AN INVESTIGATION INTO GEOPOLYMER ADHESIVE AS A VIABLE SUSTAINABLE MATERIAL FOR NSM STRENGTHENING OF RC BEAMS IN SHEAR

Dhiyaa J. Kadhim; Ali K.  Al-Asadi

doi:10.30572/2018/KJE/160433

Authors

Dhiyaa J. Kadhim MSc. Student, Civil Eng. Dept., University of Thi-qar, Thi-qar, Iraq
Ali K. Al-Asadi Professor, Ph.D., Civil Eng. Dept., University of Thi-qar, Thi-qar, Iraq

DOI:

https://doi.org/10.30572/2018/KJE/160433

Keywords:

NSM, geopolymer adhesive, strengthened, RC beams, shear

Abstract

This paper aims to investigate the performance of geopolymer adhesive (GPA) as a substitute for epoxy in the near-surface-mounted (NSM) technique to enhance the shear strength of reinforced concrete (RC) beams. Seven RC beams of 1200 mm in length, 120 mm in width, and 160 mm in height were tested under three-point loading. The specimens involved one control beam and six strengthened beams. This paper investigates several parameters, namely the types of paste adhesive (epoxy or geopolymer), spacing of NSM bars (80 and 65 mm), and inclined NSM bars (90° and 45°). The initial crack opening load, ultimate load-carrying capacity, deflection, and crack pattern. According to the results, the epoxy adhesive can increase load capacity by up to 96.36%. Geopolymer adhesive yielded a maximum of 68.62% compared to un-strengthened RC beams. The first crack load on strengthened specimens was increased by up to 18% compared to un-strengthened RC beams

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