工业废渣改良水泥土配合比设计及耐久性分析  

Design and Durability Analysis of Industrial Waste Improved Cement Soil Compound Ratio

作　　者：曾亚平 ZENG Yaping(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》2024年第6期100-106,共7页Subgrade Engineering

摘　　要：选用粉煤灰和脱硫石膏改良水泥土,通过室内无侧限抗压强度试验设计水泥土、粉煤灰改良水泥土和脱硫石膏改良水泥土配合比,并对其耐久性进行评价。结果表明:随龄期增加,ϕ50×h50 mm的水泥土抗压强度与ϕ50×h100 mm的水泥土强度比值逐渐趋于稳定,建议最大水泥掺量为12.0%;同一水泥掺量或粉煤灰掺量下,粉煤灰水泥土无侧限抗压强度变化曲线形状相近,水泥掺量为8.0%、12.0%时,粉煤灰掺量12.0%的水泥土抗压强度达到峰值;同一养生龄期下,脱硫石膏掺量对提高水泥土抗压强度效果较差,脱硫石膏水泥土无侧限抗压强度随水泥掺量增加呈线性增长,随脱硫石膏掺量增加呈先增大后减小,在水泥掺量≥12.0%、脱硫石膏掺量6.0%时取得最大值,建议脱硫石膏最大掺量为4.0%;粉煤灰水泥土抗冻性能最优,改良黄土无侧限抗压强度和残留质量比随冻融次数增加呈线性降低。Fly ash and desulfurization gypsum Improved cement soil were selected,and the durability of cement soil,fly ash Improved cement soil and desulfurization gypsum Improved cement soil was evaluated by designing the proportion of cement soil,fly ash Improved cement soil and desulfurization gypsum Improved cement soil through indoor unconfined compressive strength test.The results show that the compressive strength ofϕ50×h50 mm and the ratio of the strength ofϕ50×h100 mm tend to stabilize gradually with the increase of age,and it is recommended that the maximum cement admixture is 12.0%.Under the same cement admixture or fly ash admixture,the change curve of unconfined compressive strength of fly ash cement soil is similar in shape,and the compressive strength of cement soil with 12.0%fly ash admixture reaches the peak when the cement admixture is 8.0%and 12.0%;under the same age of regeneration,the effect of FGD gypsum dosage in improving the compressive strength of cement soil is relatively poor,and the unconfined compressive strength of FGD gypsum cement soil grows linearly with the increase of cement dosage,which is the same as cement dosage,but with the increase of cement dosage.The FGD gypsum dosage has a linear growth with the increase of cement dosage,and then decreases with the increase of FGD gypsum dosage,and the maximum value is obtained when the cement dosage is≥12.0%and the FGD gypsum dosage is 6.0%,and it is suggested that the maximum dosage of FGD gypsum is 4.0%;the frost resistance of fly ash hydromud is the best performance,and the lateral limit-free compressive strength and the residual mass ratio of Improved cement soil decrease linearly with the increase of the number of freezing and thawing.

关 键 词：改良水泥土 配合比设计 性能试验 评价 经济性 

分 类 号：U414[交通运输工程—道路与铁道工程]