摘要
为探究传统碱–碳酸盐反应(ACR)机理和碱活性碳酸盐骨料在地质聚合物中的反应行为,对比研究了含纯白云石(YT)和含加拿大Kingston白云质灰岩(CK)地质聚合物砂浆分别在不同养护条件[室温相对湿度(RH)大于95%、38℃时RH>95%和80℃时1mol/L NaOH溶液]下的变形行为。结果显示:YT在3种养护条件地质聚合物中仅起填料作用而使砂浆收缩略有减小;含CK地质聚合物砂浆随温度和/或碱度变化呈现显著不同的变形行为,特别是在38℃、RH>95%和80℃、1 mol/L NaOH溶液条件下分别于不同养护阶段产生微小膨胀;预示CK在地质聚合物体系中的反应机制可能与硅酸盐水泥体系中的显著不同,通过选择特定的碳酸盐骨料和养护条件,可望实现地质聚合物体系变形的调控。
For understanding the alkali-carbonate reactivity in geopolymer and the mechanism of traditional alkali-carbonate reaction （ACR）, the deformation behavior of geopolymer mortar with pure dolomite （YT） and dolomitic limestone from Kingston, Canada （CK） was studied by curing at different conditions, i.e. room tenaperature with over 95% relative humidity （RH）, 38 ℃ RH 〉 95% and 80 ℃ 1 mol/L NaOH. Results show that, at the three curing conditions, YT only acts as a filler to slightly reduce the shrinkage of the mortar; The deformation behavior of geopolymer mortar with CK varies remarkably with the changes in the curing temperature and alkalinity, especially the mortars with CK expand slightly at different curing stages when cured at 38 ℃ RH〉95% and 80 ℃ 1 mol/L NaOH; it suggests that the reaction mechanism of CK in geopolymer may be quite different with that in cement system, and the shrinkage of geopolymer might be compensated by selecting special carbonate aggregate and curing conditions.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2012年第7期1067-1070,共4页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(51072080)
教育部科学技术研究重点(210079)资助项目
江苏高校优势学科建设资助项目
关键词
地质聚合物
碱–碳酸盐反应
变形行为
膨胀
收缩补偿
geopolymer
alkali-carbonate reaction
deformation behavior
expansion
shrinkage compensation
