高强轻骨料混凝土收缩徐变模型对比分析

Model of shrinkage and creep of high strength light weight aggregate concrete

总结了我国轻骨料混凝土技术规程模型、MC2010模型、ACI209模型、B3模型的适用范围和基本公式,计算分析了上述模型对高强轻骨料混凝土收缩徐变的预测效果,结果表明上述模型对高强轻骨料混凝土的基本徐变预测精度较高,但对高强轻骨料混凝土的收缩预测与实验数据存在一定差距.本文在对比分析的基础上,基于已有文献数据,提出了考虑骨料含水率影响的MC2010修正模型.通过与试验数据对比表明,修正模型对高强轻骨料混凝土收缩变形的预测精度更好.

This paper summarized the applicable scope and formulas of Chinese specification model,MC2010 model,ACI209 model,and B3 model,and compared the predication accuracy for creep and shrinkage of high strength lightweight aggregate concrete. The prediction models got good results for basic creep,but not good for shrinkage. After analysis of parameters,experimental data in literature were employed to build a modified MC2010 model which considered the influences of water content in aggregate.Comparisons between the predicted results and published data indicate that the modified model has better precision for shrinkage of high strength lightweight aggregate concrete.