As an agricultural waste, rice husk ash has high volcanic ash and can be replaced by cement. Many studies have shown that high-activity rice hull ash, like fly ash and silica fume, can improve the performance of cement and concrete. Very good application prospects.

In this study, high activity rice husk ash was synthesized by controlling the calcination late in the commercial calciner, and the ASTM rapid freeze-thaw experiment and JIS A1127 were used to determine the mass loss, relative dynamic elastic modulus and strength change. The freeze-thaw resistance of this high-activity rice hull ash concrete was 0.45, 0.55 and 0.65. The effects of air bubbles and air on the freeze-thaw resistance of high-activity rice ash concrete were analyzed.

Studies have shown that no matter which water-to-binder ratio, 10% and 20% high-activity rice husk ash concrete have good freeze-thaw resistance. However, the freeze-thaw resistance of 30% rice hull ash concrete decreased.

Air content and average bubble spacing coefficient of concrete greatly affect the freeze-thaw resistance of rice husk ash concrete. After hardening, rice husk ash concrete with gas content of 4.5% and average bubble spacing coefficient of 300um has good freeze-thaw resistance.

From the perspective of frost resistance of concrete, the upper limit of the content of highly active rice husk ash in concrete is 20%.

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