Micromechanical study of the interface properties of concrete repair systems

Author(s): M. Luković, G. Ye
Paper category: Proceedings
Book title: Proceedings of the Seventh International Conference on Concrete under Severe Conditions – Environment and Loading
Editor(s): Z.J. Li, W. Sun, C.W. Miao, K.Sakai, O.E. Gjørv, N.Banthia
ISBN: 978-2-35158-124-7
e-ISBN: 978-2-35158-134-6
Publisher: RILEM Publications SARL
Publication year: 2013
Pages: 773-786
Total Pages: 14
Language : English

Abstract: Micromechanical interface properties in a repair system determine the performance and reliability of a repaired structure. In order to characterize these properties, nano indentation technique was applied. The indented areas were imaged in ESEM for the location of the indents and distance from the substrate. Location of the indents was correlated with mechanical data to show the propagation of the weak zone around the contact of two materials. Hardness and elastic modulus values obtained from the nano indentation were used directly as the input for simulated direct tension test. This way, the structural behavior of original microstructure, “mimicked” by Delft lattice model, is analyzed. Simulation results enable prediction and better insight into fracture propagation and micromechanical response of the tested zone. They also indicate the ratio between interface and bulk material fracture properties. Load displacement diagrams of interface, old and new material can serve as an input for further numerical modelling and understanding of fracture behavior of the repair systems at the higher scale. Potentially, this approach may develop as a tool for verifying and engineering interface properties such that desired performance of the repaired structure is achieved.

Online publication : 2013
Publication type : full_text
Public price (Euros) : 0.00