The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Aftab A Mufti - One of the best experts on this subject based on the ideXlab platform.
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MODELLING OF CONCRETE PAVEMENT DOWEL-SLAB INTERACTION
2020Co-Authors: Scott Murison, Ahmed Shalaby, Aftab A MuftiAbstract:In this study, the interaction between a dowel and the concrete slab of a transverse pavement joint are modeled using a finite element analysis tool. The model is designed to investigate the deflection of a dowel bar under traffic loading and the bearing stresses that are produced at the dowel-concrete interface. High bearing stresses can damage the concrete encasing the dowel leading to dowellooseness and eventual slab-faulting. Non-corrosive materials such as fibre-reinforced polymer (FRP) have been introduced as alternative dowel materials. FRP exhibits lower flexural stiffness than typical epoxy-coated steel Dowels, but has been shown to transfer traffic loads across the joint adequately. FRP has provided excellent performance in pavements thus far, but the long-term performance is unknown. This study utilizes the finite element approach to investigate the behavioural differences between steel and lower-strength FRP Dowels under load. Two diameter sizes of each material were modeled in order to determine the effect of dowel diameter on deflections and bearing stresses. Results from the finite element model were compared with widely accepted theoretical solutions and it was found that correlation between the two was sensitive to an elastic parameter known as the modulus of dowel support.
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concrete filled glass fiber reinforced polymer Dowels for load transfer in jointed rigid pavements
Transportation Research Record, 2005Co-Authors: Scott Murison, Ahmed Shalaby, Aftab A MuftiAbstract:Smooth, round steel Dowels have been used for nearly a century to transfer wheel loads across concrete pavement joints. Dowels are subjected to shear and bending stresses caused by traffic loads in addition to curling stresses caused by temperature gradients in pavement slabs. Over time, the use of deicing salts corrodes steel Dowels and causes damage to concrete pavement joints. Alternative dowel materials, such as stainless steel and glass fiber-reinforced polymer (GFRP), have been introduced in recent years. The dominant size of Dowels for highway pavements has remained the same, typically 38 mm in diameter, and costs can be considerably higher for stainless steel compared with epoxy-coated steel Dowels of the same size. Experimental tests at the University of Manitoba, Canada, examined the performance of four dowel types, including the standard 38-mm epoxy-coated steel; 38-mm solid, pultruded GFRP Dowels; and 50-mm and 63.5-mm concrete-filled GFRP tube Dowels. The Dowels were cast in small concrete sl...
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laboratory evaluation of concrete filled gfrp Dowels in jointed concrete pavements
2004 ANNUAL CONFERENCE AND EXHIBITION OF THE TRANSPORTATION ASSOCIATION OF CANADA - TRANSPORTATION INNOVATION - ACCELERATING THE PACE, 2004Co-Authors: Scott Murison, Ahmed Shalaby, Aftab A MuftiAbstract:For decades, smooth, round, steel Dowels have been used to transfer traffic wheel loads across the joints of concrete pavements. These Dowels are subjected to shear and bending stresses due to thermal gradients in the pavement slabs in addition to the traffic loads. Over time, the concrete pavement joints become damaged due to the corrosion of the steel Dowels as a result of the use of de-icing salts. In order to address both the corrosion and bearing stress problems, large-diameter concrete-filled GFRP tube Dowels have been introduced. Experimental work at the University of Manitoba examined and compared the performance of four dowel types including 38 mm epoxy coated steel, 38 mm solid, pultruded GFRP Dowels, and two sizes of concrete-filled GFRP tube Dowels having diameters of 50.8 mm and 63.5 mm each. For the covering abstract of this conference see ITRD number E211395.
Scott Murison - One of the best experts on this subject based on the ideXlab platform.
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MODELLING OF CONCRETE PAVEMENT DOWEL-SLAB INTERACTION
2020Co-Authors: Scott Murison, Ahmed Shalaby, Aftab A MuftiAbstract:In this study, the interaction between a dowel and the concrete slab of a transverse pavement joint are modeled using a finite element analysis tool. The model is designed to investigate the deflection of a dowel bar under traffic loading and the bearing stresses that are produced at the dowel-concrete interface. High bearing stresses can damage the concrete encasing the dowel leading to dowellooseness and eventual slab-faulting. Non-corrosive materials such as fibre-reinforced polymer (FRP) have been introduced as alternative dowel materials. FRP exhibits lower flexural stiffness than typical epoxy-coated steel Dowels, but has been shown to transfer traffic loads across the joint adequately. FRP has provided excellent performance in pavements thus far, but the long-term performance is unknown. This study utilizes the finite element approach to investigate the behavioural differences between steel and lower-strength FRP Dowels under load. Two diameter sizes of each material were modeled in order to determine the effect of dowel diameter on deflections and bearing stresses. Results from the finite element model were compared with widely accepted theoretical solutions and it was found that correlation between the two was sensitive to an elastic parameter known as the modulus of dowel support.
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concrete filled glass fiber reinforced polymer Dowels for load transfer in jointed rigid pavements
Transportation Research Record, 2005Co-Authors: Scott Murison, Ahmed Shalaby, Aftab A MuftiAbstract:Smooth, round steel Dowels have been used for nearly a century to transfer wheel loads across concrete pavement joints. Dowels are subjected to shear and bending stresses caused by traffic loads in addition to curling stresses caused by temperature gradients in pavement slabs. Over time, the use of deicing salts corrodes steel Dowels and causes damage to concrete pavement joints. Alternative dowel materials, such as stainless steel and glass fiber-reinforced polymer (GFRP), have been introduced in recent years. The dominant size of Dowels for highway pavements has remained the same, typically 38 mm in diameter, and costs can be considerably higher for stainless steel compared with epoxy-coated steel Dowels of the same size. Experimental tests at the University of Manitoba, Canada, examined the performance of four dowel types, including the standard 38-mm epoxy-coated steel; 38-mm solid, pultruded GFRP Dowels; and 50-mm and 63.5-mm concrete-filled GFRP tube Dowels. The Dowels were cast in small concrete sl...
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laboratory evaluation of concrete filled gfrp Dowels in jointed concrete pavements
2004 ANNUAL CONFERENCE AND EXHIBITION OF THE TRANSPORTATION ASSOCIATION OF CANADA - TRANSPORTATION INNOVATION - ACCELERATING THE PACE, 2004Co-Authors: Scott Murison, Ahmed Shalaby, Aftab A MuftiAbstract:For decades, smooth, round, steel Dowels have been used to transfer traffic wheel loads across the joints of concrete pavements. These Dowels are subjected to shear and bending stresses due to thermal gradients in the pavement slabs in addition to the traffic loads. Over time, the concrete pavement joints become damaged due to the corrosion of the steel Dowels as a result of the use of de-icing salts. In order to address both the corrosion and bearing stress problems, large-diameter concrete-filled GFRP tube Dowels have been introduced. Experimental work at the University of Manitoba examined and compared the performance of four dowel types including 38 mm epoxy coated steel, 38 mm solid, pultruded GFRP Dowels, and two sizes of concrete-filled GFRP tube Dowels having diameters of 50.8 mm and 63.5 mm each. For the covering abstract of this conference see ITRD number E211395.
Ahmed Shalaby - One of the best experts on this subject based on the ideXlab platform.
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MODELLING OF CONCRETE PAVEMENT DOWEL-SLAB INTERACTION
2020Co-Authors: Scott Murison, Ahmed Shalaby, Aftab A MuftiAbstract:In this study, the interaction between a dowel and the concrete slab of a transverse pavement joint are modeled using a finite element analysis tool. The model is designed to investigate the deflection of a dowel bar under traffic loading and the bearing stresses that are produced at the dowel-concrete interface. High bearing stresses can damage the concrete encasing the dowel leading to dowellooseness and eventual slab-faulting. Non-corrosive materials such as fibre-reinforced polymer (FRP) have been introduced as alternative dowel materials. FRP exhibits lower flexural stiffness than typical epoxy-coated steel Dowels, but has been shown to transfer traffic loads across the joint adequately. FRP has provided excellent performance in pavements thus far, but the long-term performance is unknown. This study utilizes the finite element approach to investigate the behavioural differences between steel and lower-strength FRP Dowels under load. Two diameter sizes of each material were modeled in order to determine the effect of dowel diameter on deflections and bearing stresses. Results from the finite element model were compared with widely accepted theoretical solutions and it was found that correlation between the two was sensitive to an elastic parameter known as the modulus of dowel support.
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concrete filled glass fiber reinforced polymer Dowels for load transfer in jointed rigid pavements
Transportation Research Record, 2005Co-Authors: Scott Murison, Ahmed Shalaby, Aftab A MuftiAbstract:Smooth, round steel Dowels have been used for nearly a century to transfer wheel loads across concrete pavement joints. Dowels are subjected to shear and bending stresses caused by traffic loads in addition to curling stresses caused by temperature gradients in pavement slabs. Over time, the use of deicing salts corrodes steel Dowels and causes damage to concrete pavement joints. Alternative dowel materials, such as stainless steel and glass fiber-reinforced polymer (GFRP), have been introduced in recent years. The dominant size of Dowels for highway pavements has remained the same, typically 38 mm in diameter, and costs can be considerably higher for stainless steel compared with epoxy-coated steel Dowels of the same size. Experimental tests at the University of Manitoba, Canada, examined the performance of four dowel types, including the standard 38-mm epoxy-coated steel; 38-mm solid, pultruded GFRP Dowels; and 50-mm and 63.5-mm concrete-filled GFRP tube Dowels. The Dowels were cast in small concrete sl...
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laboratory evaluation of concrete filled gfrp Dowels in jointed concrete pavements
2004 ANNUAL CONFERENCE AND EXHIBITION OF THE TRANSPORTATION ASSOCIATION OF CANADA - TRANSPORTATION INNOVATION - ACCELERATING THE PACE, 2004Co-Authors: Scott Murison, Ahmed Shalaby, Aftab A MuftiAbstract:For decades, smooth, round, steel Dowels have been used to transfer traffic wheel loads across the joints of concrete pavements. These Dowels are subjected to shear and bending stresses due to thermal gradients in the pavement slabs in addition to the traffic loads. Over time, the concrete pavement joints become damaged due to the corrosion of the steel Dowels as a result of the use of de-icing salts. In order to address both the corrosion and bearing stress problems, large-diameter concrete-filled GFRP tube Dowels have been introduced. Experimental work at the University of Manitoba examined and compared the performance of four dowel types including 38 mm epoxy coated steel, 38 mm solid, pultruded GFRP Dowels, and two sizes of concrete-filled GFRP tube Dowels having diameters of 50.8 mm and 63.5 mm each. For the covering abstract of this conference see ITRD number E211395.
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glass fiber reinforced polymer Dowels for concrete pavements
Aci Structural Journal, 2001Co-Authors: Darren Eddie, Ahmed Shalaby, Sami H RizkallaAbstract:Corrosion of steel Dowels in concrete pavements reduces their useful service life and creates considerable maintenance and repair expenditures. Glass fiber-reinforced polymer (GFRP) dowel bars are a possible maintenance-free alternative that will potentially reduce the overall life cycle cost of pavements, especially in corrosive environments. This paper describes the performance of GFRP dowel bars under static and cyclic loads. Dowels were used for a slab/joint model tested under laboratory conditions. This paper also discusses the results of a field application in which 3 types of GFRP Dowels were installed in a new concrete pavement highway in Winnipeg, Manitoba, Canada. The field performance of doweled joints has been verified under dynamic load testing.
Parthasarathi Mandal - One of the best experts on this subject based on the ideXlab platform.
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Experimental investigation on the combined effect of dowel misalignment and cyclic wheel loading on dowel bar performance in JPCP
Engineering Structures, 2018Co-Authors: Basim H. Al-humeidawi, Parthasarathi MandalAbstract:Abstract A number of previous studies indicated that the joint lockup due to misalignment and looseness of dowel bars may cause joint distress in Jointed Plain Concrete Pavement (JPCP). This article reports a detailed experimental investigation of pull-out load and joint lockup due to dowel misalignment; and dowel looseness caused by the combined effect of misalignment and cyclic traffic load. The test slabs were supported on steel beams with an appropriate amount of vertical stiffness so as to incorporate the effects of underlying layers of real pavements. The article also provides an experimental investigation to assess the suitability of Glass Fibre Reinforced Polymer (GFRP) bars as alternative dowel bars to reduce joint lockup and associated detrimental effects at the dowel-concrete interface compared with epoxy-coated steel Dowels. The results show that the 38 mm GFRP Dowels that have equivalent flexural rigidity ( EI ) to 25 mm steel Dowels can withstand the cyclic traffic load, significantly reduce joint lockup and dowel looseness, and can provide adequate Load Transfer Efficiency (LTE). It was also observed that misalignment affects dowel looseness significantly more than the number of cycles for traffic load. The slab-base separation and orientation of misaligned Dowels have significant effects on the load required to open the joint.
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evaluation of performance and design of gfrp Dowels in jointed plain concrete pavement part 2 numerical simulation and design considerations
International Journal of Pavement Engineering, 2014Co-Authors: Basim H Alhumeidawi, Parthasarathi MandalAbstract:The article presents a numerical investigation using three-dimensional finite element analysis (FEA) to compare the performance of glass fibre reinforced polymer (GFRP) and steel dowel bars as load transfer devices across the transverse joints of jointed plain concrete pavements (JPCP). The FEA model used concrete damaged plasticity formulation to characterise the concrete pavement; elastic, transversely isotropic material characteristics were assumed for the GFRP Dowels and classical metal plasticity formulation was used for the steel Dowels. The numerical results were validated with the experimental results, and a good agreement was achieved. The results showed less stress concentration in the concrete underneath the GFRP Dowels (38 mm diameter) compared with the steel Dowels (25 mm diameter) of similar flexural rigidity. Finally, on the basis of a detailed parametric study, design considerations for the GFRP Dowels in JPCP are suggested.
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evaluation of performance and design of gfrp Dowels in jointed plain concrete pavement part 1 experimental investigation
International Journal of Pavement Engineering, 2014Co-Authors: Basim H Alhumeidawi, Parthasarathi MandalAbstract:Dowel bars are provided at the transverse joints of the jointed plain concrete pavement to allow for expansion and contraction of the pavement due to moisture and temperature changes. This paper presents experimental and analytical investigations for the deflection response of glass fibre-reinforced polymer (GFRP) Dowels for different joint widths and concrete grades. The results were compared with those obtained from investigations into the conventional epoxy-coated steel dowel bars of similar rigidity. The experimental results showed that the 38 mm (1.5 in.) GFRP Dowels perform better in terms of joint face deflection compared with 25 mm (1 in.) epoxy-coated steel dowel bars. In addition, these results showed that the deflection of the GFRP dowel was significantly affected by changing the concrete compressive strength and the joint widths.
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Investigation of different dowel and pavement parameters on joint lockup
2011Co-Authors: Basim H. Al-humeidawi, Parthasarathi MandalAbstract:The jointed plain concrete pavement (JPCP) is one of the most widely used pavement types in highways and airports. Dowel bars are provided for its transverse joints to allow for the axial movements during expansion and contraction due to temperature and moisture changes. Misalignment or misallocation of Dowels during construction process could resist this thermal movement and cause joint lockup, which leads to damages, uncomfortable riding, and distresses for pavements and its foundation (cracking, spalling, corner breaking etc.). Dowel bars and pavement specifications differ according to the local Highways Agencies. This variation affects the load required to open the joints when dowel misalignment exists due to wrongly placing the Dowels during the construction. A numerical analysis is carried out to assess the effect of the pavement system parameters (the concreters compressive strength, dowel bar length and diameter) on the pullout force required to open the joints at different cases of dowel misalignment. The results showed a good agreement with the experimental results and also gave a comprehensive knowledge about the effect of the aforementioned parameters on the pullout load needed for axial movement of slabs in different cases of dowel misalignment.
J J L Morais - One of the best experts on this subject based on the ideXlab platform.
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quasi static behavior of moment carrying steel wood doweled joints
Construction and Building Materials, 2014Co-Authors: T.v.p. Caldeira, Nuno Dourado, A.m.p. De Jesus, M.f.s.f. De Moura, J J L MoraisAbstract:Abstract Dowel-joints involving wood and steel plates were experimentally and numerically studied. The main objective was to analyze the influence of Dowels spacing and dowel-to-end distance on load carrying capacity and stiffness of the structure. A particular attention was dedicated to failure type observed in the experiments, particularly the crack path in the vicinity of the Dowels. A three-dimensional finite element analysis considering mixed-mode (I/II/III) cohesive zone modeling was performed. It was verified that the numerical model is able to reproduce with good accuracy the initial stiffness, ultimate load, locus of the damaged zone and the crack path observed in the experiments.