Unconfined compressive strength and micro-structural properties of cemented sand and gravel materials

摘要

The purpose of this study is to provide basic information fortheutilization oftheenvironmentally-friendly and economically outstanding CSG (cementedsand andgravel)construction method, which includesthephysical and mechanical properties ofCSGmaterials, such astheunconfined compressive strength,themicroscopic structure andthefreezing and thawing resistancegiventhe volume and curing time of the CGS andthesize ofthespecimen. In this study, specimens with four different cement contents of 4, 6, 8and 10% of the total weight and three different sizesofφ50×100 mm,φ100×200 mm andφ150×300 mmwere prepared to examine the characteristics of the sizes ofthespecimensand the features includingthecompressive strength, microscopic structure, freezing-thawingresistanceand degree of wet-dryresistance. The results show that the larger the size ofthespecimen and the greater the content of cement in the specimen, the higher the compressive strength, freezing-thawing resistance,and wet-dry resistance. Moreover,thereactive products for each size of specimenwereexamined,and itwas observedthat some typical needle structured ettringitewas generated due totheblending of cement through microscopic structuralanalysis,such as SEM and EDS analyses.