Influence of high-volume water treatment plant sludge powder on strength and microstructure of concrete

被引：0

作者：

Tang W. ^{[1
]}

Shi J. ^{[2
]}

He Z. ^{[3
]}

Zhan P. ^{[4
]}

Liu B. ^{[2
]}

Yang X. ^{[5
]}

机构：

[1] Department of Architecture and Design Art, Shaoxing Vocational and Technical College, Shaoxing

[2] School of Civil Engineering, Central South University, Changsha

[3] College of Civil Engineering, Shaoxing University, Shaoxing

[4] Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai

[5] School of Chemistry and Chemical Engineering, Qilu University of Technology, Jinan

来源：

Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2022年 / 39卷 / 05期

关键词：

Concrete; Mechanical properties; Microstructure; Nano-scale characteristics; Water treatment plant sludge powder;

D O I：

10.13801/j.cnki.fhclxb.20210608.002

中图分类号：

学科分类号：

摘要：

The calcined water treatment plant sludge powder (CWTS) was used to replace part of the cement to prepare high-volume sludge concrete, and the effect of the high-volume CWTS on the mechanical properties and microstructure of concrete was studied. The results show that although the high-volume CWTS is detrimental to the development of the 28-days compressive strength of concrete, 20wt% and 40wt% of the CWTS can significantly improve the 90-days compressive strength of concrete. The CWTS has pozzolanic reactivity and filling effect, which makes the 90-days pore structure of concrete mixed with 20wt%-40wt%CWTS significantly refined, and the harmful pore volume (>1 µm) is significantly reduced. Meanwhile, it is observed from the nanoscale characteristics that adding 20wt%CWTS can significantly reduce the content of pore phase and unhydrated phase in the matrix, and increase the volume fraction of C-S-H phase, especially the high-density C-S-H phase. In addition, the addition of 20wt%CWTS can reduce the width of the interface transition zone (ITZ) by 20%, the addition of 40wt%CWTS and the control group (0wt%CWTS) have similar ITZ width. Therefore, using a large amount (20wt%-40wt%) of CWTS to replace cement to prepare concrete not only has better economic and environmental benefits, but also benefits the improvement of its 90-days mechanical properties and microstructure. Copyright ©2022 Acta Materiae Compositae Sinica. All rights reserved.

引用

页码：2369 / 2377

页数：8

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