Delamination mechanism of GFRP sheet bonded on the reinforced concrete beams

Abstract

Fiber reinforced polymer (FRP) has been developed to be applied for a strengthening of the deteriorated structures. In the form of a sheet, the FRP may be applied for the strengthening of the structures by bonding it to the concrete surface. Glass composed FRP (GFRP) sheet is most commonly used due to its relatively lower cost compared to the other FRP materials. GFRP sheet is applied externally by bonding it on the concrete surface. The strengthened structures should be monitored periodically to ensure the health of the strengthened structures. Regarding the development of monitoring system of the strengthened structure, it is important to study the delamination phenomenon of the bonded GFRP. Therefore the delamination mechanism is important to be clarified. Many studies have been done to investigate the bonding characteristics of GFRP sheet under direct tensile loading. However, the studies on the bonding characteristics of GFRP sheet on the strengthened beams due to flexural loadings are still limited. A series of concrete beams strengthened with GFRP sheet on extreme tension surface were prepared. The beam specimens ware loaded under four-point bending test gradually up to the ultimate capacity. Results indicated that prior to final delamination, a local delamination occurred which was indicated by the suddenly decreasing of an applied load. The delamination of the GFRP sheet may be initiated by the flexural cracks occurred on the beams.

Study Perkuatan Lembaran GRFP Pada Balok Beton Bertulang Akibat Beban Lentur

“…Lembaran FRP bisa dengan praktis mengikat atau menguatkan secara eksternal terhadap lempengan beton bertulang, balok, serta kolom (ACI Comitte 440, 1996). Lembar GFRP diterapkan secara Jurnal Cyclops Teknik Sipil Fakultas Teknik Universitas Yapis Papua ISSN : 2987-5714 eksternal dengan mengikatnya pada permukaan beton untuk diterapkan agar memperkuat struktur yang terus memburuk (Djamaluddin et al, 2019). Penelitian Hijriah et al, (2018) menunjukkan bahwa balok dengan perkuatan GFRP mampu meningkatkan kapasitas lentur dari balok sebesar 4.14 % terhadap balok normal.…”

Effect of Bonding Area on Bond Stress Behavior of GFRP Bars in Concrete

“…The utilization of fiber-reinforced polymer (FRP) bars has been identified as a viable substitute for traditional reinforcement methods. According to literature, FRP bars exhibit several advantages over traditional steel reinforcement, including their non-corrosive and non-conductive properties, high strength-to-weight ratio, cost-effectiveness, and superior resistance to corrosion [1,2].…”