Evaluation of the fracture energy methods used in fiber reinforced concrete pavements by the maximum undamaged defect size concept (original) (raw)

Many fiber types are used in fiber reinforced concrete ﴾FRC﴿ pavements. The maximum undamaged defect size ﴾dmax﴿ concept has been applied to predict notch‐based fracture in different types of concrete. The definition of "the maximum undamaged defect size" is the maximum size of a defect in a material does not affect or decrease its strength. The present paper applies this concept to different types of fiber reinforced concrete ﴾FRC﴿ pavement, namely, glass fiber reinforced concrete ﴾GFRC﴿ pavement and steel fiber reinforced concrete ﴾SFRC﴿ pavement. Due to the quasi‐brittle manner of concrete, various fracture models have been developed to study the crack propagation in the pavement structures. The fracture energy was determined based on the recommendation of the RILEM Committee 50‐ FMC. An experimental study was carried out to investigate the effect of adding short fibers, steel or glass, in controlling the fracture energy of concrete. The analysis was invoked for constan...