A comparison of construction joint ability on concrete slab applied at construction site

• Published in: ARPN journal of engineering and applied sciences 2016-02, Vol.11 (4)
• Main Authors: Osman, Mohamad Hairi Bin, Tami, Hannifah Binti, Rahman, Nor Azira bt Abdul
• Format: Article
• Language: English
• Subjects: Concrete construction; Construction; Construction sites; Continuity; Deflection; Energy absorption; Slabs; Stiffness
• ISSN: 1819-6608; 1819-6608

Construction joints are stopping places in the process of placing concrete, and construction joints are required because in most structures it is feasible to place concrete in one casting work. The amount of concrete that can be placed at one time is depend on the batching capacity and capabilities to construct formwork. A good construction joint should provide adequate flexural and shear continuity through the interface. In this study, the effect of type of construction joints on the performance of concrete structural elements is experimentally investigated. Six slab samples with dimensions of 700x400x150 mm were tested. The variables investigated are the type construction joints. All sample were tested using 100 kN computer controlled versatile electronic testing machine named as Magnus Frame. The sample was positioned in the machine so that the deflection at middle of sample measured at each load step. The results of the experimental program indicated controlled sample have the maximum applied load, deflection, stiffness and energy absorption. Sample incline joint named as joint sample 1 have the higher applied load, deflection and energy absorption compare to other joint sample, but joint sample 2 using Hy-Rib Mesh to form concrete joint have the higher stiffness compare to other joint sample. The value of joint sample 1 maximum load is 25.93kN, deflection were 0.68mm and energy absorption 8.261kN-mm, joint sample 2 have 47.36kN/mm stiffness compare to joint sample 2 which only have 34.58kN/mm. It was found that the Hy-Rib Mesh construction joint is the best joint as it have the maximum stiffness, higher stiffness of concrete have a higher characteristic of rigidity.