东南大学学报（自然科学版）2025，Vol.55Issue(3)：774-782,9.DOI:10.3969/j.issn.1001-0505.2025.03.018
滨海氯盐渍土路用改性中铝酸三钙作用机制
Action mechanism of tricalcium aluminate in coastal chloride-saline soil modification as road material
摘要
Abstract
For the problem of road performance degradation caused by the influence of hygroscopic properties of chloride-saline soil subgrade,the road performance of the lime and high-alumina cement(primarily com-posed of calcium aluminate,C3A)co-modified saline soils was discussed.The water absorption of the modi-fied soil with C3A was analyzed.The efficiency of chloride fixation was assessed.The mechanism of Friedel's salt formation and chlorine fixation was revealed.The results indicate that the road performance modified by 3%lime+3%high alumina cement satisfies the specification requirements.C3A can effectively bind chloride ions to form Friedel's salt for the chemisorption mechanism.The chloride ion fixation of the modified soil with 6%C3A can reach 40.0%after 28 days'curing.This modification significantly reduces osmotic suction,inhibits the water migration ability and weakens the soil's hygroscopic properties.Materials with C3A(such as high-aluminum cement)can be used to modify the coastal chlorine-saline soils to bind chlorine ions,weaken the water absorption characteristics of chloride-saline soil,and improve the service performance of the sub-grade.关键词
氯盐渍土/高铝水泥/铝酸三钙/路用改性/固氯机制Key words
chlorine saline soils/high-alumina cement/tricalcium aluminate/road modification/chlorine fixation mechanism分类
交通工程引用本文复制引用
邓永锋,戴昊,朱向阳,刘发,英姿..滨海氯盐渍土路用改性中铝酸三钙作用机制[J].东南大学学报（自然科学版）,2025,55(3):774-782,9.基金项目
国家自然科学基金资助项目(42272322,52278334). （42272322,52278334）
