化学外加剂对固废基胶凝材料性能及水化行为的影响  

Effects of chemical admixtures on properties and hydration behaviors of solid waste based cementitious materials

作　　者：孙雅娟 段思宇 张宏 周冬冬 路广军 马志斌 SUN Yajuan;DUAN Siyu;ZHANG Hong;ZHOU Dongdong;LU Guangjun;MA Zhibin(Institute of Resources and Environmental Engineering,Shanxi University,Taiyuan 030006,Shanxi,China;Shanxi Road and Bridge Renewable Resources Development Co.,Ltd.,Taiyuan 030032,Shanxi,China)

机构地区：[1]山西大学资源与环境工程研究所,山西太原030006 [2]山西路桥再生资源开发有限公司,山西太原030032

出　　处：《化工进展》2025年第3期1739-1748,共10页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(22078181);中央引导地方科技发展资金(YDZJSX20231A007);山西省重点研发计划(202202090301021);山西省基础研究计划(202103021223268)。

摘　　要：以煤气化渣、循环流化床粉煤灰和水泥为原料,制备了固废基复合胶凝材料。分别选取氢氧化钠(NaOH)、硫酸钠(Na_(2)SO_(4))和碳酸钠(Na_(2)CO_(3))作为化学外加剂,研究了单一外加剂和NaOH-Na_(2)SO_(4)复合外加剂在不同掺量下对复合胶凝材料抗压强度、流动度、凝结时间和收缩行为的影响;利用等温量热、X射线衍射(XRD)、同步热分析(TG)和扫描电子显微镜(SEM)分析了其水化机理。结果表明:3种化学外加剂的掺杂均可缩短复合胶凝体系的凝结时间,并使体系的流动度有所降低。NaOH和Na_(2)CO_(3)的适量掺杂可显著提高复合胶凝体系的早期强度,Na_(2)SO_(4)的掺杂可明显提高体系的28d和90d强度,NaOH-Na_(2)SO_(4)复合外加剂的加入可使不同龄期的强度均有所提高。化学外加剂的掺入可缩短体系的水化诱导期,提高水化反应速率,生成更多钙矾石和C-(A)-S-H凝胶等水化产物,使得基质更为致密,进而提升力学强度。本文研究结果可为固废基复合胶凝材料的性能调控提供理论支撑。In this study,solid waste based composite cementitious materials were prepared using coal gasification slag,circulating fluidized bed fly ash and cement.Sodium hydroxide(NaOH),sodium sulfate(Na_(2)SO_(4))and sodium carbonate(Na_(2)CO_(3))were selected as chemical admixtures.The effects of single admixture and the NaOH-Na_(2)SO_(4)mixed admixture on the compressive strength,fluidity,setting time and shrinkage of composite cementitious materials were investigated.The hydration mechanism was analyzed using isothermal calorimetry,X-ray diffraction(XRD),simultaneous thermal analysis(TG-DTG)and scanning electron microscopy(SEM).Results showed that the incorporation of all three chemical admixtures could shorten the setting time of the composite cementitious system and reduce the fluidity of the system.The moderate addition of NaOH and the Na_(2)CO_(3)could significantly improve the early strength of the composite cementitious system,the addition of Na_(2)SO_(4)could significantly improve the 28d and 90d strength of the system,and the addition of NaOH-Na_(2)SO_(4)composite admixture could improve the strength of different ages.

关 键 词：煤气化渣 循环流化床粉煤灰 复合胶凝材料 化学外加剂 综合性能 水化机理 

分 类 号：TU501[建筑科学—建筑技术科学]