活性氧化镁碳化固化粉质黏土微观机制
Microstructural mechanism of reactive magnesia carbonated and stabilized silty clays
摘要
Abstract
In this study,reactive magnesia (MgO) is used as a binder to carbonate and stabilise silty clay.The changes of unconfined compressive strength,soil pH,carbonation products,and microstructure of the silty clay carbonated and stabilized by reactive MgO are studied at different carbonation time and initial water contents through the experiments of unconfined compression,pH,X-ray diffraction,mercury intrusion porosimetry and scanning electron microscope,respectively.The micromodel of carbonation reaction of silty clay is proposed according to the intrinsic relationships between the strength of carbonated soil and contents of carbonation products as well as the cumulative pore volume.The results show that with the increase of the carbonation time or the decrease of the initial water content of carbonated samples,the carbonation products increase,and the strength of reactive MgO stabilized soil gradually increases with the decrease of cumulative pore volume.Moreover,the pH values of reactive MgO-stabilized soil decreased with the increase of the carbonation time,whereas the initial water contents show no obvious changes.Finally,the micromodel of carbonation reaction of silty clay is established,and the highest strength of reactive MgO-stabilized silty clay is determined after about 6 hours of carbonation.关键词
活性氧化镁/粉质黏土/碳化/土体固化/微观机制Key words
reactive magnesia/silty clay/carbonation/soil stabilisation/microstructural mechanism分类
建筑与水利引用本文复制引用
刘松玉,曹菁菁,蔡光华..活性氧化镁碳化固化粉质黏土微观机制[J].岩土力学,2018,39(5):1543-1552,1563,11.基金项目
国家自然科学基金(No.41330641,No.451279032) （No.41330641,No.451279032）
国家重点研发计划项目(No.42016YFC0800201) （No.42016YFC0800201）
江苏省交通工程建设局科技项目(No.2018T01) （No.2018T01）
"十二五"国家科技支撑计划项目(No.2012BAJ01B02-01) （No.2012BAJ01B02-01）
江苏省普通高校研究生科研创新计划资助项目(No.KYLX_0147). This work was supported by the National Natural Science Foundation of China(41330641,51279032) （No.KYLX_0147）
the National Key Research and Development Program of China (2016YFC0800201) （2016YFC0800201）
the Science and Technology Project of Jiangsu Traffic Engineering Construction Bureau (2018T01) （2018T01）
the Key Projects in the National Science & Technology Pillar Program during the Twelfth Five-year Plan Period(2012BAJ01B02-01) and the Fundamental Research Funds for the Jiangsu Provincial Innovation Foundation for Postgraduate of Regular Institutions of Higher Learning(KYLX_0147). （2012BAJ01B02-01）
