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32857 Parchem Technical Data Compendium 2015_Crop4emag.pdf

CONTENTS CONCRETE REPAIR CORROSION CONTROL GROUTS & ANCHORS PROTECTIVE COATINGS INDUSTRIAL FLOORING SURFACE TREATMENTS JOINT SEALANTS CONCRETE JOINTING ROOFING WATERSTOPS WATERPROOFING JOINT FILLERS TIMBER FLOORING ALPHABETICAL INDEX 396 Technical Data Dowel Cradles Sheet Dowel cradle systems for concrete slabs and pavements Uses Most suited to large concrete pours particularly when laser screed techniques are used. Cradles are designed for use along contraction joints, together with the base crack inducer and a surface saw-cut provide the optimal contraction joint. Dowel Cradles supplied with round, square, rectangular or tapered plate dowels at centres selected by the engineer and can be plastic-wrapped or fitted with covers to cater for lateral movement and concrete shrinkage. Advantages „ Available heights to suit slabs 100 mm to 300 mm thick „ Ideal for sawn contraction joints „ Supplied in 3 m lengths for rapid installation „ Simple installation – no bar chairs required „ Minimises set up time Description Dowel Cradles are a prefabricated welded cage designed to hold dowels in exact horizontal alignment at the correct level within the concrete slab. Available in three styles to suit the type of dowel being used. All cradles are fully welded and prefabricated in 3 m lengths to suit slab thicknesses from 100 mm to 300 mm. Round Dowel Cradles incorporate shrink wrapped round dowels in black, galvanised and stainless steel. Round Dowel Cradles are available as a special order. Square Dowel Cradles incorporate square dowels and either Dowelmaster or Metal Dowel Covers. Available in 16, 20, 25 mm dowel sizes in black, galvanised and stainless steel. Plate Dowel Cradles are the most efficient system by limiting differential deformation between slabs. Plate Dowels are secured in the fabricated cradle and are well suited for contraction joints where high load capacities are required. Available in 6 or 10 mm plate sizes in black, galvanised and stainless steel, sleeves are colour coded: 6 mm are orange and 10 mm are blue. PD3 Dowels™ are tapered plate dowels assembled into cradles of 3 m nominal length. They are available with either 6 mm and 10 mm thick dowels spaced at 450 mm or 600 mm centres, and for slab thicknesses ranging from 150 mm to 300 mm. The tapered plate dowels are 300 mm long and are made from AS/NZS 3679.1 Grade 300 steel. PD3 Dowels™ have the same load transfer capacities and deflection characteristics as rectangular Plate Dowel Cradles™. Installation Instructions Mark position of contraction joint with string line or a paint line on the sub-grade (or on top of poly sheet if used). If Ground Crack Inducer is to be used, place this directly over the marked line, then place first Dowel Cradle centrally over the marked line. Place second Dowel Cradle over marked line, spacing the first dowel of the second cradle from the last dowel on the first cradle an equal distance to the dowel spacing on the cradles. Place subsequent cradles similarly. Once cradle is correctly positioned, cut the cross restraints to allow independent movements of the two cradle halves contained within the adjacent concrete slabs. Install slab reinforcement mesh (if specified) as directed by the slab designer. Pour concrete as usual ensuring concrete placement and minimum reinforcement coverage is achieved as per slab design. Note: When placing concrete, care should be taken not to move the cradles, nor stand on them. Install Crack-A-Joint or saw cut the contraction joint as directed. July 2008


32857 Parchem Technical Data Compendium 2015_Crop4emag.pdf
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