Effect of Fibre Reinforced Concrete and Behaviour in Rigid Pavement Naser Kabashi Faculty of Civil Engineering and Architecture, University of Prishtina, Prishtine, Kosovo Email: naser.kabashi@uni-pr.edu Cenë, Krasniqi , Ragip Hadri, Anite Sadikaj Faculty of Civil Engineering and Architecture, Bregu i Diellit P.N. 10000 Prishtine, Kosova Email: cene.krasniqi@uni-pr.edu, ragip.hadri@uni-pr.edu, anita.sadikaj@uni-pr.edu Abstract— Concrete such widely material is present in different constructions. Nowadays the behaviour the rigid pavement is on the expansion and need more analysis in improvement the properties of concrete. The lack of tensile strength and durability under the severe conditions is one of the orientation or target in this paper. The improvement of the concrete in rigid pavement will be focused on using the fibres, in this case the steel and polypropylene fibres. Fibre reinforcement (depend of type of fibres) is expected to improve the mechanical performance, deformability, fatigue and cracks under the loading. The percent of fibres is oriented to change the brittle failure, and in this paper, we can analyses the different percentage of fibres and difference effect from steel and polypropylene fibres. The comparison of the results will lead us to propose the type and percentage depend of structural characteristics. Index Terms—Concrete, FRP, Strengthening, Flexure, Deformations I. INTRODUCTION Concrete in pavement structures is the layered structure on which vehicles travel. It serves two purposes: to provide a comfortable and durable surface for vehicles and to reduce stresses on underlying soils. In scope of developing and increasing the loadings in pavement structures, our intention is oriented in improvement the behaviour the rigid pavements using the reinforcement with different reinforcement materials: steel and Polymers. Improvement will be focused on the Mechanical Properties, such are: Ductility; Fracture Toughness; Flexural Strength; Shrinkage and Cracking Properties, etc. Concrete can be characterized as a brittle material with a low tensile strength and strain capacity. Fibre reinforced concrete is a concrete containing dispersed fibres. This means that, unlike ordinary reinforced concrete with an appropriate minimum percentage of reinforcement bars, a softening response is observed for fibre concrete after cracking. In contrast to plain concrete, the ductility is significantly increased as a result of fibres bridging cracks and its intrinsic brittleness is overcome. This is very beneficial for the durability of concrete structures. Manuscript received December 6, 2017; revised February 1, 2018. Indeed, for a durable structure, small crack widths are necessary in the serviceability limit state. Fibres of various shapes and sizes produced from steel, synthetics, glass and natural materials can be used. However, for most structural and non-structural purposes, steel fibres are the most used of all fibre materials. Synthetic fibres on the contrary are mainly used to control the early cracking in the slabs and the effect will be oriented in improvement of flexural strength and in same time will not be effected in compressive strength. Polymeric fibers are gaining popularity because of its properties like zero risk of corrosion and cost effectiveness Compare the concrete sample behavior with different types of fibres and different percent of fibres , including the comparison with common plain concrete is the main aim of this paper. [1][2][3]. II. EXPERIMENTAL WORK Objectives of Work: • To find out effect of variation of different types of fibres; steel and Polypropylene depend of percentage and effect in properties of FRC. The focused properties in this work are: Workability, Flexural strength, displacements; presence of cracks, Compressive Strength, for rigid pavement constructions. [5][6][7] • To find out optimum dosage of steel and polypropylene fibres for improvement the behaviour through the properties with compare to normal concrete pavement. • To find out the comparing the results using the reinforcement with steel and Polypropylene fibres. • To find out the effect of percent of air voids in concrete in relations with other properties. A. Mix Design of Concrete 1) Materials The using constituent materials in the research works: - Cement CEM I grade 52.5 - Aggregate – lime stone aggregate, Course and fine aggregate with grain size: Fr I (0/4) mm; Fr II (4/8) mm; Fr III (8/16) mm and Fr IV (16/32) mm. 29 International Journal of Structural and Civil Engineering Research Vol. 7, No. 1, February 2018 © 2018 Int. J. Struct. Civ. Eng. Res. doi: 10.18178/ijscer.7.1.29-33