水利水电技术（中英文）2023，Vol.54Issue(6)：189-201,13.DOI:10.13928/j.cnki.wrahe.2023.06.017
干湿、冻融循环作用下石灰-赤泥固化土的物理、力学和微观特性研究
Physical,mechanical,and micro-scale properties of the soil stabilized with lime-activated red mud under dry-wet and freeze-thaw cycles
摘要
Abstract
[Objective]Red mud is an industrial waste from the manufacturing process of alumina.It has caused various environ-mental issues,such as groundwater pollution and soil salinization.It is compelling to find a way to reuse red mud.In addition,one of the major problems associated with road materials is the loss of strength due to exposure to adverse environment,such as moisture((i.e.dry-wet)or temperature(i.e.freeze-thaw).[Methods]A method of using red mud activated by lime to sta-bilize subgrade soil(with and without NaOH)was presented.The mass and volume monitoring,unconfined compressive strength(UCS)test,nuclear magnetic resonance(NMR)test,and X-ray diffraction(XRD)test were carried out to evaluate physical,mechanical,and micro-scale properties of the specimens under dry-wet(D-W)cycle and freeze-thaw(F-T)cycle.[Results]The addition of NaOH increased the UCS by 204.6％～343.6％.The UCS of lime-red mud stabilized soil decreased with the in-crease of the number of D-W and F-T cycles.The D-W and F-T cycle resulted in a mass loss of 0.52％～2.06％and volume changes of 0.62％％～1.99％.The D-W cycle reduced the volume of pores,but the F-T cycle increased the volume of large pores.Calcium silicate hydrate was the main product of the soil stabilized with lime-red mud.[Conclusion]Test result indicated that the soil stabilized with lime-red mud has better resistance to D-W and F-T than plain lime stabilized soil.The percentage of strength loss,mass loss and volume changes of lime-red mud stabilized soil are lower than plain lime stabilized soil.Calcium sili-cate hydrate contribute to the improvement of resistance to D-W and F-T erosion.The finding will facilitate the application of red mud in road engineering.关键词
赤泥/石灰/固化土/干湿循环/冻融循环/抗剪强度/力学性能/核磁共振试验Key words
red mud/lime/soil stabilization/dry-wet cycle/freeze-thaw cycle/shear strength/mechanical properties/nuclear magnetic resonance test分类
土木建筑引用本文复制引用
李文涛,陈凤,肖衡林,李丽华,黄可..干湿、冻融循环作用下石灰-赤泥固化土的物理、力学和微观特性研究[J].水利水电技术（中英文）,2023,54(6):189-201,13.基金项目
Hubei University of Technology Outstanding Talent Fund Project(430100319) （430100319）
Innovation Group Project of Hubei Science and Technolo-gy Department(2020CFA046) （2020CFA046）
The National Natural Science Foundation of China(No.52278347)湖北工业大学高层次人才科研启动基金(430100319) （No.52278347）
湖北省科技创新群体项目(2020CFA046) （2020CFA046）
国家自然科学基金项目(52278347) （52278347）
