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Performance of Carbon Fibre Reinforced Polymer (CFRP) Strips for Flexural Strengthening of Reinforced Concrete Beams Made of High Strength Fly Ash Concrete

Hussein Hassan, Asma Abd Elhameed (2008) Performance of Carbon Fibre Reinforced Polymer (CFRP) Strips for Flexural Strengthening of Reinforced Concrete Beams Made of High Strength Fly Ash Concrete. Masters thesis, UNIVERSITI TEKNOLOGI PETRONAS.

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Abstract

Fibre reinforced polymer (FRP) composites have shown high potential as repair materials for civil infrastructures. The main attributes of FRP composites are high strength, light weight, good resistance to chemicals and non-magnetic and non-conductive properties. Compressive strength is one of the most important design parameters for concrete structures; it drives the design process and can influence the cost of a project. By the use of cement replacement materials (CRMs) at the optimum level the cost of concrete can be substantially reduced and its properties can also be enhanced. Fly ash (FA) is a byproduct form coal-fired power plants and has extensively been used for producing high strength, high performance concrete. There is a lack of work in the CFRP external strengthening of reinforced concrete beams made of blended cement concrete. In this study, three concrete mixes, with three different cementitious material contents such as 335, 360 and 380 kg/m 3 that incorporated fly ash content of 0%, 20%, 30% and 40% as the partial replacement of cement. The effects of CFRP system in terms of optimum length and ductility ratio for flexural strengthening were tested on 150 mm wide, 200 mm high and 2000 mm long RC beams. Three different lengths of 1333 mm, 1667 mm and 2000 mm of CFRP plate that represented 67%, 83% and 100% respectively of the total span length were chosen and the control beams were tested without CFRP strengthening. The behaviours of reinforced concrete beams made of normal and fly ash concretes strengthened with CFRP plates were compared and examined. It was found that high strength concrete such as 50 MPa can be produced by mixing as low as 228 kg/m3 OPC content. Concrete compressive strength up to 84 MPa was obtained for the OPC content of 304 kg/m3 with 20% fly ash content. It was found that by using CFRP system for external flexural strengthening, an increase in the load-carrying capacity up to 96% over the control beams was obtained. The length of the CFRP plate that achieved the optimum load-carrying capacity was 1667 mm which was 83% of the total span length. This length also provided an adequate ductility index of 3.1 compared to 4.6 for that of the control beam. The results of ultimate loads and deflections of normal and fly ashbased RC beams were obtained identical at first crack and at ultimate levels. It has been proved that the CFRP system could be used as effectively with fly ash based concrete beams as it has been used with normal concrete beams.

Item Type: Thesis (Masters)
Academic Subject : Academic Department - Civil Engineering - Structures, materials and construction
Subject: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Engineering > Civil
Depositing User: Users 2053 not found.
Date Deposited: 29 Oct 2013 10:48
Last Modified: 25 Jan 2017 09:45
URI: http://utpedia.utp.edu.my/id/eprint/10007

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