{"title":"评估用硫铝酸盐水泥固化城市固体废物焚烧飞灰的生态砂浆的性能和可持续性","authors":"","doi":"10.1016/j.conbuildmat.2024.138613","DOIUrl":null,"url":null,"abstract":"<div><div>Municipal Solid Waste Incineration Fly Ash (MSWI-FA) contains heavy metals, dioxins, and hazardous substances, making it a hazardous waste. The application of solidification/stabilization (S/S) treatment using chelating agents is widespread due to its high efficiency. However, this treatment is associated with high solidification costs. In this study, an attempt was made to solidify MSWI-FA using sulphoaluminate cement (SAC). Firstly, the effects of varying substitution rates of MSWI-FA on the workability, mechanical properties, durability and heat of hydration of ecological cement mortar (EM) were investigated. Secondly, the microstructure of the EM was investigated in order to ascertain the mechanism of solidification of the MSWI-FA via the SAC. Finally, the economic and environmental benefits of MSWI-FA as an alternative to SAC for the production of EM were evaluated using the material sustainability index. Results show that adding MSWI-FA decreases EM’s workability and mechanical properties, with compressive and flexural strength reductions between 6.87 % and 26.16 % and 5.74–36.74 %, respectively. Durability also declines, evidenced by increased drying shrinkage and chloride migration by 26.79–46.41 % and 11.05–48.19 %, respectively. A slower hydration rate reduces the total heat of hydration by 1.82–7.22 %, indicating lower cement hydration. The porosity and pore size increase, deteriorating the pore structure. However, SAC effectively solidifies heavy metals, with leaching rates for lead and zinc significantly below national standards. A 15 % substitution rate of MSWI-FA reduces energy consumption, carbon emissions, and production costs by 14.90 %, 14.63 %, and 4.03 %, respectively, demonstrating notable economic and environmental advantages.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":null,"pages":null},"PeriodicalIF":7.4000,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Assessing the performance and sustainability of ecological mortar with municipal solid waste incineration fly ash solidified by sulphoaluminate cement\",\"authors\":\"\",\"doi\":\"10.1016/j.conbuildmat.2024.138613\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Municipal Solid Waste Incineration Fly Ash (MSWI-FA) contains heavy metals, dioxins, and hazardous substances, making it a hazardous waste. The application of solidification/stabilization (S/S) treatment using chelating agents is widespread due to its high efficiency. However, this treatment is associated with high solidification costs. In this study, an attempt was made to solidify MSWI-FA using sulphoaluminate cement (SAC). Firstly, the effects of varying substitution rates of MSWI-FA on the workability, mechanical properties, durability and heat of hydration of ecological cement mortar (EM) were investigated. Secondly, the microstructure of the EM was investigated in order to ascertain the mechanism of solidification of the MSWI-FA via the SAC. Finally, the economic and environmental benefits of MSWI-FA as an alternative to SAC for the production of EM were evaluated using the material sustainability index. Results show that adding MSWI-FA decreases EM’s workability and mechanical properties, with compressive and flexural strength reductions between 6.87 % and 26.16 % and 5.74–36.74 %, respectively. Durability also declines, evidenced by increased drying shrinkage and chloride migration by 26.79–46.41 % and 11.05–48.19 %, respectively. A slower hydration rate reduces the total heat of hydration by 1.82–7.22 %, indicating lower cement hydration. The porosity and pore size increase, deteriorating the pore structure. However, SAC effectively solidifies heavy metals, with leaching rates for lead and zinc significantly below national standards. A 15 % substitution rate of MSWI-FA reduces energy consumption, carbon emissions, and production costs by 14.90 %, 14.63 %, and 4.03 %, respectively, demonstrating notable economic and environmental advantages.</div></div>\",\"PeriodicalId\":288,\"journal\":{\"name\":\"Construction and Building Materials\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":7.4000,\"publicationDate\":\"2024-10-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Construction and Building Materials\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0950061824037553\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CONSTRUCTION & BUILDING TECHNOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Construction and Building Materials","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0950061824037553","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
Assessing the performance and sustainability of ecological mortar with municipal solid waste incineration fly ash solidified by sulphoaluminate cement
Municipal Solid Waste Incineration Fly Ash (MSWI-FA) contains heavy metals, dioxins, and hazardous substances, making it a hazardous waste. The application of solidification/stabilization (S/S) treatment using chelating agents is widespread due to its high efficiency. However, this treatment is associated with high solidification costs. In this study, an attempt was made to solidify MSWI-FA using sulphoaluminate cement (SAC). Firstly, the effects of varying substitution rates of MSWI-FA on the workability, mechanical properties, durability and heat of hydration of ecological cement mortar (EM) were investigated. Secondly, the microstructure of the EM was investigated in order to ascertain the mechanism of solidification of the MSWI-FA via the SAC. Finally, the economic and environmental benefits of MSWI-FA as an alternative to SAC for the production of EM were evaluated using the material sustainability index. Results show that adding MSWI-FA decreases EM’s workability and mechanical properties, with compressive and flexural strength reductions between 6.87 % and 26.16 % and 5.74–36.74 %, respectively. Durability also declines, evidenced by increased drying shrinkage and chloride migration by 26.79–46.41 % and 11.05–48.19 %, respectively. A slower hydration rate reduces the total heat of hydration by 1.82–7.22 %, indicating lower cement hydration. The porosity and pore size increase, deteriorating the pore structure. However, SAC effectively solidifies heavy metals, with leaching rates for lead and zinc significantly below national standards. A 15 % substitution rate of MSWI-FA reduces energy consumption, carbon emissions, and production costs by 14.90 %, 14.63 %, and 4.03 %, respectively, demonstrating notable economic and environmental advantages.
期刊介绍:
Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged.
Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.