土木与环境工程学报（中英文）2024，Vol.46Issue(6)：183-191,9.DOI:10.11835/j.issn.2096-6717.2022.077
表面处理污泥渣料磨细粉水泥基材料活性激发及其机理
Activation and mechanism of pulverized surface treatment sludge
摘要
Abstract
In order to to improve the pozzolanic activity of the pulverized powder from the high temperature sintering slag of surface treatment sludge and construction residue,the effect and mechanism of Ca(OH)2 on mechanical properties and heavy metal leaching of Portland cement-based materials were studied,and the microstructure characteristics of the materials were analyzed by XRD,SEM,BET,TG and other microscopic testing techniques.The results show that when Ca(OH)2 content is 0.6%～0.8%of the total mass of ground powder cement-based materials,the mechanical properties of cement-based materials mixed with grinding powder are better.At 60 days,the flexural strength and compressive strength increased by 11.0%and 7.8%,respectively.Microscopic test results show that a small amount of Ca(OH)2 can not only increase the specific surface area of ground powder cement-based materials'hardened slurry,but also increase the number of hydration products,and improve the structural compactness of hardened slurry.However,when the content of Ca(OH)2 exceeds 0.8%of the total mass of cement-based hardened slurry,it has a negative effect on the structure and properties of cement-based materials.It is also found that the addition of Ca(OH)2 can reduce the leaching concentration of harmful heavy metals in cement-based materials with the addition of the ground powder.The leaching rates of Cu,Ni and Zn were 17.5%,13.0%and 40.8%lower than those of blank group.It can ensure that the leaching values of harmful heavy metals Cu,Ni,Zn and Cr in cement-based materials mixed with grinding powder are lower than the leaching concentration limits specified in the Technical Specification for Coprocessing of Solid Waste in Cement Kiln(GB/T 30760-2014).关键词
表面处理污泥/氢氧化钙/活性激发/重金属浸出浓度/建筑渣土Key words
surface treatment sludge/calcium hydroxide/active excitation/heavy metal leaching concentra-tion/architecture sediment分类
建筑与水利引用本文复制引用
成伟,高琦,张宇驰,巴明芳,初汉增..表面处理污泥渣料磨细粉水泥基材料活性激发及其机理[J].土木与环境工程学报（中英文）,2024,46(6):183-191,9.基金项目
浙江省公益技术项目(LGF22E080020) （LGF22E080020）
宁波市"科技创新2025"重大专项(2020Z100)Zhejiang Public Welfare Technology Project(No.LGF22E080020) （2020Z100）
Ningbo"Science and Technology Innova-tion 2025"Major Special Project(No.2020Z100) （No.2020Z100）
