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Mukherjee, Abhijit
- Pultruded Fibre Reinforced Polymer Planks as Stay-In-Place Formwork for Concrete Structures
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Authors
Affiliations
1 Department of Civil Engineering, Thapar University, Patiala 147 001, IN
2 Department of Civil Engineering, Curtin University, Perth, WA 6102, AU
1 Department of Civil Engineering, Thapar University, Patiala 147 001, IN
2 Department of Civil Engineering, Curtin University, Perth, WA 6102, AU
Source
Current Science, Vol 113, No 02 (2017), Pagination: 245-252Abstract
A feasibility study in which a pultruded fibre reinforced polymer (FRP) plank was used as stay-in-place (SIP) form serving as formwork during wet stage and as reinforcement during hardened stage is presented here. First, the strength and stiffness of the FRP plank serving as formwork for concrete casting under construction stage was verified by sand-filling test. Then shear tests were carried out to develop proper bond technique between FRP and concrete, so that they can perform as composite structural member. Thirdly, static tests on beams were conducted to evaluate the load-carrying capacity and failure modes of the proposed hybrid beam. The overall investigation showed the feasibility of using the FRP plank as a SIP form-work.Keywords
Adhesive and Aggregate Bonding, Fibre-Reinforced Polymer, Stay-In-Place Formwork.Full Text
References
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- Defect Detection in Plated Structures Using Ultrasonic Guided Waves
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Authors
Affiliations
1 Thapar University, Patiala-147004, IN
1 Thapar University, Patiala-147004, IN
Source
Journal of Pure and Applied Ultrasonics, Vol 34, No 2-3 (2012), Pagination: 53-59Abstract
Many structures like ship hulls, oil storage tanks, off shore oil platforms etc. are assemblies of large plate like components which are prone to deterioration and damages. These structures are subjected to damages in the form of environmental degradation, excessive loads, fatigue loads, corrosion, etc. If these changes go unnoticed at the initial stages, it may lead to catastrophic failure of the systems. This necessitates the development of an efficient monitoring technique of these plated structures in which the large areas can be scanned quickly. Guided ultrasonic waves which have stress distributed through thickness of the plate and can propagate over longer distances provide an effective solution in such cases. This study presents a non-destructive technique for damage detection in plates using guided ultrasonic waves. Plate specimens with a notch like defect geometries were tested with varying defect depths and location. Two ultrasonic testing techniques-pulse transmission and pulse echo were effectively used in the experiment. Time of flight (using phase velocity) measurement in pulse echo and amplitude attenuation measurement in pulse transmission were metrics of exact location and extent of damage in the specimens.Keywords
Ultrasonic, Pulse Echo, Transmission, Guided Waves, Plate Structures, Dispersion.Full Text
- Damage Detection in Reinforcing Bars in Concrete Using Ultrasonic Waves
Abstract Views :132 |
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Authors
Affiliations
1 Deptt. of Civil Engineering, Thapar University, Patiala-147704, IN
1 Deptt. of Civil Engineering, Thapar University, Patiala-147704, IN
Source
Journal of Pure and Applied Ultrasonics, Vol 31, No 3 (2009), Pagination: 85-93Abstract
Reinforced concrete (RCC) is the most common form of civil engineering structures these days in which the steel bars are embedded in the concrete to improve the tensile strength. These bars deteriorate with time due to environmental action and excessive stresses and it remains unnoticed inside concrete. This degradation can be catastrophic if not detected at an early stage and can results in huge loss of life and property. Hence, it calls for a rigorous inspection and monitoring technique for the steel reinforcement and ultrasonic waves provide a potentially attractive solution. This study highlights the use of ultrasonic waves for damage detection in bars in air, which will be further extended to bar embedded in concrete. Minimum intrusion has been effected by exciting one end of the bar with an ultrasonic pulse and recording its propagation at the other end using the bar as a waveguide. Ultrasonic guided waves with frequencies in the range of 1-4 MHz were generated in healthy and damaged bars by varying the input frequencies of an ultrasonic transducer. Bar diameter of 12mm was used and damages were inflicted in the form of symmetrical area reduction in reinforcing bars. Two ultrasonic testing techniques, pulse echo and pulse transmission, were used to monitor healthy as well as damaged bars. Time of flight measurement in pulse echo indicated the damage location accurately. Amplitude of received signal in both pulse echo and pulse transmission was a measure of extent of damage. The two techniques when used in combination can predict the existence, location as well as the extent of damage in steel bars in air. The same methodology was then extended to steel bars embedded in concrete.Keywords
Ultrasonic Guided Waves, Steel Bars, NDT, Damage Detection.Full Text