Flexural Performance of Hybrid Engineered Cementitious Composite Layered Reinforced Concrete Beams

Abstract

This paper presents the experimental investigation to evaluate the flexural performance of newly developed hybrid Engineered Cementitious Composite (ECC) layer at tension zone around the main reinforcement of beam. Four different ECC mixes are used in the beam to evaluate the flexural performance, hybrid ECC based on the low modulus poly vinyl alcohol (PVA) and high modulus steel short random fibre reinforcement. The aim of hybridation is to improve the flexural, energy absorption and ductility performance of reinforced concrete beams. In addition to the compressive strength, young’s modulus, uniaxial tensile strength and bond strength of ECC mixes are determined. ECC with PVA fibre with 2.0% volume fraction mix is kept as reference mix, hybridation is made with PVA (1.35%) and steel (0.65%), PVA (1.00%) and steel (1.00%) and finally with PVA (0.65%) and steel (1.35%). This hybridization has a remarkable achievement in mechanical properties and in the flexural behavior in ECC layered RC beam. From the results, it has been observed that mono fiber ECC reinforced with PVA of 2.0% and hybrid fiber ECC reinforced with 1.35 % of PVA fiber and 0.65% of steel fiber has reasonable flexural characteristics than the conventional beam.

Experimental and Numerical Investigation of Different Types of Jacketing Effect on Retrofitting RC Short Columns Using ECC Concrete

“…Because if a good connection is established at the joint surface of the jacket and the primary column, the behavior of the reinforced column will be closer to the behavior of the integrated specimen. Krishnaraja and Kandasamy [29] have evaluated the effect of ECC layers on concrete beams, which is similar to the purpose of this research. They have concluded that compared with the conventional concrete beam, the ECC layer presence not only leads to significant enhancement in the cracking load, yielding load and ultimate load but also increases the load-bearing capacity, deflection, energy absorption, and ductility due to strain hardening of ECC layer in the concrete beam.…”

Behaviour of hybrid fibre reinforced concrete-filled steel tubular beams and columns

“…From results, it was found that CFST beam with 2% steel fiber volume fraction carries the maximum load with notable deflection due to high modulus of rigidity of fiber [23]. However, the energy absorption capacity of CFST beam with 2% of polypropylene fiber is high when compare with other beams because the polypropylene fiber is a low modulus fiber and which exhibits high elongation with minimum load carrying capacity [24]. Mix M10 and M13 absorb notable load than the M5 mix, but it fails to perform in the deformation.…”

Structural Performance of Concrete Elements Retrofitted by a Geopolymer Strengthening System: Input in the Rehabilitation of Historical Buildings

“… Ductility of repaired RC beam is 71-263% higher than the control specimen. [18] 150x230x1800 or 150x260x1800…”

“…Applying a 25 mm thick SFRG repair material improved the ductility value of the RC beam by at least 7% [17]. On the other hand, using 30 mm thick SFRG repair layer increased the ductility of the strengthened RC beam by 360% [18]. Generally, the increase in ductility would also result to higher toughness or energy absorption capacity of the strengthened beams.…”