Influence of particle size of volcanic ash silicate cement on its hydration reaction
Different fineness of volcanic ash silicate cement were obtained by different fineness of sieves and adjustment of grinding time.The effect of fineness of volcanic ash silicate cement on the macroscopic properties of volcanic ash silicate cement was investigated from a microscopic point of view by combining X-ray diffraction(XRD)and scanning electron microscopy(SEM)techniques.The results showed that as the fineness of volcanic ash silicate cement increases from 224.45 m2·kg-1 to 576.88 m2·kg-1,the compressive and flexural strengths increase,the setting time of the cement of volcanic ash silicate decreases and the water consumption of the standard consistency increases.The hydration products were observed to be calcium alumite crystals and C-H-S gels by XRD and SEM,and the peak values of calcium alumite crystals and Ca(OH)2 were found to increase with increasing fineness by XRD.
pozzolanic cementfinenessXRDSEMsetting timerequirement of normal consistency
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