文献类型：期刊文献

英文题名：Environmental behavior and engineering performance of self-developed silico-aluminophosphate geopolymer binder stabilized lead contaminated soil

作者：Pu, Shaoyun[1,2];Duan, Wei[3];Zhu, Zhiduo[2];Wang, Wei[1];Zhang, Chen[2];Li, Na[1];Jiang, Ping[1];Wu, Zhonghu[4]

机构：[1]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Zhejiang, Peoples R China;[2]Southeast Univ, Sch Transportat, Nanjing 211189, Jiangsu, Peoples R China;[3]Taiyuan Univ Technol, Sch Civil Engn, Taiyuan 030024, Shanxi, Peoples R China;[4]Guizhou Univ, Coll Civil Engn, Guiyang 550025, Guihzou, Peoples R China

年份：2022

卷号：379

外文期刊名：JOURNAL OF CLEANER PRODUCTION

收录：SCI-EXPANDED(收录号：WOS:000878670900005)、、EI(收录号：20224413020714)、Scopus(收录号：2-s2.0-85140460710)、WOS

基金：The authors express their deep gratitude to the Journal of Cleaner Production editors and reviewers for their constructive suggestion and kind help in improving the quality of the manuscript.

语种：英文

外文关键词：Lead contaminated soil; Solidification; stabilization; APG binder; Toxic leaching; Mechanical performance; Acid and alkali resistance; Microscopic mechanism

外文摘要：A silico-aluminophosphate geopolymer (APG) binder was developed for Pb2+ solidification/stabilization (S/S) treatment in our previous study, but the related performance of the APG stabilized Pb2+ contaminated soil was not investigated. This study investigates the environmental behavior and engineering properties of APG binder stabilized Pb2+ contaminated soil, and compares the S/S effect with cement and alkali-activated geopolymer cement by unconfined compressive strength, toxicity leaching, and pH-dependent tests, also explores the microscopic and mineral properties using scanning electron microscopy (SEM) and X-ray diffraction (XRD) tests. Results showed that the compressive strength of APG binder stabilized soil was higher than that of cement and alkali-activated geopolymer cement, the compressive strength increased with an increased APG binder content, increased first and then decreased with the Pb2+ content increasing, reaching its maximum value when the Pb2+ content was 2.0%. Under regular environment, the S/S effect of APG binder was basically consistent with that of alkali-activated geopolymer cement, in strong acid (pH = 2) and strong alkali (pH = 13) environment, the APG binder exhibited better S/S effect. The Pb2+ leaching in soil stabilized with the APG binder prepared by solid powder activator was higher at 7, 14 days, but basically the same as that of using liquid activator at 28 days. The Pb2+ leaching increased with electrical conductivity increasing, and there was a good correlation between Pb2+ leaching and electrical conductivity. SEM and XRD analysis showed that different binders stabilized contaminated soil showed different morphology and mineral composition, Lead phosphate compound was formed in APG stabilized soil. In general, the APG binder has a good application prospect in treating contaminated soil under extremely acidic environment.