干湿循环对固化污泥微观结构及强度的影响  

Effects of dry-wet cycles on microstructure and strength of solidified sludge

作　　者：何俊 管家贤 张磊 吕晓龙 张驰 HE Jun;GUAN Jiaxian;ZHANG Lei;LYU Xiaolong;ZHANG Chi(School of Civil Engineering,Architecture and Environment,Hubei University of Technology,Wuhan 430068,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068

出　　处：《水利水电科技进展》2022年第4期39-44,共6页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(41772332);湖北省技术创新专项重大项目(2017ACA090)。

摘　　要：为探索用作填埋场覆盖材料的固化污泥的干湿循环耐久性,开展了干湿循环条件下碱渣矿渣石灰固化污泥强度性质试验。结果表明:随着干湿循环次数的增加,水化反应持续进行,钙矾石、水铝钙石和水化硅酸钙等水化产物增多,试样孔隙体积减小,结构趋于密实;总体来看,固化污泥的无侧限抗压强度随着干湿循环次数的增加呈增大趋势,7次干湿循环后试样的强度为干湿循环前的1.16~1.45倍;从微观结构和无侧限抗压强度来看,碱渣矿渣石灰固化污泥具有良好的干湿耐久性。To explore the dry-wet durability of solidified sludge in the application of landfill cover,solidification strength tests of soda residue-slag-lime were performed under the condition of dry-wet cycles.The results show that the hydration reaction continues with the increase of dry-wet cycles,leading to increasing amount of hydration products including ettringite,hydro aluminite and calcium silicate hydrate,decreasing pore volume,and dense microstructure.In general,the unconfined compressive strength has an increase trend with the dry-wet cycles.The strength after the seventh dry-wet cycle is 1.16 to 1.45 times of that before the cycles.From the perspective of microstructure and unconfined compressive strength,sludge solidified with soda residue-slag-lime has good durability under dry-wet cycles.

关 键 词：碱渣 固化污泥 干湿循环 无侧限抗压强度 干湿耐久性 微观结构 

分 类 号：P642[天文地球—工程地质学]