Document Type

FRP-strengthened and all-FRP structures paper

Publication details

Al-Bayati, G & Al-Mahaidi, R 2014, 'Effective bond length of modified cement-based adhesive for FRP-NSM strengthening system', in ST Smith (ed.), 23rd Australasian Conference on the Mechanics of Structures and Materials (ACMSM23), vol. I, Byron Bay, NSW, 9-12 December, Southern Cross University, Lismore, NSW, pp. 389-396. ISBN: 9780994152008.

Peer Reviewed



Concrete strength for flexure, shear and torsion has been improved using near-surface mounted (NSM) strengthening technology with epoxy adhesives. Due to the hazards from toxic fumes and to enhance the performance of structures in high-temperature environments, a new cement-based adhesive has been used as an alternative to epoxy in several studies. The application of cement-based adhesive has been studied for externally-bonded reinforcement (EBR) and the critical failure was debonding between fibre and adhesive. To make the cementitous adhesive meet the requirements of the NSM technique, a new modification of cement-based adhesive has been accomplished. The aim of this paper is to find the critical bond length of the modified cement-based adhesive with the NSM technique using FRP laminate. To determine the effective bond length of this adhesive, an experimental program of pull-out testing using a single-lap shear test set-up was undertaken with different bond lengths. Three prisms were tested for each bond length in this investigation. The results show the effective bond length for the modified cement adhesive. The experimental results also indicate that the adhesive is efficient with the NSM technique. Finite element analysis was carried out using the ATENA 3-D computer program to shed further light on the performance and the properties of this cementitous adhesive. The results confirm the experimental analyses, and good agreement was found between the experimental results and finite element analysis.