摘要
在同济大学再生混凝土材料与结构研究组完成的大量再生混凝土静载抗压强度试验基础上,对再生混凝土静载抗压强度分布特征进行统计分析,得出再生混凝土的静载抗压强度可以用正态分布模型来描述;研究了不同粗骨料取代率情况下再生混凝土轴心静载抗压强度均值和方差的变化规律,对统计参数采用皮尔逊χ2拟合优度检验法进行了检验;基于文献研究的成果,推导出了再生混凝土疲劳寿命概率分布表达式和疲劳强度表达式,对比分析了不同粗骨料取代率、不同应力比情况下再生混凝土的疲劳强度变化规律。结果表明:随着再生粗骨料取代率的增加,再生混凝土的疲劳强度呈现出降低趋势;根据推导的表达式可以估算不同疲劳寿命、不同保证率下的再生混凝土轴心抗压疲劳强度,为再生混凝土路面设计提供了依据。
Based on the test results of a large number of recycled aggregate concrete（RAC） static compressive strength completed by the Recycled Concrete Materials and Structures Research Group of Tongji University,the distribution characteristic for the static compressive strength of recycled aggregate concrete was studied and the probability distribution of the fatigue life and the expression of compressive fatigue strength were proposed.The results of Pearson χ2 goodness of fitting show that the normal distribution model can be used to describe the probability distribution characteristics of the static compressive strength of RAC.Finally,the comparative analyses for fatigue strength of RAC under different stress ratios were made by the fatigue formula considered the influence about the mean and variance of axial compressive strength caused by different replacement percentages of the recycled coarse aggregate.The results show that with the increase of recycled coarse aggregate replacement percentage,the fatigue strength of recycled concrete shows a decreasing trend.According to this approach,axial compression fatigue strength with different fatigue lives and guaranteed rates can be estimated,which provide the basis for recycled concrete pavement design.
出处
《建筑科学与工程学报》
CAS
2010年第4期7-13,共7页
Journal of Architecture and Civil Engineering
基金
"十一五"国家科技支撑计划项目(2008BAK48B03)
教育部新世纪优秀人才支持计划项目(NCET-06-0383)
关键词
再生混凝土
抗压强度
疲劳强度
正态分布
取代率
应力比
recycled aggregate concrete
compressive strength
fatigue strength
normal distribution
replacement percentage
stress ratio
