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The dowels need to be smooth, round, epoxy and made of bond breaker coated steel conforming to requirements. The bond breaker is to be applied on all surfaces of the dowel bar. The expansion caps belong at each end of the dowel bar and the dowel bar support chairs are used to firmly hold the dowels centered in the slots during backfill operations.
A precast concrete walled house under construction An example of low-quality precast concrete with exposed dowels, connectors, indications of cracks, and malformations, even during its installation, Barangay Lantic, Carmona, Cavite, Philippines Interior view of the walls, supports, and roof of a precast commercial shop in Williston, North Dakota, US.
Rebar (short for reinforcement bar or reinforcing bar), known when massed as reinforcing steel or steel reinforcement, [1] is a tension device added to concrete to form reinforced concrete and reinforced masonry structures to strengthen and aid the concrete under tension. Concrete is strong under compression, but has low tensile strength.
The Dowelmax Jig with distance gauge bar. The Dowelmax is a loose tenon dowelling jig manufactured by the O.M.S. Tool company in Canada.The manufacturer claims that the small manufacturing tolerances of 0.026 millimetres (0.0010 in) for the aluminium, brass and steel components of the jig ensure accuracy and repeatability.
Control joints, or contraction joints, are sometimes confused with expansion joints, but have a different purpose and function. Concrete and asphalt have relatively weak tensile strength, and typically form random cracks as they age, shrink, and are exposed to environmental stresses (including stresses of thermal expansion and contraction).
A dowel plate. The traditional tool for making dowels is a dowel plate, an iron (or better, hardened tool steel) plate with a hole having the size of the desired dowel.To make a dowel, a piece of wood is split or whittled to a size slightly bigger than desired and then driven through the hole in the dowel plate.
Similar to a dowel nail but with a head on the shank. Double-headed (duplex, formwork, shutter, scaffold) nail – used for temporary nailing; nails can easily pulled for later disassembly; Dowel nail – a double pointed nail without a "head" on the shank, a piece of round steel sharpened on both ends
The length which the dowel extends into the existing slab, the length which the dowel extends into the new concrete, and the connections between the dowels and the new reinforcing are determined by the structural engineer, subject to building code constraints. Argyriou 07:04, 22 August 2006 (UTC)
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