Effect of Aggregate Size on Water Retention Curve and Pore Size Distribution of Lateritic Clay
To investigate the effect of aggregate size on water retention characteristics and pore size distributions(PSDs),the water retention curves measurement and mercury intrusion porosimetry(MIP)over a wide suction range,were conducted on lateritic clay specimens with different aggregate sizes by axial translation techniques(ATT)and vapor equilibrium techniques(VET).The water retention and PSD curves were obtained to explore the microscopic mechanism by which aggregate size affects water retention in soil.The results showed that aggregate size only had great effect on the water retention in the low suction range,and the air-entry value was higher for specimen with smaller aggregate size,and the smaller the aggregate size dimension,the larger the inlet value of the specimen.The PSDs were unimodal for saturated compacted specimens with different aggregate sizes.It was found that the smaller aggregate size of the specimen,the higher the peak of the concentrated PSD,and the narrower the distribution range,which means the smaller the particle size,the more uniform the pore size distribution.The comparison of predicted and measured water retention curves proved that due to the neglection on the reduction of void ratio of specimen in drying process,the PSD curve could predict be used to predict the water content with different suctions,while the predict saturation was lower than the measured result.
unsaturated lateritic claycompacted specimenaggregate sizewater retention curvepore size distribution
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