深圳大学学报（理工版）2025，Vol.42Issue(1)：1-9,9.DOI:10.3724/SP.J.1249.2025.01001
复合促凝剂对CFBFA基泡沫混凝土性能的影响
Effect of hybrid accelerator on the property of CFBFA-based foamed concrete
摘要
Abstract
Circulating fluidized bed fly ash(CFBFA)is a major by-product of modern coal combustion technologies.Foamed concrete with a high CFBFA content can meet insulation requirements for building partition walls.However,a high CFBFA content slows the setting process of foamed concrete,reducing turnover efficiency in industrial production.A hybrid accelerator was developed using a mixture of aluminum sulfate and calcium hydroxide.With the mass fraction of aluminum sulfate fixed at 3%,the effects of varying mass ratio of calcium hydroxide to aluminum sulfate 0,0.25,0.50,0.75 and 1.00,respectively,on the setting time,compressive strength,and thermal conductivity of CFBFA-based foamed concrete were investigated.The effects of hybrid accelerator on the early hydration of CFBFA-based foamed concrete were studied by X-ray diffraction,thermogravimetric analysis,scanning electron microscopy and isothermal conductivity calorimetry.The pore structure was analyzed using a 3D profiler combined with Image-Pro.The results showed that when the mass ratio of calcium hydroxide to aluminum sulfate in the hybrid accelerator was 0.25,the initial setting time of CFBFA-based foamed concrete was reduced by 220 min compared to the control group without calcium hydroxide.When the mass ratio of calcium hydroxide to aluminum sulfate in the hybrid accelerator was 0.75,the 3 d strength of CFBFA-based foamed concrete reached 10.39 MPa,with a thermal conductivity of 0.30 W·m-1·K-1.The hybrid accelerator promoted the generation of needle-like ettringite(AFt)during early hydration,making the CFBFA-based foamed concrete more compact and the pore size distribution more uniform.The hybrid accelerator enables efficient mass production of CFBFA-based foamed concrete and shows promising prospects for engineering applications.关键词
泡沫混凝土/复合促凝剂/循环流化床固硫灰/隔热/孔隙结构/早期强度/钙矾石Key words
foamed concrete/hybrid accelerator/circulating fluidized bed fly ash/heat insulation/pore structure/early strength/ettringite分类
土木建筑引用本文复制引用
董必钦,张枭,刘源涛,王琰帅..复合促凝剂对CFBFA基泡沫混凝土性能的影响[J].深圳大学学报（理工版）,2025,42(1):1-9,9.基金项目
National Key R&D Program of the Ministry of Science and Technology in the 14th Five-Year Plan(2022YFB2602600) （2022YFB2602600）
National Natural Science Foundation of China-Railway Basic Research Joint Fund(U2368209) （U2368209）
Guangdong-Hong Kong Science and Technology Cooperation Project of the Department of Science and Technology of Guangdong Province(2023A0505010020). 十四五国家科技部重点研发计划资助项目(2022YFB2602600) （2023A0505010020）
国家自然科学基金-铁路基础研究联合基金资助项目(U2368209) （U2368209）
广东省科技厅粤港科技合作资助项目(2023A0505010020) （2023A0505010020）
