钻芯法检测混凝土强度芯样尺寸效应的研究

Research on size effect of core samples for testing concrete strength with drilled core method

针对不同直径不同高径比芯样推定混凝土强度问题，选取了本地区常用的原材料，制作了C20～C55八个强度等级2500mm×200mm×1650mm的试件，钻取直径为50、70、100mm，得到了1368个高径比为0．5、O．7、1．0的芯样。利用回归分析方法，得到了不同直径不同高径比芯样的回归方程，给出了不同直径不同高径比芯样的折算系数，同时，运用方差分析方法，得到了直径、高径比对芯样尺寸效应的影响程度，为小芯样测强在本地区的推广奠定了基础。

According to different diameters and height-diameter ratios core samples predicting concrete strength, using the typical raw materials of local area,the simples of C20-C55 of eight 2 500 mm×200 mm×1650 mm samples are made.The values of 1368 core samples compressive strength are obtained, which are the samples of 50,70,100 mm diameter and 0.5,0.7,1.0 height-diameter ratios.Using the re- gression analysis to obtain core samples of different diameters and height-diameter ratio regression equation, and gives correction coeffi- cients.meanwhile, through variance analysis method, the influence degree of diameter and height-diameter ratio are given.This study laid a foundation for small core samples measured in the region to apply.