Bubble lightweight soil,as a new type of material,has become more widely used in roadbed engineering in cold regions due to its excellent properties such as lightweight,self compacting,and thermal insulation.In order to reduce the engineering cost of foamed lightweight soil and fully uti-lize local resources,cement-based foamed lightweight soil was prepared by replacing part of ce-ment with 0％,20％,30％,40％silty clay,and 10％fly ash,respectively.Freeze thaw durability tests were conducted on cement-based foamed lightweight soil at wet densities of 500 kg/m3,600 kg/m3,700 kg/m3,and 800 kg/m3.The effects of different amounts of silty clay and wet density on the freeze-thaw durability of cement-based foamed lightweight soil were evaluated.The results show that:①From the analysis of mass loss rate,the mass loss rate of specimens with 20％and 30％dosage is relatively small,and the freeze-thaw durability is good.②According to the analysis of relative dynamic modulus loss,the freeze-thaw durability of the specimens with a 40％content of silty clay and a wet density of 500 kg/m3 is poor and should not be used.Because silty clay con-sumes the water required for cement hydration,and the more foam,the thinner the inside of the test piece.③ A relative dynamic elastic modulus prediction model formula was established based on the number of freeze-thaw cycles and the content of silty clay as factors.The model has good validation results and a simple formula structure,making it easy to apply to practical engineering.
关键词
水泥基气泡轻质土/粉质黏土/冻融循环/相对动弹性模量
Key words
Cement based foamed lightweight soil/Silty clay/Freeze-thaw cycle/Relative dynamic mod-ulus of elasticity
维普
万方数据