TITLE:
The Effects of Degradation Phenomena of the Steel-Concrete Interface in Reinforced Concrete Structures
AUTHORS:
Bozabe Renonet Karka, Bassa Bruno, Nadjitonon Ngarmaïm, Alladjo Rimbarngaye
KEYWORDS:
Reinforced Concrete Construction, Steel-Concrete Interface, Corrosion Degradation Rate, Adhesion, Bearing Capacity
JOURNAL NAME:
Journal of Materials Science and Chemical Engineering,
Vol.11 No.3,
March
23,
2023
ABSTRACT: Reinforced concrete (RC) constructions are the innovation of sustainable constructions replacing masonry constructions. Despite this, the use of concrete and steel to improve the performance of structural members in service is a recurring problem due to the immediate or overtime appearance of cracks. The objective of this work was therefore to assess the damage phenomena of the steel-concrete interface in order to assess the performance of an RC structure. Samples of approximately 30 cm of reinforcement attacked by rust were taken from broken reinforced concrete columns and beams in order to determine the impact of corrosion on high adhesion steel (HA) and therefore on its ability to resist. The experimental results have shown that the corrosion degradation rates of reinforcing bars of different diameters increase as the diameter of the reinforcing bars decreases: 5% for HA12; 23.75% for HA8 and 50% for HA6. Using the approach proposed by Mangat and Elgalf on the bearing capacity as a function of the progress of the corrosion phenomenon, these rates made it possible to assess the new fracture limits of corroded HA steels. For HA6 respectively HA8 and HA12, their initial limit resistances will decrease by 4/4, 3/4 and 1/4. Based on the results of this study and in order to guarantee their durability, an RC structure can be dimensioned by taking into account the effects of reinforcement corrosion.