化学活化方法对磨细火山岩弃渣-水泥复合胶凝体系的影响  

Effect of Chemical Activation Methods on Volcanic Slag-Cement Composite Binder

作　　者：谭盐宾 李林香 杨珍珍 邢梓达 林炘恺 葛昕 杨鲁 元强[3] TAN Yanbin;LI Linxiang;YANG Zhenzhen;XING Zida;LIN Xinkai;GE Xin;YANG Lu;YUAN Qiang(China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;National Key Laboratory of High-speed Railway Track System,Beijing 100081,China;School of Civil Engineering,Central South University,Changsha 410083,China;Dundee International Institute,Central South University,Changsha 410083,China)

机构地区：[1]中国铁道科学研究院集团有限公司,北京100081 [2]高速铁路轨道系统全国重点实验室,北京100081 [3]中南大学土木工程学院,长沙410083 [4]中南大学邓迪国际学院,长沙410083

出　　处：《材料导报》2024年第22期71-77,共7页Materials Reports

基　　金：中国铁道科学研究院集团有限公司国家创新平台开放基金(2022YJ133);科技部国家重点研发计划(2022YFB2602604)。

摘　　要：化学活化方法能够改善天然磨细火山岩弃渣作为矿物掺合料的工程适用性。采用强度活性指数法,对比了多种化学激发剂的活化效果,分析了化学激发剂类别及掺量对磨细火山岩弃渣-水泥复合胶凝体系的浆体凝结时间、流变性能以及孔结构的影响,并基于热重分析探索其影响机理。结果表明:化学激发剂对强度的提升效果更多地反映在中后期强度,Li_(2)SO_(4)、Na_(2)SO_(4)和三乙醇胺(TEA)对磨细火山岩弃渣活性的提升效果最佳,最高可达18%。化学激发剂会加速浆体凝结,还会增大新拌浆体的塑性黏度。化学激发剂可以降低复合胶凝体系的孔隙率,并可优化孔径分布,且对水泥的水化产物种类没有影响。The utilization of chemical activation method can enhance the applicability of natural volcanicash produced by waste slags as mineral admixtures in engineering applications.By employing the strength activity index method,a comparative analysis was conducted on the effects of various chemical activators on activation,and the impacts of activator type and dosage on setting time,rheological properties,and pore structure of pulverized pozzolan-cement composite binder were investigated.Results indicate that chemical activators have a more pronounced influence on strength enhancement during intermediate to late ages,with Li_(2)SO_(4),Na_(2)SO_(4),and TEA exhibiting superior performance in activating natural volcanic slags up to 18%.Chemical activators accelerate slurry setting while increasing plastic viscosity for newly mixed slurries.They also reduce porosity within composite binder while refining pores size distribution without affecting hydration product types.

关 键 词：天然磨细火山岩弃渣 化学活化 激发剂 复合胶凝体系 

分 类 号：TU528[建筑科学—建筑技术科学]