Alkali–Silica Reactivity Potential of Reactive and Non-Reactive Aggregates under Various Exposure Conditions for Sustainable Construction

The alkali–silica reaction (ASR) is a primary cause for premature concrete degradation. An accelerated mortar bar test often used to access the detrimental phenomena in caused by ASR of aggregates. However, this requires certain environmental conditioning as per ASTM C1260. objective study explore effects cement alkali content, exposure solution concentration, temperature, and duration on expansion. Factorial experimental design analysis was conducted delineate individual factors well their interaction. Five different aggregates with various mineralogical properties were used, representing reactive non-reactive Various dosages alkalis (0.40, 0.80, 1.20 Na2Oe), sodium hydroxide (NaOH) concentrations (0.5, 1.0, 1.5 N), temperature (40 °C, 80 100 °C) studied variables. Mortar expansion measured at 3, 7, 14, 21, 28, 56, 90 days. bars incorporating Jhelum incurred 0.32% 28 days, proving be Similarly, specimens Taxila showed 0.10% indicating nature. It observed that Sargodha 0.27% days 0.50 N NaOH concentration compared 0.31% identical exposed solution. Moreover, increased all tested specimens. Experimental results contents had relatively lesser effect 1.0 NaOH; while, case 0.5 NaOH, significant effect. noted an increase temperature. 28-day 0.290% when 40 but 0.339%. revealed major contribution towards This highlights conditions expansion, which leads decisive role selecting aggregate sources applications leading sustainable construction.