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ABSTRACT
To achieve accurate design lengths of rebars, ensure reduced rebar congestion and adequate load transfer in reinforced concrete construction, the tensile and flexural behavior of various coupling systems were accessed to validate the use of the coupling systems with more favorable parameters in terms of results.
10mm,12mm and 16mm rebars with coupling systems made from Bamboo splits and binding wire of thickness 8mm and 3mm were procured. Coupling systems of lengths 300mm and lapping length of 50mm were fabricated according to design specifications. All coupling systems were tested for tensile and flexural resistance on the universal tensile testing machine of 600kN capacity.
Results obtained showed all 16mm samples performed unsatisfactory in both tension and flexure, having mean values of 196.46N/mm2 as tensile strength and 23.77N/mm2 as flexural strength. Thus, showing slightly better performance in tension. However, all 10mm and 12mm binding wire coupled samples showed greater strength in tension (361.54N/mm2),while the 10mm binding wire coupled samples showed greater strengths in flexure (26.7N/mm2).The 10mm and 12mm binding wire coupled samples however showed greater tensile strength values ,with repetitive downward displacements, although having smaller sectional areas compared to the control 16mm sample form previous literature. Adequate quality control and rigidity must be ensured to achieve safety requirements and load transfer.
