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Bamboo can use at the simple concrete construction because of the tensile strength of its mechanical property. Meanwhile, a slippery surface of the bamboo caused cracks in the bamboo reinforced concrete beam (BRC) not to spread and yield slip failure between a bamboo bar and concrete. Load test at the BRC beam yield humble load capacity. This study aims to improve the capacity and behavior of BRC beam bending by giving waterproof coating, sand, and hose clamp installation. The beam test specimen with the size of 75x150x1100mm made as many as 26 pieces with the variety of reinforcement. The hose clamp used on the bamboo reinforcement varies with a distance of 0 cm, 15 cm, 20 cm, and 25 cm. The testing using a simple beam with two-point loading. The test results show that BRC beams have different bending behavior compared to the steel reinforced concrete beam (SRC).

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The implementation of building infrastructure development to improve people’s lives is important. The use of reinforced concrete structures has increased very rapidly. But many buildings are failed and are not safe because of overloading, changes in function and configuration of buildings, poor maintenance, and natural disasters. Many methods developed to reduce the damage caused by earthquakes so that the development of methods to strengthen and repair building structures is needed to anticipate damage to buildings. This study focuses on beam-column joint cracks with simple building characteristics, column size 20/20 and beam 15/20 (monolithic) with concrete quality fc’= 21 MPa, so it is necessary to evaluate and repair beam-column joint cracks in buildings because of overload. The method used was experimental and testing in a laboratory with a single static load and Ultrasonic Pulse Velocity (UPV) test to determine the density after repair. Test specimens are SK (control-specimens) and SK-repairing. The results showed that the beam-column joint performance before and after repairs had relatively the same flexural strength of 1,669 kg and 1,686 kg, while the stiffness was lower at 14.48%. The velocity after repair average is 3,327.5 m/s (medium-category). The elasticity average modulus of the test is 20.43 GPa.

The use of GFRP reinforcing bars as an innovative material for substituting steel bars in reinforced concrete is now increasingly popular for structures which are located in corrosive areas. The GFRP bars have low modulus of elasticity (35-51 GPa), such that the stiffness of GFRP reinforced concrete will be lower than those of the corresponding steel reinforced concrete. Lower in stiffness means larger deflection will occur. This paper aims to introduce the use of GFRP bars in reinforced concrete beams particularly in terms of theoretical deflection calculation of GFRP reinforced concrete beams with ratios of 0.5%; 0.8%; 1.1%, and 1.7%; and based on the equations proposed by several researchers and the design guidelines from several countries such as ACI 440.1R-15; CSA S806-12; CNR-DT 203/2006; ECP 208-2005; Fib bulletin 40 (2007).