Repair of Concrete Structures with SCC

Authors: F. Kharchi, M. Benhadji, O. Bouksani

Abstract:

The objective of this work is to study the influence of the properties of the substrate on the retrofit (thin repair) of damaged concrete elements, with the SCC. Fluidity, principal characteristic of the SCC, would enable it to cover and adhere to the concrete to be repaired. Two aspects of repair are considered, the bond (Adhesion) and the tensile strength and the cracking. The investigation is experimental; It was conducted over test specimens made up of ordinary concrete prepared and hardened in advance (the material to be repaired) over which a self compacting concrete layer is cast. Three alternatives of SC concrete and one ordinary concrete (comparison) were tested. It appears that the self-compacting concrete constitutes a good material for repairing. It follows perfectly the surfaces- forms to be repaired and allows a perfect bond. Fracture tests made on specimens of self-compacting concrete show a brittle behaviour. However when a small percentage of fibres is added, the resistance to cracking is very much improve.

Keywords: Adhesion, concrete, experimental, repair, self-compacting.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1058227

References:

[1] Benhadji M "Etude du comportement d-une poutre réparée par reprofilage- application du béton autopla├ºant". Magister USTHB génie civil, (2008).
[2] Kharchi F. Abib Z. Gaher H., "Béton autopla├ºant-optimisation de la composition". 1er congrès international sur la technologie et la durabilité du Béton-USTHB, 2004
[3] Kharchi F. Abib Z. Gaher H , "Self compacting concrete with Algerian component".First international conference of civil engineering science Assiut EGYPTE, 2003
[4] Bonaldo E, Lourenço P B, Barros .J A O "Bond characterisation between concrete substrate and repairing", SFRC using pull-off testing. International journal of adhesion and adhesives", 2005, pp. 463-474
[5] Courard L and Bissonette B), "Essai dérivé de l-essai d-adhérence pour la caractérisation de la cohésion superficielle"., Materials and Structures vol.37, 2004, pp. 342-350.