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干湿循环作用下固化淤泥的抗剪强度变化规律
刘文化, 舒俊炜, 孙秀丽, 华渊, 李芳菲
江南大学 环境与土木工程学院, 江苏 无锡 214122
摘要:
河、湖等的疏浚淤泥多采用固化方式进行处理。针对固化淤泥材料的干湿稳定性问题,系统开展了干湿循环作用下水泥固化疏浚淤泥的抗剪强度特性试验研究,揭示了固化淤泥在干湿循环作用下抗剪强度的变化机理,并对各影响因素进行了定量分析。结果表明:随着干湿循环次数的增加,固化淤泥的抗剪强度逐渐变化,且先快后慢,最后趋于稳定;干湿循环后,水泥掺量100 kg/m3固化淤泥试样的抗剪强度降低,而水泥掺量150、200 kg/m3试样干湿循环后的抗剪强度不降反增,说明干湿循环对固化淤泥的影响与水泥的掺量有关。较高的干燥温度促进了水泥水化,从而导致水化产物增加,固化淤泥的抗剪强度增大;同时,干湿循环过程中,微裂缝的发育导致固化淤泥的抗剪强度降低,干湿循环对固化淤泥抗剪强度的影响取决于二者的综合作用。
关键词:  固化  疏浚淤泥  干湿循环  抗剪强度  机理分析
DOI:10.11835/j.issn.2096-6717.2019.066
分类号:TU411
基金项目:国家自然科学基金(51709129);江苏省自然科学基金(BK20170187);中央高校专项资金(JUSRP11713);大连理工大学国家重点实验室开放基金(LP1613)
Shear strength variations of solidified sludge during drying-wetting cycles
Liu Wenhua, Shu Junwei, Sun Xiuli, Hua Yuan, Li Fangfei
School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, Jiangsu, P. R. China
Abstract:
Solidification is a major treatment method for the dredged sludge from rivers and lakes. In order to investigate the wetting/drying stability of the solidified materials, a series of tests measuring the shear strengths of solidified dredged sludge during drying/wetting process were performed. Besides, the variation pattens of the shear strength were revealed and the influential factors are analyzed quantitatively. The test results show that the shear strength of solidified dredged sludge changes gradually with the increasing number of drying/wetting cycles, and finally tends to be stable. The shear strength of solidified dredged sludge with a cement content of 100 kg/m3 decreases after drying/wetting, while the shear strengths of solidified dredged sludge with cement contents of 150 and 200 kg/m3 increase after drying/wetting, which indicates that the influence of drying/wetting on the mechanical behaviors of sludge relates to the cement content. A higher drying temperature promotes the hydration reaction of cement during the drying/wetting process. Therefore, it resulted in the increase of hydration products and the increase in shear strength. However, the development of crack inside the material during drying/wetting leads to the decrease of its shear strength. The overall influence of drying/wetting on the shear strength of solidified sludge depends on the compromises of the two factors.
Key words:  solidification  dredged sludge  drying/wetting cycle  shear strength  mechanism analysis
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