Elaboration d’un béton autoplaçant pour le renforcement et la réparation des ouvrages en béton arme.

Abstract

To develop methodologies to improve the quality of repairs, which leads to durable repair, it is necessary all components of repaired system must be considered. The choice of repair material must be compatible with the concrete to be repaired, in particular, the dimensional compatibility criteria are essential to avoid deboning of the repair layer on the one hand and on the other hand the quality of adhesion between the repair material and its support (substrate). Taking into account that the main pathologies of cement-based adherent repairs result from cracking due to dimensional variations. Also, the roughness and wetness of the surface of the substrates significantly affect the adhesion with the repair. To answer the objective of this study, a simulation by the repair technique applied to an ordinary concrete substrate (BO) and using as repair material three types of concretes: two self-compacting concretes of different resistance (30 and 40MPa), namely (BAP30) and (BAP40), and a vibrated concrete (BOV) of resistance (30Mpa) is taken as reference concrete. The bond evaluation test is based on the splitting tensile test protocol (indirect tensile). To determine the adhesion and bond quality, as well as the mode of rupture for each composite (Repair/Substrate). Overall, the results obtained show that, .the fabricated self-compacting (BAPs) give advantages for use as repair materials. The use of self-compacting (BAP) improves the performance of the repaired system. Excellent adhesion quality obtained by (BAP40) and (BAP30), compared to ordinary vibrated concrete (BOV). Repair by (BAP30) and (BAP40) developed an adaptation capacity by shrinkage favorable to the repaired system. The (BAP30) presents dimensional variations nearest and the (BAP40) slightly less to those of (BO), and Therefore Adequate deformational compatibility, by the use of self-compacting concrete for the cement-based repair. These results contribute to obtaining a durable repair.