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Arabian Journal for Science and Engineering

, Volume 39, Issue 12, pp 8499–8506 | Cite as

Application of the Maximum Undamaged Defect Size (d max) Concept in Fiber-Reinforced Concrete Pavements

  • Hossam El-Din M. SallamEmail author
  • Muhammad Mubaraki
  • Nur Izzi Md. Yusoff
Research Article - Civil Engineering

Abstract

Many fiber types are used in fiber-reinforced concrete (FRC) pavements. The maximum undamaged defect size (d max) concept has been applied to predict notch-based fracture in different types of concrete. The present paper applies this concept to different types of FRC pavement, namely, glass fiber-reinforced concrete pavement and steel fiber-reinforced concrete 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 fiber, steel or glass, in controlling the fracture energy of concrete. The analysis was invoked for constant fiber length of 25mm. The flexure test of single-edge notched and unnotched specimens was performed using three-point bending configuration. Four different values of crack-depth ratios were considered, mainly, 0.00, 0.10, 0.25, and 0.40. Experimental results showed that the calculated d max based on RILEM Committee 50-FMC is greater than the maximum aggregate size (MAZ). This means that there is no compatibility between the flexural strength of FRC and its fracture energy calculated based on RILEM Committee 50-FMC. Therefore, a modified calculation of the area of load-deflection curve was suggested to improve the reliability of fracture energy measured based on RILEM Committee 50-FMC. It is found based on this modification that d max is less than 0.7 MAZ.

Keywords

Undamaged defect Fracture energy FRC Rigid pavements Flexural strength 

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Copyright information

© King Fahd University of Petroleum and Minerals 2014

Authors and Affiliations

  • Hossam El-Din M. Sallam
    • 1
    Email author
  • Muhammad Mubaraki
    • 1
  • Nur Izzi Md. Yusoff
    • 2
  1. 1.Department of Civil Engineering, College of EngineeringJazan UniversityJazanSaudi Arabia
  2. 2.Department of Civil and Structural Engineering, Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaBangiMalaysia

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