摘要
为了解决低剂量水泥单独固化高含水率海相软土早期强度不足及固废碱渣资源化利用率低等问题,采用水泥、碱渣联合固化高含水率软土。通过30种不同质量配比的无侧限抗压强度试验得出,水泥-碱渣固化高含水率海相软土试样的无侧限抗压强度不仅与水泥、碱渣的掺量有关,还受到软土含水率的控制。在无侧限抗压强度研究基础上,推荐优选配比(碱渣、软土、水泥质量比为30∶70∶6),其7 d无侧限抗压强度为682.7 kPa。优选配比固化土的加州承载比(CBR)和回弹模量满足各级公路路基填料的指标要求。通过对高含水率软土中水的影响以及固化土级配和微观结构分析得出,水泥-碱渣固化高含水率软土的力学强度主要来源于碱渣吸水作用、碱渣骨架作用以及各组分材料化学反应的作用。化学作用产生的C-S-H,C-A-H和Aft等凝胶物质共同密实结构,提高固化土强度。研究结果可为固废物固化高含水率软土在路基中的应用提供理论支持。
Cement and soda residue were used together to solidify marine soft soil with high water content,to solve the issues of insufficient strength in the early stage of high water content marine soft soil solidified by low-dose cement alone,and low utilization rate of solid waste-soda residue.Unconfined compressive strength(UCS)of 30 different mix mass proportions were tested.The UCS of solidified soil was not only related to the content of cement and soda residue but also controlled by the water content of soft soil.Based on the UCS of the solidified soil,optimizing mix proportion(soda residue,soft soil and cement mass ratio of 30∶70∶6)was recommended,its 7d UCS was 682.7 kPa.The California bearing ratio(CBR)and resilience modulus of the solidified soil with optimizing mix proportion met the index of highway subgrade filling at all levels.By analyzing the influence of water in soft soil with high water content and the gradation and microstructure of solidified soil,it was concluded that the mechanical strength of solidified soil mainly came from the water absorption of soda residue,the skeleton of soda residue and the chemical reaction of each component material.The gel substances C-S-H,C-A-H,and Aft were produced by chemical action to jointly compact structure and improve strength.The results provide some theoretical support for the application of solid waste solidified soft soil with high water content in the subgrade.
作者
徐振红
杨天风
江舜根
于志龙
赵晓晴
张长杰
曾强忠
许传赓
XU Zhenhong;YANG Tianfeng;JIANG Shungen;YU Zhilong;ZHAO Xiaoqing;ZHANG Changjie;ZENG Qiangzhong;XU Chuangeng(School of Civil and Ocean Engineering,Jiangsu Ocean University,Lianyungang 222005,China;Lianyungang Railway Development Center,Lianyungang 222062,China;Jiangsu Institute of Marine Resources Development,Lianyungang 222005,China)
出处
《江苏海洋大学学报（自然科学版）》
CAS
2024年第3期34-42,共9页
Journal of Jiangsu Ocean University:Natural Science Edition
基金
江苏省重点研发计划项目(BE2021681)
连宿高速公路产学研项目(JOUH22089)
连云港市重点研发计划项目(SF2230)
江苏高校“青蓝工程”资助项目。
关键词
路基填料
高含水率海相软土
固化
碱渣
力学性质
需水性
机理
subgrade filler
marine soft soil with high water content
solidification
soda residue
mechanical property
water requirement
mechanism
