Experimental investigation of GFRP‐reinforced concrete columns made with waste aggregates under concentric and eccentric loads

Abstract

Nowadays, reducing the waste and recycled material resources in nature and environmental protection, as well as reducing the use of natural resources, has gained the attention of engineers and researchers. One of the ways to reach this goal is to use waste and recycled materials in new concrete members' construction. Additionally, using glass fiber-reinforced polymer (GFRP) rebars has gained high consideration owing to their advantages such as high tensile strength and corrosion resistance. Therefore, this study aims to measure the influence of recycled coarse aggregates (RCA) on the structural performance of reinforced concrete (RC) columns reinforced by GFRP rebars under concentric and eccentric loading conditions. A total of 24 RC columns were cast and subjected to concentric and eccentric loads with different eccentricity ratios (e/h):0 (no eccentricity), 0.25 (moderate eccentricity), and e/h = 0.5 (high eccentricity). A total of 18 columns were strengthened with longitudinal GFRP rebars, and six specimens were considered control samples reinforced by steel rebars. RCA was used at two contents of 0% and 100% in terms of weight as a substitute for natural coarse aggregates (NCA). In addition, to measure the influence of transverse reinforcement, three different spacings were considered: 60, 120, and 180 mm. Evaluation of axial behavior, the strain of rebars and concrete, and the ductility were the main aims of this study. Moreover, a comparison between the experimental results and existing standards was carried out. Findings revealed the adequate axial resistance of specimens when RCA was used. Therefore, RCA incorporation improved the axial resistance of GFRP-RC columns by about 25% and 35% when the stirrup spacing declined by 60 and 120 mm, respectively in comparison with the same specimens made with NCA. However, the influence of RCA on the RC columns' axial behavior was declined by raising the eccentricity distance.Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

Enhancing Flexural Strength of RC Beams with Different Steel–Glass Fiber-Reinforced Polymer Composite Laminate Configurations: Experimental and Analytical Approach

“…The impact of EBR, EBROG, and ENRIG on the performance of RC beams has been the subject of several investigations [6][7][8][9]. The literature indicates that strengthening RC beams with FRP laminates plays an effective role in improving their flexural response [13][14][15][16][17][18][19][20][21][22][23][24][25][26]. In 2010, Mostofinejad and Mahmoudabadi [23] discovered that piercing the stress transfer area between concrete and the FRP sheet inside the concrete substrate, creating longitudinal grooves created on the surfaces of the beams, as opposed to traditional surface preparation, significantly increase the beams' final resistance.…”

“…The most popular way for reinforcing RC beams is the EBR technique. The early debonding of sheets from the concrete surface prevents this technology from achieving the full tensile strength of GFRP laminates [17][18][19][20][21][22]. Mostofinejad and Mahmoudabadi designed the grooving technique to delay or smoothly stop the debonding of GFRP laminates.…”