南京理工大学学报（自然科学版）2024，Vol.48Issue(1)：45-52,8.DOI:10.14177/j.cnki.32-1397n.2024.48.01.004
不同粗骨料粒径混凝土动态压缩强度的离散性研究
Study on the discreteness of dynamic compressive strength of concrete with different coarse aggregate particle size
摘要
Abstract
In order to study the discreteness problem of dynamic compression test caused by the difference of coarse aggregate particle size,concrete and mortar specimens with the largest particle size of 8 mm,14 mm and 26 mm are prepared,and the stress-strain curves and strain rate-dynamic increase factor(DIF)curves of each sample under different strain rates are obtained through dynamic and static compression tests.In order to more intuitively analyze the problem of test discreteness caused by the difference in coarse aggregate particle size,the particle size coefficient λ is defined as the ratio of the maximum particle size of the coarse aggregate d to the diameter of the specimen D,and the coefficient of variation CV is introduced.Using mathematical statistical methods to quantify the discreteness,obtain the relationship between λ and CV,and intuitively reflect the relationship between the discreteness and the coarse aggregate particle size.The analysis shows that,λ=0.34 is the critial point of concrete material heterogeneity.When the particle size coefficient λ<0.34,the effect of concrete material heterogeneity is not obvious.When λ>0.34,the excessively large coarse aggregate particle size has affected the dynamic response of concrete,and the material heterogeneity is obviously enhanced.This conclusion has guiding significance for the selection of coarse aggregate particle size in future engineering and experiments.关键词
离散性/粒径系数/动态增长因子/混凝土/分离式霍普金森压杆Key words
discreteness/particle size coefficient/dynamic increase factor/concrete/split Hopkinson pressure bar分类
数理科学引用本文复制引用
丁俊升,王江波,高光发,杜忠华,董雪花..不同粗骨料粒径混凝土动态压缩强度的离散性研究[J].南京理工大学学报（自然科学版）,2024,48(1):45-52,8.基金项目
国家自然科学基金(11772160 （）
11472008 （）
11802141) （）
冲击与安全工程教育部重点实验室开放基金(CJ202006) （CJ202006）
