大掺量自来水厂污泥粉对混凝土强度和微观结构的影响  

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

作　　者：汤薇[1] 石锦炎 何智海 詹培敏 刘宝举[2] 杨效登[5] TANG Wei;SHI Jinyan;HE Zhihai;ZHAN Peimin;LIU Baoju;YANG Xiaodeng(Department of Architecture and Design Art,Shaoxing Vocational and Technical College,Shaoxing 312000,China;School of Civil Engineering,Central South University,Changsha 410075,China;College of Civil Engineering,Shaoxing University,Shaoxing 312000,China;Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education,Tongji University,Shanghai 201804,China;School of Chemistry and Chemical Engineering,Qilu University of Technology,Jinan 250353,China)

机构地区：[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

出　　处：《复合材料学报》2022年第5期2369-2377,共9页Acta Materiae Compositae Sinica

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

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。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.

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 

分 类 号：TU528[建筑科学—建筑技术科学]