Method to investigate bond behavior and moisture ingress in concrete
Date
2020
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Publisher
University of Delaware
Abstract
The knowledge on the joint connections and the bonding of concrete has evolved over the years. With the complexity in the bonding of materials, we must use a test method that properly represents the impact of the different parameters in the bond. The 4-point bending test has several traits which makes it optimal for testing bond behavior, however it has not been used throughout the history of bond testing. Tests such as slant shear test, split tensile test carry flaws and leave much to be desired. In order to validate the use of the flexural test in investigating bond behavior, a series of 4-point bending tests were conducted. We used the results from these tests and our knowledge on the bond to see how well the bond parameter is represented within the data. In particular, we investigated some key parameters in the bonding of concrete in bridge applications. We took a more in depth look into how the surface roughness of the interface affects the bond. We looked into the role the moisture state of the concrete plays into the bonding. We observed how the data compares with the knowledge we have of these different components to see how well it is reflected through the tests. Absorption tests were conducted on the concrete in order to better understand and predict the effect of moisture content on the bond behavior. The purpose of this research is to provide a straightforward method in studying bond behavior between concrete in bridge joint connection. ☐ Keywords: Bond Behavior, Flexural Test, 4-Point Bending, Precast Concrete, Moisture State, Surface Roughness
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Keywords
4-point bending, Bond behavior, Flexural test, Moisture state, Precast concrete, Surface roughness