本文件规定了使用弹簧锤测定硬化混凝土区域回弹数的方法。 注1:通过该方法确定的回弹数可用于评估现场混凝土的均匀性，以划定结构中质量差或劣化混凝土的区域。 注2:本试验方法不作为混凝土抗压强度测定的替代方法（EN 12390-3），但通过适当的相关性，它可以提供现场抗压强度的估计值。关于现场抗压强度的评估，见EN 13791。 注3:锤子可用于对比试验，参照已知强度的混凝土或已证明其来自规定体积的混凝土，并验证总体符合特定强度等级的混凝土。

This document specifies a method for determining the rebound number of an area of hardened concrete using a spring-driven hammer. NOTE 1 The rebound number determined by this method can be used to assess the uniformity of concrete in situ, to delineate zones or areas of poor quality or deteriorated concrete in structures. NOTE 2 The test method is not intended as an alternative for the compressive strength determination of concrete (EN 12390-3), but with suitable correlation, it can provide an estimate of in situ compressive strength. For the assessment of in situ compressive strength, see EN 13791. NOTE 3 The hammer can be used for comparative testing, referenced against a concrete with known strength or against a concrete which has been shown that it has come from a defined volume of concrete with a population verified as conforming to a particular strength class.