文献类型：期刊文献

英文题名：Recycling hazardous water treatment sludge in cement -based construction materials: Mechanical properties, drying shrinkage, and nano-scale characteristics

作者：He, Zhi-hai[1,2];Yang, Ying[1];Yuan, Qiang[3];Shi, Jin-yan[3];Liu, Bao-ju[3];Liang, Chao-feng[1,2];Du, Shi-gui[4]

机构：[1]Shaoxing Univ, Coll Civil Engn, Shaoxing 312000, Peoples R China;[2]Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Peoples R China;[3]Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China;[4]Ningbo Univ, Sch Civil & Environm Engn, Ningbo 315211, Zhejiang, Peoples R China

年份：2021

卷号：290

外文期刊名：JOURNAL OF CLEANER PRODUCTION

收录：SCI-EXPANDED(收录号：WOS:000620276300007)、、EI(收录号：20210309776764)、Scopus(收录号：2-s2.0-85099229837)、WOS

基金：The authors would like to acknowledge the Natural Science Foundation of Zhejiang Province (Grant No. LY20E020006), National Natural Science Foundation of China (Grant No. 51602198) and the International Scientific and Technological Cooperation Project of Shaoxing University (Grant No. 2019LGGH1009) for their financial support to the work present in this paper.

语种：英文

外文关键词：Mortar; Solid waste; Water treatment sludge; Mechanical properties; Nanoindentation

外文摘要：Water treatment sludge (WTS) management is a growing global problem, which is often disposed as a hazardous material in landfill space. This paper aims to use modified WTS as a novel supplementary cementitious material, by determining the effects of calcined WTS addition on the composition and performance of Portland cement composites. The effect of WTS to replace cement partially by weight on the mechanical properties and drying shrinkage of specimens has experimentally been studied, and the internal microstructure is also determined by scanning electron microscope and nanoindentation techniques. The results showed that mortar with 10% modified WTS presented higher 90-day compressive strength although specimens with 20% and 30% modified WTS showed 10.54% and 16.20% reduction compared to the control group. Meanwhile, the modified WTS has pozzolanic activity and can react with cement hydration products to increase the compactness of the microstructure, thereby reducing the drying shrinkage of the pastes (10% modified WTS). When 10% of the cement was replaced by modified WTS, the volume fraction of unhydrated clinker and pore phase in the matrix decreased significantly, while the volume fraction of C-S-H phase increased. In addition, the interface transition zone (ITZ) width of the specimen (10% WTS) is the smallest, and as the replacement rate of modified WTS increases, the ITZ width of the specimen increases significantly. This paper proves that the modified WTS, as a supplementary cementitious material, can be considered a feasible and sustainable alternative for use in the building materials. (c) 2021 Elsevier Ltd. All rights reserved.