Abstract
The structural components of reinforced concrete that withstand the tensile stress will be bonding stress affected by the friction between the reinforcing bar and the concrete. Anchoring depth, reinforcement diameter, and concrete quality are commonly assumed to influence bond strength; besides, the support distance of reinforcement may be one of the influencing factors. The samples in this study were cylindrical specimens with a diameter of 15 cm and 20 cm for the concrete compression strength and the bond-strength test, respectively, and double-L size 30 x 20 x 7.5 cm for the concrete shear test. Variables in this study include variations in the support distance represented by variations in the diameter of the supporting plate hole, namely 10 mm, 35 mm, 60 mm, 85 mm, and 110 mm. Plain reinforcement with a diameter of 10 mm was anchored at 150 mm depth in the centre of the concrete cylinder. The experimental results obtained 26.49 MPa and 10.86 MPa for concrete compression dan shear strength, respectively. Based on various diameters of the supporting plate hole, the hole diameter of 10 mm to 60 mm had a stable increase in bond strength and a significant decrease when a larger hole diameter was used.
Highlights
In reinforced concrete structures, steel reinforcement is placed into concrete to provide tensile resistance to bending loads or to assist concrete in carrying compressive loads [1]
Bond strength testing is done by placing a concrete cylinder on a loading frame equipped with a hydraulic jack and load cells, the reinforcing bar embedded in the cylinder is pulled until pulled (Pull-Out Test, Fig. 1)
Based on the results of the research, the following conclusions can be drawn: (1) In normal concrete with plain reinforcement is obtained, the maximum bond strength at the diameter of the supporting plate is 60 mm by 3,760 MPa, and the minimum bond is obtained at 110 mm at 3,218 MPa
Summary
Steel reinforcement is placed into concrete to provide tensile resistance to bending loads or to assist concrete in carrying compressive loads [1]. If the steel reinforcement and concrete bond are good, there will be a slight crack when the reinforcement is pulled out of the concrete [3]. The anchoring strength in concrete specified in the standards usually assumes that the bond is uniform. This assumption is not entirely correct because anchoring depth affects the bond stress [4]. The mode of a connection failure in axial tensile loading follows the order of slip reinforcement, cracked concrete, steel plate bending and reinforcement breaking [7]. Factors that influence the value of bond strength are anchoring depth, reinforcement diameter, and concrete quality. The function of the supporting plate with a hole in bond strength testing is as a concrete barrier so that it does not lift and break during the test
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
