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- Title
EVALUATION OF CONCRETE COVER DEPTH OF SELECTED INSTITUTIONAL BUILDINGS USING PROFOSCOPE.
- Authors
AKINGBONMIRE, S. L.; AFOLAYAN, J. O.; OLANITORI, L. M.
- Abstract
The importance of concrete cover depth to reinforcement bars cannot be over emphasized in reinforced structures. Investigation of cover depth in reinforced concrete buildings help to detect and prevent the so-called corrosion of rebars and cracking. This paper reports a non-destructive investigation of two existing reinforced concrete institutional buildings. Though, there are several methods of non-destructive testing techniques for measuring cover depth such as ground penetrating radar (GPR), cover meter, infrared thermography, etc., the type used for this research is Profoscope by Proceq. The reliability and accuracy of this equipment was first tested on six newly cast reinforced concrete block specimens of 250 mm x 300 mm x 300 mm with varying cover depths and re-bar diameters. The concrete is made up of grade 20 with water cement ratio of 0.5. The Profoscope was used on the field to locate and estimate the cover depth of the structural beam and column elements of the selected buildings. The results of the calibration show that the Profoscope is a relatively reliable equipment for estimating cover depth, but with its ease of use, durability, compactness, lightweight and robustness, it has the limitation of measuring the cover to reinforcements up to only a maximum depth of 80 mm. The analysis of the field data shows that about 7% of the columns and 5% of the beams in one of the buildings, and 2% of the columns and 7% of the beams in the second building fail to meet the minimum requirement of 20 mm as specified in Table 3.4 of BS 8110-1:1997 under any condition of exposure. It is noted that the total number of structural members that fail to meet the minimum requirement is seemingly insignificant, but the consequence of abnormal loading or exposure of the affected members may be substantial depending on their locations in the main structural system. The need for proper and prompt maintenance strategy on the examined buildings is advised.
- Subjects
REINFORCED concrete corrosion; GROUND penetrating radar; REINFORCED concrete; STRESS corrosion cracking; CONCRETE; RELIABILITY in engineering; COLUMN design &; construction
- Publication
Annals of the Faculty of Engineering Hunedoara - International Journal of Engineering, 2021, Issue 1, p111
- ISSN
1584-2665
- Publication type
Article