Inhibition Mechanism of Rice Husk Ash Particle Size on Alkali-Silica Reaction in Alkali-Activated Slag Concrete
GAO Peng1,2,3, NI Zhuang1, DONG Wei1,2,3, WEN Yang1,2,3, YU Hongfa4
1 Department of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China 2 Inner Mongolia Autonomous Region Building Structure Disaster Prevention and Mitigation Engineering Technology Research Center, Baotou 014010, Inner Mongolia, China 3 Inner Mongolia Key Laboratory of Safety and Durability for Civil Engineering, Baotou 014010, Inner Mongolia, China 4 Department of Civil and Airport Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
Abstract: In order to solve the durability problem of alkali-activated materials caused by alkali activator and promote the industrial application with agricultural wastes, rice husk ash (RHA) with different particle sizes was used instead of slag to prepare alkali-activated slag (AAS) mortar. MIP, XRD and SEM were used to analyze the effects of RHA particle size on the fluidity, mechanical properties and inhibition mechanism of alkali-silica reaction (ASR) of AAS. The results show that the compressive strength and fluidity of AAS can be improved by reducing the particle size of RHA particles. Smaller RHA particles significantly inhibit ASR, resulting in less alkali solution erosion due to lower porosity and improved adsorption of alkali metal ions by low calcium-silica ratio gel. On the contrary, larger RHA particles will increase the total porosity and harmful porosity ratio, promote the contact between alkali ions and active aggregate, and lead to higher expansion. Under specific K(Na)/Si ratios and low porosity, ASR product Na-shlykovite crystals can partially transform into K-shlykovite crystals, coexisting to reduce expansion space.
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2025, Vol. 39 
