Evaluation on Horizontal Construction Joint of Dam Concrete by Cylinder Flexural Strength Test

Abstract

Horizontal construction joint between new and old dam-concrete is likely to be a structural defect that endangers security and water tightness of the dam body. In this study, simple flexural strength tests by cylinder specimen that commonly used to compressive strength tests are executed to find the factors playing into the horizontal construction joint such as green cutting and curing methods for old concrete and properties of bedding mortar. Results show that the flexural strength of horizontal construction joint after long-term interruption is lower compare to the immediate placing case.