The Need for Repair and Rehabilitation of Concrete Structures

This article discusses why repair & rehabilitation is necessary for concrete structures due to poor quality concreting materials, lack of maintenance & other factors. It also explains how ICC Acceptance Criteria 125 & FRP composites can help.

The Need for Repair and Rehabilitation of Concrete Structures

The need for repair and rehabilitation of concrete structures is becoming increasingly important due to the increase in construction activities over the past two decades. Repair refers to the modification of a structure, partially or totally damaged in appearance or serviceability. In some cases, repair measures are necessary even within a few years after the completion of the structure, due to poor quality concreting materials, poor workmanship, lack of maintenance, atmospheric effects, abuse, accidents or natural calamities. Therefore, the adaptation of a concrete structure becomes necessary to extend its service life and ensure the durability of the structure.The rehabilitation provides for the restoration of the structural system as close as possible to the original position.

The worn structure must be brought into line, leveled and with the required strength so that it can be put into service without jeopardizing its safety and usefulness. Before finalizing any plan for the repair and rehabilitation of a worn concrete structure, an expert must be aware of the causes of the danger, the extent of damage to the structure and the current state of the concrete in the structure.Once repairs have been carried out on a distressed structure, post-repair evaluation and evaluation of the structure can be carried out to verify the effectiveness of the repair. Such a task must be entrusted to an 'expert and specialist' in order to make repairs effective and durable. One such expert group is STANDARD REHABILITATORS PRIVATE LIMITED.ICC Acceptance Criteria 125 (AC-12 and AC-178) establish the minimum acceptable criteria for durability, structural performance, and inspection criteria for any CFRP coating system to be considered suitable for structural rehabilitation applications.

The repair process for internal strengthening does not require excavation of a trench, therefore, the FRP composite lining becomes a trenchless structural rehabilitation.The results of this durability study indicate strong potential for CFRP coating systems to work well as a long-term solution for pipeline rehabilitation. As FRPs are non-corrosive and have high specific strength and modulus values compared to their density, their light weight, custom design, acceptable deformability and excellent formability allow for new elements to be manufactured and existing parts made of traditional materials to be structurally rehabilitated.At present and at European level, no well-established design and detail calculation methods have been developed that cover all techniques for on-site use of composite rehabilitation systems in wood and concrete structures. For rehabilitation of external surfaces of metal pipes that have suffered corrosion due to acid attack or alkaline environments when pH value exceeds 10.5, reference should be made to Section 12.3.All fiber types are available in various fiber forms and architectures corresponding to manufacturing processes as well as requirements of FRP composites for structural rehabilitation.SRPL is also expanding consulting services to find intellectual solutions for repairs and rehabilitation of CCR structures by performing appropriate non-destructive testing using latest state-of-the-art non-destructive testing equipment. However, development of appropriate design guidance standards is much more advanced in case of rehabilitation of concrete structures than wooden structures.

Riley Ryan
Riley Ryan

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