ABSTRACT
The chapter deals with surface hardness methods for nondestructive testing of concrete. These methods consist of the indentation type and those based on the rebound principle. The rebound method is described in detail, and a procedure is given for the preparation of correlation curves between compressive strength and rebound number. The advantages and limitations of the surface hardness methods are discussed. it is concluded that these methods must be regarded as substitutes for standard compression tests, but as a means for determining the uniformity of concrete in a structure and comparing one concrete against another.
