激发剂对石膏-矿渣胶凝材料的性能影响研究  

Properties of gypsum-slag cementitious materials modified by alkali-activators

作　　者：赵瑞 高旭 谷倩[1] 范小春[1] 杨婷丽 程大祥 ZHAO Rui;GAO Xu;GU Qian;FAN Xiaochun;YANG Tingli;CHENG Daxiang(Schoolof Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070

出　　处：《混凝土》2023年第10期133-137,共5页Concrete

基　　金：国家自然科学基金青年项目(52108244);武汉理工大学三亚科教创新园开放基金(2020KF0008)。

摘　　要：碱性激发剂的使用是调控石膏-矿渣胶凝材料性能的重要手段,研究了氧化钙、碳酸钠、硫酸钠、水玻璃4种碱性激发剂对两类典型石膏-矿渣胶凝体系力学性能、凝结时间和产物相组成的影响。结果表明:激发剂能缩短石膏矿渣胶凝材料的凝结时间,且在同等掺量下对低水泥体系的影响更显著,水玻璃的促凝效果最佳;在低水泥含量条件下,随激发剂的掺入,水化产物中AFt和C-S-H凝胶增多,力学性能提升,水玻璃激发剂由于可额外提供硅酸根离子,改善效果最显著;在水泥含量较高时,由于水泥提供碱度的能力较强,激发剂的影响相对弱化,碳酸钠作为激发剂时,水化产物中AFt和C-S-H凝胶减少而碳酸钙增多,强度降低。氧化钙的掺入对水化反应有显著的促进作用,但由于生成过量钙矾石导致膨胀,进而导致强度降低。The use of alkaline activators is an important means to control the properties of gypsum-slag cementitious materials.Four types of alkaline activators,namely calcium oxide,sodium carbonate,sodium sulfateand water glass,were studied on the mechanical properties of two typical gypsum-slag cementitious systems,effects of properties,setting time and product phase composition.The results show that the activator can shorten the setting time of the gypsum slag cementitious material,and the effect on the low-cement system is more significant at the same dosage,and the setting acceleration effect of water glass is the best.Under the condition of low cement content,with the activator The addition of AFt and C-S-H gels in the hydration product increases,and the mechanical properties are improved.The water glass activator can provide additional silicate ions,and the improvement effect is the most significant.When the cement content is high,due to the ability of cement to provide alkalinity The effect of the activator is relatively weak.When sodium carbonate is used as the activator,the AFt and C-S-H gels in the hydration product decrease while the calcium carbonate increases,and the strength decreases.Incorporation of calcium oxide significantly promoted the hydration reaction,but resulted in swelling due to excessive ettringite formation,which in turn resulted in a decrease in strength.

关 键 词：石膏 矿渣 碱性激发剂 力学性能 凝结时间 产物相组成 

分 类 号：TU528.042[建筑科学—建筑技术科学]