Copyright © 2018 Authors. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. International Journal of Engineering & Technology, 7 (4.20) (2018) 449-452 International Journal of Engineering & Technology Website: www.sciencepubco.com/index.php/IJET Research paper Possibility of Using Concrete Reinforced by Carbon Fibre in Construction Nada Mahdi Fawzi Aljalawi 1* , Haider M.K. Al-Jelawy 2 1 University of Baghdad, civil engineering department 2 Uruk University * Corresponding author E-mail: naljalawi@yahoo.com Abstract This work focuses on studying the mechanical characteristics of carbon fibre reinforced concrete, containing a different percentage of fibre. This work was carried out using several tests. These tests were hardened density, compressive strength, flexural strength . Tests were performed for specimens at ages of (7,28,60) days. The test results indicated that the inclusion of fibre in the reference concrete mixes did not affect the compressive strength significantly, while the flexural strength was improved. Test results indicated that the flexural strength of (0.75%) carbon fibre concrete specimens are twice that of the reference specimens in age of 28 days . The percentage of increasing the flexural strength for carbon mixes containing fibre by volume fraction of (0.5%, 0.75%) were (23%, 27%) respectively at age of 28 days. Keywords: carbon fiber; compressive strength; flexural strength; reference specimens; density. 1. Introduction Concrete is a composite material made from a filler which represented by the coarse granular material firmed in matrix which represented by the cementitious materials (the binder). The binder will fill the spaces between the filler particles and bond them together. However, it is a weak material having low rigidity and low strain ability that effect its tensile strength. For this purpose, fibre reinforced concrete(FRC)was created. Fibres help with enhancing is better ductile strength, flexural strength, toughness furthermore effect the concrete quality positively [1,2,3]. This study focuses on the effect of carbon fibre on the properties of concrete. Moreover, carbon fibres have low density , particularly compared with steel fibre. Their strength-to density proportion is the highest amongst those most elevated fibres types. Carbon fibres have a higher quality compared to metallic fibres. This motivation was behind their utilization to produce composite materials with good properties such as polymeric composites. [4]. 1.1. Concrete Reinforced by Carbon Fibre Carbon fiber concrete framework composites are auxiliary materials that are picking up in significance quickly because of the abatement in carbon fiber cost and the expanding request of unrivaled basic and practical properties. These composites contain short carbon filaments, ordinarily 5 mm long, as the short strands can be utilized as an admixture in cement (while constant strands can't be essentially added to the solid blend) and short filaments are more affordable than persistent filaments. Be that as it may, because of the frail bond between carbon fiber and the bond network, consistent filaments are significantly more compelling than short strands in fortifying cement. The impact of carbon fiber expansion on the properties of solid increments with fiber volume portion, except if the fiber volume division is high to the point that the air void substance turns out to be too much high (The air void substance increments with fiber substance and air voids will in general negatively affect numerous properties, for example, the compressive quality). The enhanced auxiliary properties rendered via carbon fiber expansion relate to the expanded malleable and adaptable qualities, the expanded tractable flexibility and flexural strength, the upgraded effect obstruction, the decreased drying shrinkage and the enhanced stop - defrost sturdiness. The ductile and flexural qualities diminish with expanding example estimate, to such an extent that the size impact winds up bigger as the fiber length increments . The low drying shrinkage is profitable for extensive structures and for use in fix and in joining blocks in a block structure [5]. 2. Literature Survey This literature review will be limited to research of FRP material externally bonded to the tensile face of concrete beams. In particular, research studying the effect of externally applied FRP materials on the flexural performance of reinforced concrete beams will be reported. Triantifillou and Plevris (1991) used strain compatibility and fracture mechanics to analyze reinforced concrete beams applied with externally bonded carbon fiber reinforced plastics (CFRP). The