一、前言目前测定混凝土强度的非破损方法,最常用的是回弹法和超声波法。这两种方法是分别借助于表面硬度和密度等对强度并不敏感的间接物理量来测定混凝土强度。拔出法(因测定部位有局部损伤,故又称局部破损法)是通过锚固件的抗拔力测定混凝土强度。这个抗拔力是由混凝土的抗 I. INTRODUCTION The non-destructive methods for measuring concrete strength at present are the most commonly used rebound method and ultrasonic method. Both methods measure the concrete strength by means of indirect physical quantities that are not sensitive to the strength such as surface hardness and density. Pull-out method (local damage due to measurement site, it is also called local damage method) is to determine the strength of concrete through the pull-out force of the anchor. This pullout resistance is made of concrete