Bond influences several aspects of structural performance. Standard methods of bond test currently specified were developed over 30 years ago. During this rime understanding of the phenomenon of bond between reinforcement and concrete and of the factors which influence it has expanded greatly. An overview of the current knowledge and needs demonstrates that a reappraisal of standard bond tests is now necessary. The paper outlines the principals that should underpin a bond test specification derived from considerations of the manner in which bond influences structural performance. It is demonstrated that a single measure of performance is inadequate, and develops proposals for a system of testing in which several measures can be used to classify each aspect of structural performance. A development length form of test with the bar in tension is selected, with low confinement from concrete cover and transverse reinforcement. The proposal is developed to a conceptual stage in the present paper. Following consultation with interested parties, the Authors propose to develop a detailed specification.
|Number of pages
|Materials and Structures/Materiaux et Constructions
|Published - Oct 2003