硅酸盐通报2025，Vol.44Issue(2)：602-612,11.DOI:10.16552/j.cnki.issn1001-1625.2024.0980
高炉矿渣-电石渣复合改良膨胀土工程特性与机理研究
Engineering Property and Mechanism of Ground Granulated Blast Slag-Carbide Slag Composite Improved Expansive Soil
摘要
Abstract
Expansive soil is not suitable to be directly used for roadbed filling due to its characteristics of expansive softening by water absorption and shrinkage and cracking by water loss.The ground granulated blast slag(GGBS)and carbide slag(CS)were used to improve expansive soil.Through the compaction test,free expansion rate test,unconfined compressive strength test,and water stability test,the impacts of different ratios on the strength,water stability,and other engineering characteristics of improved expansive soil were studied.X-ray diffraction and scanning electron microscopy and other microscopic tests were carried out to study the composite improvement mechanism of GGBS and CS on expansive soil.The results show that the incorporation of GGBS and CS can inhibit the expansion characteristics of expansive soil and improve its strength and water stability.The composite improvement effect of 6％(mass fraction)GGBS and 6％(mass fraction)CS is the best,at this moment the free expansion rate is reduced to 11％after curing,the unconfined compressive strength is 2.84 MPa,and the water stability coefficient is 82.5％.Hydration reaction occurs between GGBS,CS,and expansive soil to form hydrated calcium silicate,hydrated calcium aluminate,and ettringite.Hydration products are cemented with each other,filling soil pores and bonding soil particles,making the soil denser,thereby improving the strength of improved expansive soil.The research results provide a reference for the application of GGBS and CS composite to improve expansive soil in roadbed engineering.关键词
膨胀土/高炉矿渣/电石渣/工程特性/改良机理/路基工程Key words
expansive soil/ground granulated blast slag/carbide slag/engineering property/improvement mechanism/roadbed engineering分类
建筑与水利引用本文复制引用
胡其志,李俊杰,陶高梁,李子天..高炉矿渣-电石渣复合改良膨胀土工程特性与机理研究[J].硅酸盐通报,2025,44(2):602-612,11.基金项目
国家自然科学基金项目(52078195) （52078195）
国家自然科学基金联合基金重点项目(U22A20232) （U22A20232）
