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It is necessary to have a sound understanding of the un u eĬaused by fire or structural problems such as overloading or impact damage.Īssessments are to be made of the defects in a concrete structure, in order to identify their causes and the ability of the structure to continue to perform its function, so that a suitable repair and protection option can be chosen. The aim of the investigation and testing regime should be to obtain sufficient information on the condition of the structure to enable appropriate remedial steps to be taken.
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While some methods require extraction of samples for subsequent laboratory testing, the majority of test methods suggested can be applied directly to concrete in structures as in-situ tests. The concrete properties assessed by the methods referred to in this document range from strength to those associated with potential durability including capacity to protect embedded reinforcing steel. In addition to the investigation methods and assessment, this paper discusses the selection and application of materials and methods for the protection, repair, and strengthening of concrete structures.Ĭoncrete, its components and its properties at various stages maturity can be tested in many ways. These options could range from doing nothing, to complete demolition and replacement of the structure.
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Once the results of a structural concrete investigation are evaluated, those making decisions on the future of the structure being investigated have various options. The reinforcement dimensions, orientation and concrete cover are determined using rebar scanners and the depth of carbonation effects could be measured using phenolphthalein indicator. The corrosion potential and the extent of corrosion could be ascertained using half-cell potential and electrical resistivity methods. Concrete strength is generally determined using core testing, rebound hammer, ultrasonic pulse velocity, pull off, pull out test and son on. The presence of concrete defects like voids, honeycombs, spalls and cracking could be detected using techniques such as ultrasonic pulse velocity and ground penetrating radar methods. Apart from the physical characteristics, the corrosion status & potential and also the deterioration of concrete due to chemical attack are important aspects to be ascertained during the forensic investigation of structures. Forensic Investigation of Concrete Structures and Structural RehabilitationĪssistant General Manager – Quality Uralungal Labour Contract Cooperative Society LtdĮngineering Innovation Design & Consulting LLC Madinat Qaboos, Sultanate of OmanĪbstract The importance of integrity assessment of concrete structures, latest testing procedures and structural rehabilitation options available are not known to many in the construction profession.