Fiber-Reinforced Lightweight Calcium Aluminate Cement-Based Concrete: Effect of Exposure to Elevated Temperatures

Calcium aluminate cements (CACs) are a group of rapid-hardening hydraulic binders with higher aluminum composition and lower ecological footprint compared to their ordinary Portland cement (CEM) counterparts. CACs commonly known have thermo-durability properties but previously been observed experience major strength loss over time when exposed thermal humidity conditions due the chemical conversion natural hydrated products. To address this, in this study, silica fume is added induce different hydration phase path suggested by previous studies utilized conjunction fiber-reinforced lightweight pumice produce concrete. closely evaluate performance produced samples CAC CEM, two types (CEM CAC) proportions crushed stone aggregate at temperatures between 200 1000 °C were tested. In context, sieve analysis, bulk density, flowability, compressive flexural strength, ultrasonic pulse velocity weight mixes determined. The results study point better mechanical aggregates (compared stone) high temperatures. As result, it found that perform than CEM elevated temperatures, showing suitability producing thermal-resistant CAC-based concretes.