Flexural Behavior of RC Beams Strengthened with GFRP Laminate and Retrofitting with Novelty of Adhesive Material

Abstract

Two unique approaches were proposed to strengthen the bond between the glass fiber reinforcement polymer (GFRP) and the RC concrete surfaces. The two bonding materials are epoxy (EP) and geopolymer (GPP) with different ratios of short glass fibers (SGF). The experimental program includes seven reinforced concrete (RC) beams that have the same cross-section (150 mm × 200 mm) and are 1500 mm in length. The first beam is the control beam (B0-Control). The next three beams B1-0-GPP, B2-0.6-GPP, and B3-1.2-GPP have GPP with SGF ratios of 0%, 0.6%, and 1.2%, respectively. The last three beams B4-0-EP, B5-0.6-EP, and B6-1.2-EP have EP with SGF ratios of 0%, 0.6%, and 1.2%, respectively. The results show that the failure loads of beams B1-0-GPP, B2-0.60-GPP, and B3-1.2-GPP are greater than the control beam B0-Control by approximately 20.80%, 25.60%, and 31.40%, respectively, whereas the failure loads of beams B4-0-EP, B5-0.6-EP, and B6-1.2-EP are greater than the B0-Control by approximately 16.90%, 26.90%, and 26.10%, respectively; it is also noted that debonding occurs. In addition to the adhesive material, GPP has a great effect on increasing the beam’s failure load capacity due to the enhanced interfacial bond shear strength. Additionally, a finite-element program ABAQUS is performed to verify the experimental results.

Advanced Composite Materials for Structure Strengthening and Resilience Improvement

“…In addition, the type of adhesive material used is important to prevent debonding of the CFRP. Rageh has proposed two unique methods to enhance the adhesion between glass fiber-reinforced polymer (GFRP) and RC concrete surfaces, as shown in Figure 1 [3]. The purpose of Figure 1 is to demonstrate how CFRP is bonded to RC concrete beams through two different bonding materials, EP and GPP.…”

Tests and finite element modeling of concrete beams reinforced with reused steel bars

“…Numerical models were also developed by researchers to study the behavior of RC members. [11][12][13][14][15][16][17] Hamoda et al 14,15 developed finite element models (FEM) to study the flexural and shear behavior of RC beams strengthened with engineered cementitious composite and stainless-steel strips. Rageh et al 12 developed FEM of RC beams strengthened with glass fiber reinforcement polymer subjected to flexural load.…”

“…[11][12][13][14][15][16][17] Hamoda et al 14,15 developed finite element models (FEM) to study the flexural and shear behavior of RC beams strengthened with engineered cementitious composite and stainless-steel strips. Rageh et al 12 developed FEM of RC beams strengthened with glass fiber reinforcement polymer subjected to flexural load. The FEM was found to accurately predict the experimentally observed performance of RC beams.…”

“…Numerical models were also developed by researchers to study the behavior of RC members 11–17 . Hamoda et al 14,15 developed finite element models (FEM) to study the flexural and shear behavior of RC beams strengthened with engineered cementitious composite and stainless‐steel strips.…”