What are plate dowels?
Plate dowels allow contraction of the slab in two lateral directions. Traditional dowel bars have to be inserted through timber formwork making the removal of the formwork difficult. Plate dowels use a plastic sleeve that is nailed to the timber formwork making the formwork removal very simple.
What is concrete dowel?
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.
What are diamond dowels used for?
Diamond™ Dowels are plate dowels suited for construction joints in concrete slabs and pavements. They transfer vertical loads across the joint and minimise differential deflection between adjacent slab panels under load. Easy to install, they attach directly to wooden form board or metal separation plates.
What is a PNA Diamond Dowel?
Tapered plate dowels for formed construction joints. The industry standard for construction joints, the Diamond Dowel® System achieves superior joint stability measurements of 0.01 in (25 mm) and delivers reliable, maintenance-free and serviceable concrete flatwork.
What are slab dowels?
Dowel bars are short steel bars that are installed in concrete slabs to provide a mechanical connection that doesn’t restrict horizontal joint movement. They are designed to reduce joint deflection and stress in the approach and leave slab by increasing load transfer efficiency.
What is a rebar dowel?
Rebar dowels are used to brace the joints between two concrete elements. When the rebar is not being used to hold the concrete members together, post-installed anchor theory can be applied. This eliminates the need to embed the bar deep enough into the base material to develop the rebar for steel failure.
Should I dowel concrete?
Properly installed dowel bars are a vital part of the joint between two concrete pavement slabs. They allow freedom of movement in an otherwise rigid pavement structure, while also maintaining the essential connection of the pavement.
How long should concrete dowels be?
18 in.
Current recommended practice for doweled joints is for dowel diameters to be one-eighth of slab thickness, dowel spacing to be 12 in., and dowel length to be 18 in. Dowel bars require care in placement to minimize detrimental effects of misalignment.
What is a speed dowel?
Speed Dowel is the pioneering slip dowel installation system that ensures proper dowel alignment for positive load transfer in slab-on-ground concrete joints. Speed Dowel® provides a practical dowel alignment method for transferring loads across, and managing stresses within concrete slab-on-ground joints.
What is dowel joint?
A dowel joint is a wooden joint that is partially or totally held in place by the addition of small round wooden rods called dowels. A dowel construction can provide added stability for the joint of two wood pieces. This kind of joint is popular in many kinds of woodworking.
What is the minimum dowel spacing?
12 inches
The cages perform no function other than initial alignment assistance. Dowel bars are typically 32 to 38 mm (1.25 to 1.5 inches) in diameter, 460 mm (18 inches) long and spaced 305 mm (12 inches) apart.
What is the difference between a dowel and rebar?
What is the difference between tie bars and dowel bars in concrete carriageway? Tie bars are deformed rebars or connectors used for holding faces of rigid slabs in contact to maintain aggregate interlock. Dowel bars are smooth round bars which mainly serve as load transfer device across concrete joints.
What sizes do diamond dowel tapered plates come in?
The Diamond Dowel® tapered plates are available in three sizes (depending on the loads, wheel type and repetition): 1/4″ (6mm) – typically used in 4″- 7″ slab depths 3/8″ (10 mm) – typically used in 7″- 9″ slab depths 3/4″ (20 mm) – typically used in 9″ plus slab depths
What are steel plate dowels used for?
Steel plate dowels carry loads across a construction joint, maintain vertical alignment between adjacent slabs and allow concrete shrinkage both perpendicular and parallel to the joint. Construction joints are formed or placed into slabs to define stopping places or the extent of an individual concrete placement.
What are the advantages of taper dowel?
The Taper Dowel provides joint stability, load transfer and smooth transition, without restraining concrete floor movement. Material minimizes joint spalling and random cracking for long-lasting quality joints. doweling method in accordance with:
How are plate dowels installed in concrete slabs?
Workers install plate dowels by inserting them into either a precut slot in the concrete forms or cavities in leave-in-place pocket formers that were attached to the forms and cast into the first slab.