文献类型：期刊文献

中文题名：大掺量自来水厂污泥粉对混凝土强度和微观结构的影响

英文题名：Influence of high-volume water treatment plant sludge powder on strength and microstructure of concrete

作者：汤薇[1];石锦炎[2];何智海[3];詹培敏[4];刘宝举[2];杨效登[5]

机构：[1]绍兴职业技术学院建筑与设计艺术学院,绍兴312000;[2]中南大学土木工程学院,长沙410075;[3]绍兴文理学院土木工程学院,绍兴312000;[4]同济大学先进土木工程材料教育部重点实验室,上海201804;[5]齐鲁工业大学化学与化工学院,济南250353

年份：2022

卷号：39

期号：5

起止页码：2369

中文期刊名：复合材料学报

外文期刊名：Acta Materiae Compositae Sinica

收录：CSTPCD、、CSCD2021_2022、EI(收录号：20222112159629)、Scopus、北大核心、CSCD、北大核心2020

基金：国家自然科学基金(51602198);浙江省自然科学基金(LY20E020006)。

语种：中文

中文关键词：自来水厂污泥粉;混凝土;力学性能;纳米尺度特征;微观结构

外文关键词：water treatment plant sludge powder;concrete;mechanical properties;nano-scale characteristics;microstructure

中文摘要：以煅烧后的自来水厂污泥粉(CWTS)取代部分水泥制备大掺量污泥粉混凝土,研究了大掺量CWTS对于混凝土强度、孔结构和纳米力学性能的影响。结果表明:尽管大掺量CWTS不利于混凝土的28天抗压强度发展,但是20wt%和40wt%的CWTS能够增强混凝土的90天抗压强度;由于CWTS的火山灰活性和填充作用,掺有20wt%~40wt%CWTS的混凝土90天孔结构被明显细化,大于1μm的孔隙含量明显减少;同时,从纳米尺度特征中观察到掺加20wt%CWTS能够明显降低基体中孔隙相和未水化相含量,并提高C?S?H相的体积分数,特别是高密度C?S?H相;此外,掺加20wt%的CWTS能够使界面过渡区(ITZ)宽度相对降低20%,并且掺加40wt%CWTS的实验组与对照组(0wt%CWTS)具有相似的ITZ宽度。由此可见,使用大掺量(20wt%~40wt%)CWTS取代水泥制备混凝土,不仅具备较好的经济和环境效应,也有益于其90天力学性能和微结构的改善。

外文摘要：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(>1μm)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.