GS固化剂加固海底淤泥耐久性及微观机理  

Durability and Micromechanism of Submarine Silt Stabilized by the GS Agent

作　　者：李光耀 张振[1] 叶观宝[1] 单卫良 舒欢 LI Guangyao;ZHANG Zhen;YE Guanbao;SHAN Weiliang;SHU Huan(Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Shanghai Baofen Material Technology Co.,Ltd,Shanghai 200000,China;Jinmao Jiangsu Anhui Enterprise Management(Tianjin)Co.,Ltd.,Nanjing 320100,China)

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]上海宝粉材料科技有限公司,上海200000 [3]金茂苏皖企业管理(天津)有限公司,江苏南京320100

出　　处：《材料科学与工程学报》2023年第5期723-729,共7页Journal of Materials Science and Engineering

基　　金：上海市科技计划资助项目(22ZR1466600);国家自然科学基金项目资助项目(41972272&41772281)。

摘　　要：由于海洋环境和海底淤泥土性的特殊性,海底淤泥固化土的耐久性问题是工程中普遍关注的问题。本研究以中国香港某工程的海底淤泥为加固对象,开展了一种新型固化剂(称之为GS固化剂)加固海底淤泥的耐久性研究,并与水泥固化土进行对比分析。通过无侧限抗压试验,获得了两种固化土在干湿循环和硫酸盐浸泡条件下的强度衰减。结果表明,干湿循环条件下GS固化土的耐蚀系数约为水泥土的1.05~1.10倍。硫酸盐浸泡条件下水泥土发生崩解,GS固化土的耐蚀系数为18.6%~71.2%。提高固化剂掺量和增加标准养护时间,有助于提高固化土的耐久性。同时,通过背散射衍射(BES)试验和X射线衍射仪(XRD)对两种固化土的耐久性微观机理进行分析,发现相较于水泥土,GS固化土的水化程度高、孔隙率少、结构更稳定。Due to the particularity of marine environment and submarine silt,the durability of stabilized submarine silt is one of the greatest concerns in application.Taking the ground improvement project of submarine silt in a certain project in Hong Kong as the reinforcement object,this paper studies the durability of submarine silt stabilized by a novel binder(called GS agent,G and S are the initials of gypsum and slag,respectively),and compares it with cement stabilized soil.Unconfined compression tests were conducted to investigate the strength attenuation of stabilized soils under dry-wet cycle and sulfate soaking.The results showed that the corrosion resistance coefficient of GS stabilized soil under dry-wet cycle was about 1.05 to 1.10 times that of the cement stabilized soil.Under sulfate attack,the cement stabilized soil completely disintegrated,while the GS stabilized soil still had a certain strength with corrosion resistance coefficients of 18.6%to 71.2%.Increasing the binder cement and curing time were beneficial to improving the durability of stabilized soil.Meanwhile,scanning electron microscopy backscatter(BES)test and X-ray diffraction(XRD)analysis were conducted to investigate the micro mechanism of durability of soils stabilized by GS agent and cement.It is found that the GS stabilized soil had a high degree of hydration,less porosity and more stable structure.

关 键 词：GS固化剂 海底淤泥 土体固化 工业固废 耐久性 微观机理 

分 类 号：TU472[建筑科学—结构工程]