新型CVC固化剂固化淤泥结构表征与路用性能  

Microstructures and road performance of silt stabilized by new CVC stabilizer

作　　者：王朝辉[1] 赵娟娟[1] 曾伟[2] 王新岐[2] 狄升贯[2] 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]天津市市政工程设计研究院,天津300051

出　　处：《中南大学学报（自然科学版）》2014年第3期917-924,共8页Journal of Central South University:Science and Technology

基　　金：天津市交通科技项目(2010-01)

摘　　要：将蛭石作为改性剂应用于淤泥固化处治,并添加水泥、生石灰等材料,制备出一种新型CVC固化剂。借助TEM试验、FTIR试验和XRD试验,全面分析了CVC固化淤泥时发挥功能的微观机理;基于击实试验、加州承载比试验和无侧限抗压强度试验,确定了固化剂的最佳配比;采用抗压回弹模量试验、耐水试验和抗冻融试验评价了固化淤泥的路用性能。结果表明:蛭石粉可均匀分散在淤泥土中,增强淤泥内部稳定性;蛭石可有效提高淤泥的最佳含水量,添加水泥和生石灰可有效弥补蛭石引起的强度损失;CVC固化剂的最佳配比为8%水泥+4%蛭石+3%生石灰;CVC固化剂对淤泥路用性能改善效果较优,具有较强实用价值和应用前景;To improve the optimum water content of silt and overcome the difficulty of compaction when silt is used in highway subgrade engineering, the stabilizer named as CVC was prepared by mixing cement, vermiculite and quick lime. The microstructures of stabilizer and stabilized silt were characterized by transmission electron microscope （TEM）, fourier transform infrared spectroscopy （FTIR） and X-Ray diffraction （XRD）. Through compaction test, California bearing ratio test （CBR） and unconfined compressive test, the most appropriate composition of CVC stabilizer were determined. Based on this, compression modulus of resilience test, water resistance test, freezing and thawing test were carded out to evaluate the road performance of the stabilized silt. The results show that vermiculite can disperse evenly and forms a stable structure with silt. The water in silt can be absorbed effectively by vermiculite, and the loss of strength caused by vermiculite can be made up with the adding of cement and quick lime, and finally the properties of the stabilized silt are improved. The optimum proportion of CVC stabilizer is 8% for cement, 4% for vermiculite and 3% for quick lime by weight of silt. Compared with other stabilizer, the road performance of CVC is better, and it is worth being popularized with a promising application future.

关 键 词：CVC固化剂 淤泥 微观机理 路用性能 

分 类 号：U414.1[交通运输工程—道路与铁道工程]