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Polymers 2016, 8(3), 67;

Near Surface Mounted Composites for Flexural Strengthening of Reinforced Concrete Beams

Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
Department of Construction Engineering, College of Engineering, University of Dammam, 31451 Dammam, Saudi Arabia
Author to whom correspondence should be addressed.
Academic Editors: Alper Ilki and Masoud Motavalli
Received: 20 December 2015 / Revised: 19 February 2016 / Accepted: 25 February 2016 / Published: 3 March 2016
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Existing structural components require strengthening after a certain period of time due to increases in service loads, errors in design, mechanical damage, and the need to extend the service period. Externally-bonded reinforcement (EBR) and near-surface mounted (NSM) reinforcement are two preferred strengthening approach. This paper presents a NSM technique incorporating NSM composites, namely steel and carbon fiber-reinforced polymer (CFRP) bars, as reinforcement. Experimental and analytical studies carried out to explore the performance of reinforced concrete (RC) members strengthened with the NSM composites. Analytical models were developed in predicting the maximum crack spacing and width, concrete cover separation failure loads, and deflection. A four-point bending test was applied on beams strengthened with different types and ratios of NSM reinforcement. The failure characteristics, yield, and ultimate capacities, deflection, strain, and cracking behavior of the beams were evaluated based on the experimental output. The test results indicate an increase in the cracking load of 69% and an increase in the ultimate load of 92% compared with the control beam. The predicted result from the analytical model shows good agreement with the experimental result, which ensures the competent implementation of the present NSM-steel and CFRP technique. View Full-Text
Keywords: NSM composites; flexural behavior; cover separation; analytical model; crack behavior NSM composites; flexural behavior; cover separation; analytical model; crack behavior

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Hosen, M.A.; Jumaat, M.Z.; Alengaram, U.J.; Islam, A.B.M.S.; bin Hashim, H. Near Surface Mounted Composites for Flexural Strengthening of Reinforced Concrete Beams. Polymers 2016, 8, 67.

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