CONFINEMENT INFLUENCE IN CRACKING AREAS SINGLE REINFORCED CONCRETE
Eko Walujodjati, Ida Farida
Sekolah Tinggi Teknologi Garut, Program Studi Teknik Sipil, jl. Mayor Syamsu No.1 Jayaraga, Garut, eko.walujodjati[at]sttgarut.ac.id
Abstract
Reinforced concrete as a building structure plays an important role in holding the load. The combination of concrete and reinforcement in collaboration with the load is determined by the perfect bond of the two materials. Bond testing on reinforced concrete has been carried out. The axial load is given in reinforced concrete results in internal cracking of reinforced concrete around the threaded reinforcement area. An area within the radius of cracking of the concrete around the reinforcement has also been obtained. The action is needed to reduce the area of cracked concrete by giving restraints using spherical spiral reinforcements within the concrete crack radius. It is expected to increase the strength of the reinforcement and concrete around it. The restraints using plain reinforcement in the area have been carried out. The methodology used is Pull Out on single reinforced concrete cylindrical specimens with confinement and without confinement. Concrete cylindrical test specimens with a diameter of 150 mm 200 mm high with single reinforcement with a diameter of 10 mm, and spiral reinforcement as confinement with an identification diameter of 4 mm and spacing of 22.5 mm and 45 mm. Placed within the radius of cracking of the concrete around the reinforcement. Pull out the test is carried out with gradual loading until it passes. The Pull Out test results indicate a fault movement from the edge that is loaded to the free end. The spiral coil of reinforcing steel as a restraint is relatively insignificant and increases strongly. The restrained specimen produces a larger fault at the end of the load, when the initial fault occurs at the free end, compared to the specimen without restraint. The difference in the increase in stickiness with the spiral spacing of steel reinforcement 22.5 mm and 45 mm has not been seen.
Keywords: bond strength, reinforced concrete, internal cracking, restraint, failed
Topic: Civil Engineering