatures above 300 degrees Celsius. Additionally, the resistance of geopolymer concrete decreases by 15–20% in compressive strength.