Abstract
Abstract The micromechanical behaviour of sand grains coated with a clay agent is examined in the study. The coating was applied using a suspension of sand grains and kaolinite powder with a wide spectrum of coating percentages and durations of vibration to achieve different classes of coating. Element composition, measurement of surface roughness and single grain crushing tests were used for the basic characterisation of the materials. From pure sand grains to lightly coated grains, there was observed a significant shift of the inter-particle friction but the differences were smaller between lighter and heavier coating. Microscopic images showed the creation of debris during shearing which might have contributed to the increase of friction from the uncoated to the coated grains.
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