Interpretation and application of core test data in strength evaluation of existing concrete bridge structures

Abstract

Compressive strength tests on concrete cores taken from existing bridge structures are often used as a tool in evaluating the strength of the existing structure. Some difficulties are, however, encountered in interpreting the result of these tests and incorporating appropriate values in the usual equations for determining strength of structural members. In this paper, relationships between core tests, cylinder tests, and in situ strength are reviewed based on data reported in the literature. Methods for incorporating core test data into a limit states design approach for strength evaluation are investigated. A method is proposed to convert data from compressive strength tests on cores into an equivalent design compressive strength that can be used in the normal design equations for strength. The method is applied to the analysis of an existing bridge for which core test data are available. Key words: concrete cores, reinforced concrete, bridges, tests, compressive strength, structural evaluation.