大连理工大学学报2015，Vol.55Issue(3)：312-318,7.DOI:10.7511/dllgxb201503013
污泥灰改性黏土胀缩与开裂变形特性
Swelling ,shrinking and cracking properties of modified clay containing sewage sludge ash
摘要
Abstract
In order to deal with the landfill liner which was corroded by pollutants and evaluate the feasibility of using the residual sludge in sew age treatment plant ,tests w ere performed to analyze the swelling ,shrinking and cracking properties of modified clay which contained 1%-5% sewage sludge ash (SSA) under the action of acid and alkali chemical solutions .pHs of chemical solutions used in the tests were 5 ,6 ,8 ,9 separately ,and the conditions were simulated indoors .The liquid limit and plastic limit of modified clay were tested by moisture content test ,and the consistency limit of samples was analyzed .The swelling rate and shrinking rate of modified clay were tested by swelling test and shrinking test ,and the swelling and shrinking properties were analyzed .The cracking properties of modified clay were tested by cracking test .Based on the results of soil tests , the liquid limit of modified clay is about 43 .5% .With the increasing of SSA contents ,plastic limit increases and plastic index reduces ,the maximum liquid limit and plastic limit of modified clay containing 5% SSA which is polluted by acid and alkali chemical solution are 45 .9% ,22 .8% respectively .The minimum swelling rate and shrinking rate are 5 .66% , 2 .14% of modified clay containing 5% SSA and 3% SSA respectively .Moreover , the swelling rate is reduced by 12 .7%-36 .5% and the shrinking rate is increased by 33 .8%-75 .7% when polluted by acid and alkali chemical solutions . After dry-wet circulation for four times ,the cracking index factor (CIF) is 80 .71% larger than that of the end of first dry-wet circulation of clay sample .However ,it is only 43 .47% larger than that of the end of first dry-wet circulation of modified clay containing 3% SSA .Thus ,the modified clay can be used as landfill liner material and the best content of SSA is 3% .关键词
污泥灰/改性黏土/膨胀收缩/开裂因子Key words
sewage sludge ash/modified clay/swelling and shrinking/cracking index factor分类
资源环境引用本文复制引用
董祎挈,陆海军..污泥灰改性黏土胀缩与开裂变形特性[J].大连理工大学学报,2015,55(3):312-318,7.基金项目
湖北省教育厅科学研究计划资助项目(D20141703 ) . （D20141703 ）
