碱激发垃圾焚烧底灰地聚物的制备及其水化特性研究
Preparation and Hydration Characteristics of Alkali Excited Municipal Solid Waste Incineration Bottom Ash Geopolymer
刘刚 1李心诚 1刘金军 2蹇守卫 1范璐璐 3涂亮亮3
作者信息
- 1. 武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070;武汉理工大学材料科学与工程学院,武汉 430070
- 2. 武汉理工大学材料科学与工程学院,武汉 430070
- 3. 武汉理工大学材料科学与工程学院,武汉 430070;深圳市特区建工集团有限公司,深圳 518000
- 折叠
摘要
本文采用城市垃圾焚烧底灰(BA)、偏高岭土和矿粉作为原料,NaOH和水玻璃作为碱激发剂来制备底灰地聚物,重点研究了不同碱含量、BA掺量对聚合物抗压强度及水化特性的影响.研究表明:当碱含量达7％(质量分数,下同)时,过量的钠与活性钙、活性硅和铝反应,从而形成大量低强度N-A-S-H,使底灰地聚物强度下降;当碱含量固定、BA掺量达到80％时,底灰地聚物的强度大幅度降低.对于底灰而言,其聚合物体系对重金属离子具有显著的固化效果.因此,采用BA制备底灰地聚物对城市固废绿色再生利用和环境保护具有重要意义.
Abstract
To prepare the bottom ash geopolymer,municipal solid waste incineration bottom ash(BA),metakaolin and granulated blast furnace slag were selected as raw materials,and NaOH and water glass were adopted as alkali activators.The effects of different alkali content and BA content on compressive strength of geopolymer and hydration characteristics were mainly investigated.The results show that,when the alkali content reaches 7％(mass fraction,the same below),the reaction between excess sodium and active silicon,calcium and aluminum causes a large amount of low-strength N-A-S-H,which decreases the strength of bottom ash geopolymer.When the alkali content remains constant and the BA content reaches 80％,the strength of bottom ash geopolymer decreases substantially.Regarding bottom ash,its geopolymer system has a significant curing effect on heavy metal ions.Therefore,bottom ash geopolymer preparing by BA is of great significance for green recycling of municipal solid waste and environmental protection.
关键词
碱激发/垃圾焚烧底灰/地聚物/强度/重金属固化Key words
alkali excited/municipal solid waste incineration bottom ash/geopolymer/strength/heavy metal solidification引用本文复制引用
基金项目
海南省科技计划三亚崖州湾科技城联合项目(520LH016)
湖北省科学技术厅重点研发计划(2021BCA126)
国家自然科学基金(52068061)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据