TY - JOUR
T1 - Performance of glass fiber reinforced polymer bars under elevated temperatures
AU - Alsayed, Saleh
AU - Al-Salloum, Yousef
AU - Almusallam, Tarek
AU - El-Gamal, Sherif
AU - Aqel, Mohammed
N1 - Funding Information:
The authors would like to acknowledge the Center of Excellence for Research in Engineering Materials (CEREM), College of Engineering, King Saud University, for funding the project and to the Specialty Units for Safety and Preservation of Structures, MMB Chair for Research and Studies in Strengthening and Rehabilitation of Structures and the Civil Engineering Department, for their support in conducting this research project.
PY - 2012/7
Y1 - 2012/7
N2 - This paper investigates the residual tensile properties of newly developed glass fiber reinforced polymer (GFRP) bars after being subjected to elevated temperatures for different periods. A total of 120 GFRP specimens were tested in this study. Half of the samples were covered with concrete while the other half were bare bars. The specimens were subjected to three different controlled temperatures (100, 200 and 300 °C) for three different periods (1, 2, and 3 h). Test results showed that almost no losses were observed in the tensile modulus after all exposure periods and temperatures. Losses in the tensile strength, proportional to the level of temperature and exposure period, were recorded. The bars with concrete cover showed higher residual tensile strength compared to their counterparts without coating. The concrete cover was more effective at the lowest temperature level (100°C) and at the shortest time period (1 h). Scanning Electronic Microscopy (SEM) technique was also used to investigate the effect of elevated temperature on the degradation mechanism of the GFRP bars. The results showed that increasing the temperature level affected the resin matrix surrounding the glass fibers and consequently affected the bond between the fibers and the matrix.
AB - This paper investigates the residual tensile properties of newly developed glass fiber reinforced polymer (GFRP) bars after being subjected to elevated temperatures for different periods. A total of 120 GFRP specimens were tested in this study. Half of the samples were covered with concrete while the other half were bare bars. The specimens were subjected to three different controlled temperatures (100, 200 and 300 °C) for three different periods (1, 2, and 3 h). Test results showed that almost no losses were observed in the tensile modulus after all exposure periods and temperatures. Losses in the tensile strength, proportional to the level of temperature and exposure period, were recorded. The bars with concrete cover showed higher residual tensile strength compared to their counterparts without coating. The concrete cover was more effective at the lowest temperature level (100°C) and at the shortest time period (1 h). Scanning Electronic Microscopy (SEM) technique was also used to investigate the effect of elevated temperature on the degradation mechanism of the GFRP bars. The results showed that increasing the temperature level affected the resin matrix surrounding the glass fibers and consequently affected the bond between the fibers and the matrix.
KW - A. Glass fibers
KW - B. High-temperature properties
KW - B. Strength
KW - D. Electron microscopy
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U2 - 10.1016/j.compositesb.2012.01.034
DO - 10.1016/j.compositesb.2012.01.034
M3 - Article
AN - SCOPUS:84861191360
SN - 1359-8368
VL - 43
SP - 2265
EP - 2271
JO - Composites Part B: Engineering
JF - Composites Part B: Engineering
IS - 5
ER -