摘要
目的探究级配对水泥稳定再生集料强度的影响.方法在规范规定的级配上下限范围内均匀的选取5种级配,分别进行水泥稳定再生集料的无侧限抗压强度试验和劈裂强度试验;通过灰色理论分析了级配各组分与强度的关联性,并拟合得到各级配分形维数与强度之间关系式.结果级配对无侧限抗压强度、劈裂强度影响明显,且随级配由上限到下限的变化强度呈现先增大后降低的趋势,并在中上级配时达到最大.通过灰色关联度分析发现4.75～9.5 mm粒径组和强度的关联性最大,大于4.75 mm的粒径与无侧限抗压强度关联性更好,而小于4.75 mm粒径与劈裂强度关联性更好.拟合得到级配分形维数与强度之间二次多项关系式.结论再生集料的最佳级配对应的分形维数为2.491 4,所得结果可为水泥稳定再生集料的级配设计提供参考.
In order to explore the effect of gradation on cement stabilized recycled aggregate,five gradations were evenly selected during the upper and lower limits of gradation that ruled in the specification and then unconfined compressive strength test and splitting strength test were carried out respectively.The test results show that the strength of the unconfined compressive strength and the splitting strength are obviously affected by the gradation,and the strength increases first and then decreases with the gradation from the upper limit to the lower limit.Through grey correlation analysis,it is found that the correlation between 4.75~9.5 mm particle size and strength is the largest.The correlation of particle size greater than 4.75 mm and unconfined compression strength is better,while less than 4.75 mm particle size is better associated with splitting strength.The relationship between gradation fractal dimension and strength is obtained by fitting.The best fractal dimension is determined to be 2.491 4,and the best gradation is obtained by backstepping,which provides a reference for gradation design of cement stabilized recycled aggregate.
作者
雷俊安
郑南翔
纪小平
杨俊
LEI Jun′an;ZHENG Nanxiang;JI Xiaoping;YANG Jun(Key Laboratory for Special Area Highway Engineering of Ministry of Education,Chang'an University,Xi'an,China,710064;School of Civil Engineering and Architecture,China Three Gorges University,Yichang,China,443002)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第2期315-323,共9页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51408044)
住房和城乡建设部科学技术资助项目(2015-k4-13)
关键词
级配
再生集料
无侧限抗压强度
劈裂强度
灰色关联
分形维数
gradation
recycled aggregate
unconfined compressive strength
splitting strength
grey correlation
fractal dimension
