Research on influence of aggregate characteristics on fluidity of soil-based controlled low-strength materials
Soil-based controlled low strength materials(CLSM)is a development direction for low-carbon green backfill materials.In this study,glass beads with equal particle sizes of 0.5mm,1mm,2mm,5mm and 10mm are used as ideal aggregates,and the feasibility of preparing soil-based CLSM with silt and water as binder agents is discussed.The effects of particle size and content of glass aggregate and water-solid ratio on the fluidity of soil-based CLSM materials are studied.The results show that all aggregates with ideal particle size within the experimental range can be configured with CLSM that meets the fluidity requirements of construction.The soil-based CLSM of all aggregate sizes exhibits an increase in fluidity with the increase of water-solid ratio.The water-solid ratio corresponding to good fluidity is only related to aggregate content,but not to the particle size.The fluidity of low content aggregate is controlled by the fluidity of soil matrix,and the water-soil ratio corresponding to good fluidity is the same as that of pure soil.Bleeding occurs in the test of high-content aggregate,and the water-soil ratio is consistent with that of pure soil when it shows bleeding.Based on the aggregate stacking structure,the results are further analyzed,and it is found that the dominant aggregate content is between 40%and 50%.
soil-based controlled low-strength materialsideal aggregatefluiditywater-solid ratio
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