Retrofitting techniques of damaged concrete structure for environment concern: A review

Abstract

Initiation and progression of damages in the concrete systems is the cause of reduction of structural strength and its durability. The significant retrofitting strategies are required to improve the damages and thus, the performance of infrastructures can be enhanced. The damages in the concrete system is due to several factors viz., ingress of alkaline water, wet-dry cycle, sulfate attack, thermal changes, chloride penetration, and freeze–thaw cycle etc. Changes in the shape and size of concrete segments before and after retrofitting decreases the strength of structural systems and consequently, reduced the durability of retrofitted materials. This review paper is motivated on the application of the retrofitting techniques using Fiber Reinforced Polymer (FRP) material for environment concerned. The deterioration of concrete structure and FRP retrofitted materials durability were discussed. The durability aspect of damaged concrete structure retrofitted with FRP materials under alkaline water, wet-dry cycle, freeze–thaw cycle, open cracks, and water immersion were reviewed. The de-bonding of FRP materials have been described to improve the structural integrity. The suitability of various retrofitting techniques were covered. This paper have been included the retrofitting techniques for the improvement of infrastructural facilities and further, the cracks filled rich cement mortar with FRP over that was the key finding. The review paper will facilitate innovative research directions to the industrialist and researchers.