碱激发粉煤灰矿渣胶凝材料的流变性能
Rheological Properties of Alkali Activated Fly Ash Slag Cementitious Materials
李莎莎 1李刘蓓 1吴伟 2冯虎3
作者信息
- 1. 郑州经贸学院土木建筑学院,河南郑州 450003
- 2. 黄河水利职业技术学院,小流域水利河南省高校工程技术研究中心,河南 开封 475004
- 3. 郑州大学,河南 郑州 450001
- 折叠
摘要
这是一篇陶瓷及复合材料领域的论文.为了研究碱激发粉煤灰矿渣胶凝体系在早期的流变特性,制备了不同粉煤灰和矿粉质量比以及碱激发剂含量的复合浆体,并且分别采用了微型坍落度筒和Brookfield DV3T流变仪测试其流动性和流变性,最后用等温量热仪测试了各组配比下浆体的水化放热速率.结果表明:当FA/GGBS比为3∶7时,碱激发剂NaOH含量为4％的浆体在所有配合比中流动度为较低.随着粉煤灰质量比和NaOH摩尔质量的升高,碱激发粉煤灰矿渣胶凝体系的流动度均有所上升,且屈服应力和塑性黏度有所下降.粉煤灰掺量的升高使得早期水化速率有所下降,而碱激发剂含量的增加则提高了水化放热峰值速率.
Abstract
This is an article in the field of ceramics and composites.In order to study the early rheological properties of alkali-activated fly ash-slag cementitious system,the composite pastes with different mass ratios of fly ash(FA)to slag(GGBS)and alkaline activator content were prepared.The fluidity and rheological properties of the pastes were tested by mini-cone slump cone,Brookfield DV3T rheometer,respectively.Finally,the hydration exothermic rate of composite pastes with each ratio was tested by isothermal calorimeter.Results show that when FA/GGBS ratio is 3∶7,the fluidity of paste with 4％NaOH content is the lowest.With the increase of FA mass ratio and NaOH molar mass,the fluidity of alkali-activated FA-GGBS cementitious system increased,and the yield stress and plastic viscosity decreased.The growth of FA content decreases the early hydration rate significantly,while the increase of alkali activator content remarkably increases the peak rate of hydration heat release.
关键词
陶瓷及复合材料/碱激发粉煤灰矿渣胶凝材料/流动度/流变性能/触变性/水化放热速率Key words
Ceramics and composites/Alkali-activated fly ash-slag cementitious materials/Fluidity/Rheological properties/Thixotropy/Hydration heat release rate引用本文复制引用
基金项目
国家自然科学基金(51709125)
西藏自治区科技厅重点研发项目(XZ201901-GB-15)
出版年
2024
国家科技期刊平台
NSTL
万方数据