基于孔溶液性质的减缩剂减缩机理研究.pdfVIP

第14卷第1期 建 筑 材 料 学 报 Vol_14，No．1 学兔兔 2011年2月 J0URNAI 0F BUILDING MATERIALS Feb．。2O11 文章编号：1007—9629(2011)01—0001—05 基于孑L溶液性质的减缩剂减缩机理研究 姚 燕， 吴 浩， 王 g- (中国建筑材料科学研究总院绿色建筑材料国家重点试验室，北京 1O0O24) 摘要：在进行减缩剂减缩机理的研究中，以Laplace方程为理论依据，分析了温度、碱度对减缩剂降 低孔溶液表面张力的影响，评价了掺减缩剂孔溶液与水泥石毛细孔壁的接触性质，并对以7cos 0 表征的减缩机理有效性进行了评价．结果表明：温度和碱度的提高增强了减缩剂降低溶液表面张 力的能力；减缩剂将孔溶液与水泥石的接触性质由润湿转变为半润湿状态；建立的以7cos 0表征 的减缩机理能较准确地预测水泥石收缩的发展趋势． 关键词：减缩机理；减缩剂；表面张力；接触性质 中图分类号：TU502 文献标志码：A doi：10．3969／j．issn．1007—9629．2O11．01．001 Research on Action Mechanism of Shrinkage Reducing Agent Based on Pore Solution Property YA0 Yan， WU Hao， WANG Ling (State Key Laboratory of Green Building Materials，China Building Materials Academy，Beijing 100024，China) Abstract：The influence of temperature and alkalinity on shrinkage reducing performance of shrinkage re— ducing agent(SRA)was investigated based on the Laplace equation．The contacting property between pore solution and capillary pore wall of cement paste was studied and the action mechanism of shrinkage reduc— tion based on 7cos 0 was analyzed．According to the experiment results，the reduction ability of SRA to re— duce surface tension is enhanced by the increase in temperature and alkalinity；the wet condition of pore solution in cement paste is changed by SRA；the shrinkage development trend of cement paste can be accu— rately predicted by the shrinkage reducing mechanism based on contacting property and surface tension． Key words：shrinkage reducing mechanism；shrinkage reducing agent；surface tension；contacting property 减缩剂