Comparison of two processes for treating rice husk ash for use in high performance concrete

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High-strength rice husk ash concrete incorporating quarry dust as a partial substitute for sand (2011, unknown): “The beneficial effects of RHA on concrete with respect to its mechanical properties and durability have been widely discussed [1-16].”
Effect of grinding of low-carbon rice husk ash on the microstructure and performance properties of blended cement concrete (2015, methodology): “[16], the normalized strength value obtained for ground RHA both before and after chemical treatments were below 100, indicating that such treatments could change the total silica content of RHA significantly but cannot change much its reactivity.”
Experimental characterization of binary and ternary blended-cement concretes containing ultrafine residual rice husk and sugar cane bagasse ashes (2012, result): “These findings were also observed in other investigations with RHA [20,21].”
Activation of Metakaolin/Slag Blends Using Alkaline Solutions Based on Chemically Modified Silica Fume and Rice Husk Ash (2012, background): “These conditions have been determined in previous studies as being suitable in order to obtain a highly reactive pozzolan from this particular source of rice husks [36, 37].”