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The Diamond Dowel® System -- Tapered Plate Dowels for Formed Construction Joints

Tapered Plate Dowels for Formed Construction Joints

Reliably deliver serviceable construction joints and deliver joint stability measurements of .01 inches (.25 mm) in concrete flatwork applications with the Diamond Dowel® System. The specific size and tapered shape of the Diamond Dowel® System reliably provides joint stability, positive load transfer and continuity of surface profile to minimize joint spalling, eliminate tripping hazards and improve joint filler performance without inducing restraint. Since 1997, contractors and engineers have realized a return on their investment in the Diamond Dowel® System in more than 1.5 billion square feet of placed concrete worldwide through the delivery of highly serviceable concrete flatwork.

The Diamond Dowel® System Helps You:

Collect your retainage
Reduce your call backs and save labor
Optimize the amount of steel in your project
Limit your liability
Deliver cost-effective concrete flatwork

Efficient Constructability

Eliminates drilling bulkheads, greasing/spinning dowels and removing/reinstalling dowels
Allows for easy stripping of forms
Ensures positive load transfer and eliminates cracking from restraint with reliable dowel alignment
Reduces job-site trip hazards

Available in Three Sizes:

1/4" (6 mm)
3/8" (10 mm)
3/4" (20 mm)

Steel Options:

Plates are manufactured from steel certified to meet ASTM A36 (1/4” and 3/8”) or ASTM A108 (3/4”)

For corrosion resistance, plates can be manufactured from:

Electroplated zinc steel certified to meet ASTM B633 Type II; or
Grade 304 stainless steel certified to meet ASTM A240

Installation Options:

The Diamond Dowel® System is engineered to guarantee the fastest and most perfectly aligned installation of load transfer at construction joints.

Diamond Dowel® installation template

Reduces labor costs by more than 75 percent when compared to round dowel installation
Included in each box of Diamond Dowel® pocket formers for job-site convenience

Diamond Dowel® bulkhead

Delivers consistent, even and true joint performance when used in conjunction with the Diamond Dowel® System
Saves set-up time with the pre-cut top chamfer
Optimizes fast, efficient alignment of the Diamond Dowel® pocket former using the pre-cut trench groove
Eliminates the need for a release agent with a bond breaker overlay
Reduces waste by up to ten percent compared to lumber as it is straight and true
Bulkheads are 1/4 inch (6 mm) shorter than full elevation of slab to accommodate allowable tolerances in the subgrade
Available in standard 16 foot (4.8 meter) length

Performance-Based Engineering

All published engineering on the spacing of plate dowels at the construction joints is based on the geometry and size of the Diamond Dowel® System.

Reduce Joint-Edge Spalling

Delivers acceptable joint stability per industry guides of less than .01 inch (.25 mm) and continuity of surface profile across the joint
Minimizes initial dowel looseness through the consistent and tight manufacturing tolerance in the formation of the Diamond Dowel® pocket former
Reduces additional dowel looseness by delivering an engineered 6.36 inches (159 mm) of steel at the joint and 5.45 square inches (136.25 mm) of steel (given a joint opening of 1/8 inch [3 mm]) in the first inch of embedment where the bearing, shear and flexural stresses are the highest
Permits dowel placement where the curling stresses are highest, to within six inches (150 mm) of the joint intersection Minimize Random Cracks and Ensure Joint Activation
Allows for free horizontal movement of the concrete without restraint with 45° tapered diamond plate geometry
Minimizes horizontal and vertical alignment deviations of the tapered plate with the Diamond Dowel® bulkhead or installation template
Allows for a 3/8 inch (9.4 mm) of lateral movement at a joint that opens 1/8 inch (3 mm)

Product Performance Characteristics:

Materials

Diamond Dowel® 1/4” and 3/8” plates are manufactured from steel certified to meet ASTM A36, providing consistent modulus of dowel support to ensure reliable quality and performance; 3/4” plates are manufactured from Grade 1018 cold-finished steel certified to meet ASTM A108 to ensure thickness tolerances of the manufactured material reliably enables delivery of the allowable total differential deflection of .01 inches (.25 mm)
Diamond Dowel® pocket former is molded from high density ABS plastic with internal collapsible fins and spacers that ensure load plate is installed in correct position, maintains integrity of the pocket former and creates a vertical void to its vertical faces
Extracted, harvested or recovered, as well as manufactured, in the USA from recycled steel and eligible for LEED® credits

Processes