长沙理工大学学报（自然科学版）2023，Vol.20Issue(6)：17-26,10.DOI:10.19951/j.cnki.1672-9331.20220609001
AT固化粉土无侧限抗压强度及耐冻融性能研究
Study on unconfined compressive strength and freeze-thaw resistance of AT-solidified silty soil
摘要
Abstract
[Purposes]The paper aims to solve the poor engineering problems such as slurry turning and frost heave in the low liquid limit silt roadbed in the Northeast China.[Methods]A new type of aluminum tripolyphosphate(AT)curing agent based on water glass was used to improve the low liquid limit silt.The unconfined compressive strength test was carried out on the AT-solidified soil and compared with the water glass-solidified soil under the condition of curing for 28 days.Simultaneously,the freeze-thaw cycle test was carried out.Additionally,X-ray diffraction(XRD)and scanning electron microscope test(SEM)further explored the microscopic mechanism of its strength formation and freeze-thaw resistance.[Findings]The unconfined compressive strength of AT-solidified soil increases with the increase of the curing agent content,the compaction degree and the curing age;the unconfined compressive strength of AT-solidified soil with different curing agent contents tends to be stable after 7 times of the freeze-thaw cycle;compared with water glass,AT curing agent can produce more silicic acid gel and aluminum silicate produced by the reaction can effectively improve the water resistance and the unconfined compressive strength of the silt.[Conclusions]Compared with water glass,AT curing agent can improve the freeze-thaw resistance of silt,and AT-solidified soil has better mechanical properties.关键词
三聚磷酸铝固化剂/低液限粉土/水玻璃/无侧限抗压强度/冻融循环/微观机理Key words
aluminum tripolyphosphate curing agent/low liquid limit silt/water glass/unconfined compressive strength/freeze-thaw cycle/microscopic mechanism分类
交通工程引用本文复制引用
肖杰,何光锋,常锦,林佳毅..AT固化粉土无侧限抗压强度及耐冻融性能研究[J].长沙理工大学学报（自然科学版）,2023,20(6):17-26,10.基金项目
湖南省科技计划项目(2018TP2038) （2018TP2038）
中交第四公路工程局有限公司项目(20190810000) Project(2018TP2038)supported by Hunan Science and Technology Program （20190810000）
Project(20190810000)supported by CCCC Fourth Highway Engineering Bureau Co.,Ltd. （20190810000）
