环境温度下蔗糖类缓凝剂对浆体性能的影响  

Influence of sucrose retarder on properties of cement mortar at different ambient temperatures

作　　者：温小栋[1] 马保国[2] 许永和[3] 潘伟[3] 

机构地区：[1]宁波工程学院宁波市混凝土结构耐久性重点实验室,浙江宁波315016 [2]武汉理工大学硅酸盐材料工程教育部重点实验室,湖北武汉430070 [3]同济大学先进土木工程材料教育部重点实验室,上海200092

出　　处：《江苏大学学报（自然科学版）》2009年第2期205-208,共4页Journal of Jiangsu University：Natural Science Edition

基　　金：国家"863"计划项目(2005AA332010)

摘　　要：针对环境温度对缓凝剂作用的影响,采用自动高效水化热测定仪及无电极电阻率测试仪,在线测试不同温度下,新拌水泥净浆的凝结时间、水化历程及电阻率变化.通过原子吸收及XRD进行机理分析,获得蔗糖类缓凝剂在环境温度下的适应性及其作用机制,为解决实际工程问题提供理论基础.试验结果表明,蔗糖凝结时间的临界值随着环境温度的升高而降低,但在一定掺量下,蔗糖在高温下缓凝效果比低温下强;对于一定掺量的蔗糖,高温更能延缓水化放热峰的出现及浆体结构的形成.To study the effect of ambient temperature on the retarder,the setting time,hydration process and resistivity variation of the fresh paste were on-line tested at different temperatures by using heat of hydration measuring device,non-contacting electrical resistance measuring device and so on.Its temperature adaptability and action mechanism were discussed by means of the atomic absorption and XRD.Results of experiments show that there is a critical amount of sucrose which decrease with the increasing of the ambient temperature.At certain dosage,its effect on the setting retarding,temperature peak of hydration prolonging and structure formation slowing down is better at higher temperatures than at lower temperatures.

关 键 词：蔗糖 缓凝剂 浆体结构 环境温度 临界值 

分 类 号：TU528[建筑科学—建筑技术科学]