Cracks in Reinforced Concrete Beam

Abstract

Cracks in concrete cannot be prevented but the size of the cracks can be controlled. Cracks that occur in concrete are strongly influenced by the nature and characteristics of the concrete constituent materials, especially cement and water. Cracks can occur in the fresh and hard concrete phases. Cracks that occur in concrete can be grouped into two, non-structural cracks and structural cracks. There are several types of non-structural cracks such as crazing, map cracking, plastic cracking due to shrinkage, plastic cracking due to settlement, cracking due to drying shrinkage, cracking due to temperature changes, cracking due to chemical reactions. Structural cracks can be caused by the effects of vibration, earthquake and loads that work beyond capacity. Cracks in concrete beams can be in the form of flexural cracks, web shear cracks, flexure-shear cracks, torsion cracks, bond cracks. The failure that occurs in the beam has a close relationship with the pattern of cracks formed. Cracks that occur in the beam must be repaired so that the damage does not get worse and efforts to strengthen the structure to ensure it remains safe

The comparative study of epoxy and bacterial injections for cracked concrete beam flexural strength

“…Cracks that occur in reinforced concrete greatly affect the performance of the reinforcement. If it cracks to the reinforcement it will cause delamination (removal of the concrete cover from the concrete slab structure due to oxidation of the reinforcement) and spalling (peeling of the concrete surface due to corrosion of the reinforcement or collision) [1]. The crack was caused by several things, such as environmental influences, less than optimal initial design, poor maintenance, and natural events such as earthquakes.…”

Analysis Of The Addition Of Steel Plates Reviewed to The Compresivve Strength Capacity Of The T-Beam

“…A summary of research in this area is available from Pangestuti et al (2020), who explains the behavior of flexural strengthening of beams with the placement of CFRP plates as external reinforcement (BF beam) is less effective because the bending strength decreases by 33.3% and the deflection decreases by 79% as compared with BN beam. That is because of the debonding failure of CFRP, so the concrete beam is not able to hold the pull force that occurs, and consequently, the beam collapses and fails due to its brittle condition [10]. Yohanes et all (2015) studied compressive strength and the strong bending relationship of the reinforced concrete beam.…”