Influence of the Shape of the Borassus Rod on the Concrete-Borassus Adhesion

Abstract

The present scientific work aims to determine the type of Borassus rod shape that provides better adhesion with concrete. To achieve this objective, the pull out test was carried out on concrete-borassus specimens made for this purpose. The adhesion constraints have been determined. Before carrying out the actual pull out test on each type of test specimen, the characteristics of the aggregates used in the formulation of concrete by the Dreux Gorisse method were determined through appropriate laboratory tests. The compression test was carried out on twelve (12) 16/32 concrete specimens including 3 to 7 days, 3 to 14 days, 3 to 21 days and 3 to 28 days of curing age. The compressive strength of concrete at 28 days is 22.40 ± 0.33MPA. It emerges from the work that the rods of ronier notched on two sides adhere more to the concrete than all the other forms through its bond stress which is of the order of 80 ± 17,32 bars, greater than all the other stresses of '' adhesion of which 70 ± 5 bars for the palm trees crenellated on two sides, 66,67 ± 11,54 bars for the sanded palm trees stems, 58,33 ± 2,89 bars for those notched on four sides, 45 ± 5 bars for those wound with annealed wire and 40,67 ± 1,15 bars for the rods of palm trees covered with small cubes. As for the control test piece, the single palm trees talk, its adhesion stress is of the order of 55 ± 5 bars. This made it possible to remember that the palm tree shapes notched on two sides, crenellated on two sides, silted up and notched on four sides are those which improve the concrete-Borassus Aethiopum bond