Effect of CMK Composite Powder on Physical and Mechanical Properties of Saline Soil
Taking the saline soil in the southern area of Yuncheng,Shanxi Province as the re-search object,the study used coal metakaolin(CMK),mineral powder(MP)and cement(OPC)as the multifunctional composite modified micropowder to explore the effect of different dosages of CMK composite micropowder mixing on the physical and mechanical properties and the func-tioning mechanism of modified saline soil.Unconfined compressive strength test,infiltration test,consolidated structural matter content test and microscopic scanning electron microscope(SEM)test were performed on modified saline soil under different maintenance ages.The results show that the low dosage(mass fraction)of CMK-MP-OPC composite cementitious material can significantly improve the unconfined compressive strength of saline soil,which increases with the maintenance age.Furthermore,the best effect is achieved when 2%CMK,6%MP,2%OPC are added.The content of cemented structures can be used as a comprehensive index to reflect the performance of saline soil,and it can establish a good linear correlation with the unconfined com-pressive strength and permeability coefficient,and the SEM test results show improved micro-structure,reduced defect rate and higher density of saline soil after the improvement.
coal metakaolinsaline soilcompressive strengthcontent of consolidated struc-turemicrostructure
NETL
NSTL
万方数据
维普
