Abstract
Concrete structures are deteriorated due to environment conditions. Strengthening of existing structures are the most important challenges in the Civil Engineering. Recently, Basalt fibre are used for strengthening due to various advantages such as good range of thermal performance, high tensile strength, resistance to acids, good electromagnetic properties, inert nature, resistance to corrosion. This study presents the flexural behavior of Unidirectional and Multidirectional Basalt Fibre Reinforced Polymer (BFRP) composites, strengthened with reinforced concrete beams. For flexural strengthening of reinforced concrete beams, totally nine beams of size 100.160.1700 mm were cast using M20 grade concrete and tested under two point loading. One beam was used as reference and four beams were strengthened with uni directional BFRP composite and four beams were strengthened with Multi directional BFRP composite at bottom surface alone in the form of single layer, double layers, three layers and four layers, respectively. Test result indicates, the first crack load of strengthened beams with unidirectional BFRP increased by 14.98 to 66.79% when compared to reference beam and multi layered BFRP increased by 6.79 to 47.98%. The ultimate load carrying capacity increases from 8.6 to 34.6% in unidirectional BFRP and 5.66 to 20% in multidirectional BFRP when compared to reference beam. This study presents the enhancement in the structural behavior of BFRP strengthened beams compared with reference beam.
Highlights
In recent years, repair and retrofitting of existing structures such as buildings, bridges etc., have been amongst the most important challenges in Civil Engineering
A total number of nine reinforced concrete beams of size 100×160×1700 mm were cast, strengthened after 28 days water cured with Unidirectional and Multidirectional Basalt Fibre Reinforced Polymer (BFRP) composites and tested under static four point loading conditions
Uni-directional and multi directional BFRP strengthened beam tested under two point bending test: The deflection at first cracking load reduced to 7.10, 14.2, 20.71 and 34.9%, for U1, U2, U3 and U4 strengthened beams, respectively when compared to control concrete beam
Summary
Repair and retrofitting of existing structures such as buildings, bridges etc., have been amongst the most important challenges in Civil Engineering. Various rehabilitation technique have been used such as steel plates bonded to the tension side of the structure (Rahimi and Hutchinson, 2001). It has several problems including durability, manipulation and heavy weight. This leads to the introduction of advanced composite material, Fibre Reinforced Polymer (FRP) in structural engineering. It has various benefits like good fatigue resistance, corrosion free, excellent weight to strength ratio and flexibility to conform any shape. The new composite material BFRP has been developed because of its superior properties like very high tensile strength, more modulus of elasticity and non corrosive when compared with previous FRPs
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