摘要
建立了基于地面与基层间摩阻力的早龄期自流平水泥砂浆地面收缩应力的解析计算方法,给出了地面最大收缩应力的解析表达式.采用松弛系数法对水泥砂浆徐变对地面收缩应力的影响做了修正.通过模型计算,分析了水泥砂浆收缩应变、徐变,地面厚度、长度对地面收缩应力的影响.计算结果表明,自流平水泥砂浆收缩应变是控制地面收缩应力的主要因素,降低水泥砂浆的收缩可以显著减小地面的收缩应力.模型预测结果与现场试验结果吻合良好.
An analytical model for prediction of shrinkage-induced stresses in self-leveling cement mortar flooring due to the restraint of supporting base is proposed. The influence of creep on shrinkage stresses is taken into account by relaxation coefficient method. Using the model, the effect of shrinkage strain, creep of cement mortar, thickness and length of the floor layer are analyzed by using three typical self-leveling mortars with greatly different shrinkage-time performance. The calculation results show that the developed low shrinkage self-leveling mortar can greatly decrease shrinkage stresses. A good agreement between model prediction and field slab test on cracking behavior of the mortar layer is found.
出处
《建筑材料学报》
EI
CAS
CSCD
2008年第4期379-385,共7页
Journal of Building Materials
关键词
自流平水泥砂浆
收缩应力
开裂
模型
self-leveling mortar
shrinkage stress
cracking
model
