Long-term creep behavior of basalt fiber reinforced polymer bars: Fid-Bau Portal

Long-term creep behavior of basalt fiber reinforced polymer bars

Sokairge, Hesham / Elgabbas, Fareed / Rashad, Ahmed / Elshafie, Hany

Highlights • Creep behavior of basalt fiber reinforced polymer is similar to other types of FRP bars. • The creep rupture time and creep strain of basalt FRP bars depend mainly on the initial stress level. • Fiber volume fraction of basalt FRP bars has significant effect on the long-term creep behavior. • The residual tensile properties of basalt FRP bars are barely affected due to creep up to 1000 h. • Basalt FRP bars are recommended to be used in prestressing application.

Abstract One of the main properties that affects the use of fiber reinforced polymer (FRP) composites in prestressing application is the long-term creep behavior. In this study the long-term creep behavior of basalt fiber reinforced polymer (BFRP) bars was investigated. The initial stress level and the fiber content presented in different diameter are the variables considered in this study. The creep rupture stress, the creep strain, and the residual properties of BFRP were experimentally studied. Moreover, the ratio of creep rupture stress after million-hour (114 years) to the initial ultimate strength of BFRP bars was extrapolated based on statistical analysis of the experimental results to be 62.3% and 57.7% for 6 and-10 mm diameters of BFRP bars, respectively. The test results showed that the creep rupture stress of BFRP bars under different sustained stresses have linear relationship with logarithm of time similar to other types of FRP bars. Additionally, the creep behavior of BFRP bars follows the three stages of creep strain similar to glass and aramid FRP bars. Moreover, based on the test results, the fiber content had proved to have a significant effect on the long-term creep behavior of BFRP bars, since the 6 mm diameter of higher fiber content exhibit lower creep strain and higher extrapolated creep rupture stress than 10 mm diameter. Finally, BFRP bars are recommended to be used in prestressing application.