期刊论文

中文

科学技术与工程

1671-1815

2017

17

8

87-93

10.3969/j.issn.1671-1815.2017.08.014

11672216:国家自然科学基金 51474168:国家自然科学基金 Z014007:中国科学院重点实验室开放基金

本校为第一机构

为了研究水泥、煤矸石、黏土、纤维对污泥进行改性固化的规律,评价其作为填埋场衬垫防渗材料的可行性,通过干缩开裂实验,观察固化污泥的失水、体积收缩、开裂情况。采用低温氮气吸附试验,检测固化污泥试样的孔隙结构与比表面积。采用环境岩土柔性壁渗透试验,检测固化污泥的渗透系数。采用三轴剪切试验仪,检测固化污泥的抗剪强度。通过试验发现：污泥固化体的含水率变化范围为22.08%-150.48%;且随着含水率的降低,开裂因子逐渐增大。随着污泥固化体的体积收缩率增大,开裂因子总体呈增大趋势。污泥固化体的孔径曲线呈＂M＂型,双肩峰集中出现在3-5 nm和7-8.5 nm区间段。随着时间的增加,污泥固化体的...

To evaluate the feasibility of modified sludge used as landfill liner,the characteristics of sewage sludge modified by cement,coal gangue,clay and fiber were studied. Cracking,low temperature nitrogen adsorption,permeability and consolidated—undrained triaxial tests were performed to research the cracking factor,pore structure,hydraulic conductivity,and shear strength characteristic of modified sludge. The moisture content of modified sludge is from 22. 08% to 150. 48%,the cracking factor increases. With the increase of volume shrinkage rate,t...