Selecting a Proper Repair System for Rehabilitation of Deteriorated Structures in Severe Environmental Conditions

Abstract

Premature deterioration of civil infrastructure structures in the harsh environmental conditions of marine regions (high humidity, high thermal variation, acidic attacks, high reactivity chemical reactions, improper usage, and natural disasters) leads to the reduction of service life of these structures. Failures in the rehabilitation process have been observed are primarily attributable to insufficient rehabilitation treatment, improper selection of repair materials, and incorrect repair implementation on the structures themselves. To design a suitable repair solution, it is essential that the physical, mechanical, chemical, and electrochemical properties of the repair materials and base (substrate) concrete match properly. In this paper, a novel approach for selecting proper mix design for repairing and maintaining deteriorated concrete structures located in the marine regions of southern Iran has been proposed using multi criteria decision making (MCDM) methods. The technique of random generation (RG) has also been used for uncertainty analysis on the final results. The results of the case study showed that the proposed methodology can be used as a proper tool for the decision making process in similar repair projects.