土木与环境工程学报（中英文）2024，Vol.46Issue(6)：9-15,7.DOI:10.11835/j.issn.2096-6717.2022.103
木质素改良膨胀土的工程特性及微观机理
Engineering characteristics and microscopic mechanism of lignin improved expansive soil
摘要
Abstract
In order to explore the effect of lignin on weak expansive soil in Xinxiang area,the physical and mechanical properties of weak expansive soil in Xinxiang area with different lignin contents were examined by laboratory test and ESEM(Environmental Scanning Electron Microscope)test.The microstructure characteris-tics and pore morphology characteristics of the improved soil with different lignin contents were qualitatively described and quantitatively characterized.Based on the XRD(X-Ray Diffraction)testing results,the changes of mineral composition in the improved soil were discussed,so as to reveal the interaction mechanism between lignin and soil.The test results show that when lignin is used to improve expansive soil,3%lignin has the optimal effect on inhibiting the expansion,and simultaneously the compressive strength reaches the maximum,while the compressive strength of soil decreases after exceeding the optimal dosage.The pore structure in the soil is complex,the pore arrangement is disordered and the orientation is less satisfactory.The lignin cement can fill the soil pores to make its microstructure more dense.Lignin plays a cementing role in expansive soil,and cannot react with expansive soil to form new mineral components.It has satisfactory stability when interacting with soil,which belongs to physical improvement.As an efficient and environmentally friendly modifier,lignin can effectively improve the basic engineering properties of expansive soil,of which further study is promising.关键词
改良土/膨胀土/木质素/微观特性/改良机理Key words
improved soil/expansive soil/lignin/micro characteristics/improvement mechanism分类
建筑与水利引用本文复制引用
王欢,曹素娟,曹义康,邱翱博..木质素改良膨胀土的工程特性及微观机理[J].土木与环境工程学报（中英文）,2024,46(6):9-15,7.基金项目
河南省高等学校重点科研项目(18A580002) （18A580002）
开封市科技发展计划项目(1801004) （1801004）
甘肃省交通运输厅科研项目(2013-07)Key Scientific Research Project of Higher Education Institutions of Henan Province(No.18A580002) （2013-07）
Science and Technology Development Program of Kaifeng(No.1801004) （No.1801004）
Research Project of Gansu Provincial Department of Transport(No.2013-07). （No.2013-07）
