Experimental investigation of the secondary creep of fiber reinforced concrete at high stress: Macroscopic measurement and digital image correlation

Abstract

The secondary creep of Fiber-Reinforced Concrete (FRC) under high sustained stress levels is a key issue for structural durability when considering the capacity to guarantee small crack widths under serviceability states. This study investigates the time-dependent deformation of FRC beams under loading level Ps/P0 greater than 80% (Ps is the load at reloading and P0 is the load before unloading) with various aggregate sizes by using both the classical macroscopic measurement and the digital image correlation analysis (DIC). Notched beams made of FRC and Fiber Reinforced Mortar (FRM) (i.e. without aggregate) were firstly pre-cracked by static load and then applied by a loading equal to 80% of strength. The evolution of the deflection, the crack width, and the crack propagation were both measured by traditional sensors and calculated by DIC. Comparison between results from FRC and FRM materials highlights the influence of microstructure heterogeneity on the secondary creep of FRC. Moreover, the DIC analysis helps to get insights on the secondary creep mechanism.

Hydro-mechanical-damage model for the secondary creep of fiber reinforced mortar at high stress-to-strength ratio

“…However, the damage due to the loading is considered and the comparison between the numerical simulations and the experimental results will be made on the creep phase. All experimental flexural creep tests obtained by simulation show good agreement to the quasi-static experimental results [12]…”

“…In a recent experimental work, digital image correlation was employed to show that the particle heterogeneity can increase the secondary creep of FRC concretes under sustained high load levels [12].…”

An innovative model to estimate the tension field inclination considering crack growth for steel plate shear wall

“…Some researchers have investigated the crack and its propagation. In doing so, the effect of crack on dynamic analysis [17], and the method of crack propagation simulation [18,19] have been investigated, and aspects of crack propagation in those researches have been proposed. Due to limited results reported on the crack effect on SPSWs, in this paper, the behavior of SPSWs regarding the crack effect is examined parametrically and numerically.…”