Rice husk ash as supplementary cementing material to inhibit the alkali-silica reaction in mortars

abstract: Alkali-silica reaction (ASR) is one of the most harmful distress mechanisms that affects durability concrete worldwide. Yet, it has been found ASR-induced expansion and may be prevented by appropriate use supplementary cementing materials (SCMs). Recent studies suggest rice husk ash (RHA), a by-product production, present promising performances as pozzolanic material to enhance blended mixtures. There are many controversial regarding RHA how its properties directly affect performance concretes mortars. The study aims evaluate influence on ASR through accelerated mortar bar test (AMBT), X-Rays Diffraction (XRD), Thermogravimetric Analysis (TG), Mercury Intrusion Porosimetry (MIP) Scanning Electron Microscopy (SEM). To validate obtained data, results were compared with mortars made well-known SCM (silica fume) which distinguished behaviour against ASR. indicate that, besides silica fume have showed better results, suggests mitigate ASR, yet, further analysis prims should carried out fully concrete. finesses particle size important in performance.