工业废渣改良水泥土力学及抗冻性能研究  

Research on Mechanical and Frost Resistance of Cement Soil Improved by Industrial Waste Residue

作　　者：王莉萍 WANG Liping(China Railway 18th Bureau Group Fifth Engineering Co.,Ltd.,Tianjin 300451,China)

机构地区：[1]中铁十八局集团第五工程有限公司,天津300451

出　　处：《路基工程》2025年第1期90-95,共6页Subgrade Engineering

摘　　要：通过正交试验设计粉煤灰-脱硫石膏复合改良水泥土配合比,并研究其力学性能和抗冻性能。结果表明:水泥掺量对水泥土力学强度影响最大,粉煤灰掺量次之,建议最佳配合比为水泥掺量16%、脱硫石膏掺量6%、粉煤灰掺量12%;复合土力学强度随养生龄期增加逐渐增长,28天抗压强度约为极限抗压强度的74.4%;复合土力学强度随含水率增加呈线性降低,含水率增加1.0%,抗压强度和劈裂强度分别平均降低8.5%、8.4%;复合土抗冻性能优于普通水泥土,随冻融次数增加,复合土抗压强度先增大后减小,冻融3次的抗压强度较冻融前平均提高6.4%,冻融20次的残留强度比平均为82.0%。The mix ratio of fly ash-desulfurized gypsum compound improved cement soil was designed by orthogonal test,and its mechanical properties and frost resistance were studied.Studies have shown that the amount of cement has the greatest impact on the mechanical strength of cement soil,followed by the amount of fly ash.It is recommended that the best mix ratio is 16%of cement,6%of desulfurized gypsum,and 12%of fly ash.The mechanical strength of compound soil increases gradually with the increase of curing age.The 28 d compressive strength is about 74.4%of the ultimate compressive strength;the mechanical strength of compound soil decreases linearly with the increase of water content,the water content increases by 1.0%,and the compressive strength and splitting strength are reduced by 8.5%and 8.4%respectively;the frost resistance of compound soil is better than that of ordinary cement soil.With the increase of freezing and thawing times,the compressive strength line of compound soil increases and then decreases.Compared with the compressive strength before freezing and thawing,the compressive strength of 3 freeze-thaw cycles is increased by an average of 6.4%,and the residual strength ratio of the 20 freeze-thaw cycles is 82.0%on average.

关 键 词：工业废渣 水泥土 力学性能 冻融循环 抗冻性能 

分 类 号：U414[交通运输工程—道路与铁道工程]