Because of the plate dowel's load transfer efficiency, plate spacing along the joint is larger than typical values used for round or square dowels. Also, if the slab reinforcement is continuous through a construction joint, the joint may function more like a tied joint than a contraction joint. With 12-inch centre spaces, they carry vertical loads across your structure’s concrete joints and maintain the vertical alignment of your slabs. Engineers first solved this problem by replacing smooth round dowels with square dowels cushioned on the vertical sides with a compressible material. Dowelled control joints (dummy joints) are most commonly used on highway and airport runway constructions, where continuous run concrete trains are used and the dowels can be automatically inserted. Using plate dowels that allow horizontal slab movements both perpendicular and parallel to joints lowers the risk of random cracking. Aquajet's Extension Kit for the AquaCutter 410, Aqua Cutter 710 and Aqua Spine provides an additional 5 to 8 feet of reach for concrete contractors. 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Continuous reinforcement through joints can restrict joints from opening freely. This can lead to stress concentrations, resulting in subsequent spalling of the concrete. Construction joints are different than contraction joints (also called control joints) but may be designed and constructed to open freely like contraction joints to help control unsightly, random slab cracking. Ernest Schrader, "A Solution to Cracking and Stresses Caused by Dowels and Tie Bars," Concrete International, July 1991, pp. Only use butt-type construction joints with or without keyways where vertical load transfer and alignment are not a concern. Walker and Holland calculated that a 1/4-inch-thick x 4 1/2-inch diamond dowel spaced at 18 inches on center is equivalent to a 3/4-inch round dowel spaced at 12 inches on center. Effect of Dowels on Stresses 2nd International Conference on Best November 2, 2011 Practices for Concrete Pavements X-direction n Principal Stresses 160 142 125 107 89 72 54 37 19 2-16-33-51-68 X-direction n Principal Stresses 116 104 92 80 68 57 45 33 21 9-3-15-26-38 Nondoweled joint Max Stress = 1120 kPa Doweled joint Max Stress = 812 kPa Explaining the new ACI Polished Concrete Slab Finishes Specifications. These ¾ x 14 x 1 x 16-inch smooth round dowels are often used with 7-8 or 5-6-inch-thick concrete slabs. 40 -45. When the second slab is placed, the second side of the plate dowels for all three systems becomes incased in concrete. Dowels are used in concrete joining to control and prevent the cracking within the concrete slab and to form contraction joints in concrete slabs. When aligned carefully and only bonded to the concrete on one side of the joint, round dowels help carry vertical loads across the joint, maintain vertical alignment of the slabs and allow slab movements perpendicular to the joint. Spaces allow adjacent slabs to move relative to each other in a direction parallel to the construction joint and significantly reduce the risk of random cracking caused by restrained concrete shrinkage. The Role Wireless Concrete Sensors Can Play During the Pandemic. Plate dowels can accommodate horizontal slab movements parallel to joints by creating spaces along the vertical sides of the plates. Dowels are needed at these locations for all … Because of the geometry, size of the plates and installation procedures, it is easy to achieve and maintain proper dowel alignment thus reducing the potential of mechanically locking the joint from opening. Installing and keeping round and square dowels aligned properly during the construction process can be difficult and many consider this issue a shortcoming of both round and square dowels. However, concrete shrinkage occurs in all directions causing slab movements both perpendicular and parallel to doweled joints. Technology designed by Perdue engineers looks to verify concrete's maturity onsite, without extensive offsite testing. A butt-type construction joint will not transfer loads or maintain vertical slab alignment across the joint. Butt-type construction joints are basically free slab edges that deflect under forklift, wheeled traffic or vertical loads. MCI-2062 Biological-Based Surface Cleaner, The Viking Ride-On Scraper - Featuring a Sealed Cab for Your Safety, Benefits of Hydrodemolition for Noise-Restricted Construction Sites. 3. By allowing slab movements perpendicular to the joint, doweled construction joints can act like contraction joints and relieve shrinkage stresses perpendicular to joints. dowel diameters for concrete slabs less than 10 in. After stripping the forms, workers insert the plate dowels into the cavity of the leave-in-place pocket formers. Only butt- and doweled-type construction joints can open freely or function like contraction joints. Dowels are located in transverse joints of Jointed Plain Concrete Pavements (JPCP) and they are used to provide load transfer between individual slabs, reduce faulting and improve performance. Because a concrete slab only has around 50% of its load-bearing capacity at the edges, dowels are needed to support the slab, help bear and transfer weight, and permit controlled movement of the two adjacent slabs (technically called the “approach and leave slabs”.) Therefore, construction joints that perform like contraction joints are desirable. Concrete structural elements such as wall sections, bridge abutments and slabs on grade rely on dowels to transfer loads across the joints. For a home with a concrete footing, concrete block stem wall, and a … Dowel bars Dowel bars are placed at the transverse joints of concrete pavement and they take part in partial wheel load transfer from one slab to its adjacent slab. 2). On your next slab-on-ground project, consider using plate dowels at construction joints to efficiently transfer vertical loads, maintain vertical alignment of the slabs and help reduce the risk of random cracking. Cutting Concrete in the Cold: Use the Right Blade. This Ground Breakers Podcast episode talks about rebar tying and how the ergonomic design of your tools affects health and safety of workers – as well as the bottom line. Measure dust and gas in your construction site in one device, TigerLoc Signs Exclusive Agreement with Nox-Crete. 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