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DuraDrive®

DuraDrive® is built around the same specifications as standard DuraDrive®, but with enhanced characteristics and excellent durability for extreme climates and resistance to freeze-thaw cycles.

Performance Characteristics

Durability

  • 5-8% air entrainment for excellent freeze/thaw protection
  • Minimum 300 kg of GU cement
  • 0.45 maxim
  • 0.45 maximum water/cement ratio

Placement

  • Ease of placement due to increased slump
  • Increased productivity
  • 160mm + 30mm slump

Finishing

  • Reduced bleed water
  • Reduced set times due to maintained water to cement ratio (no added water to reduce hydration efficiency)

Economy

  • Less labour required due to easier placement
  • Reduced warranty issues
  • Reduced shrinkage and cracking as a result of no extra water being added

Construction Techniques to Follow:

Site Preparation

  • All topsoil and vegetation removed to below grade
  • Uniformly packed granular base (10-25mm aggregate)
  • Dampened base material prior to concrete placement (no standing water, mud or snow)
  • Forms constructed with minimum thickness (50 mm material) and well-oiled with form release
  • Stakes used at maximum 1m intervals for bracing
  • Reinforcing steel is recommended but not required (Note: reinforcing steel does not prevent cracking)

Placing & Finishing

  • Under no circumstances is water to be added to take the concrete above the specified slump range of 160mm + 30mm
  • Water can be added by the delivery driver only to maintain the slump range
  • Discharge concrete as close as possible to where it is to be placed
  • Do not use a tined garden rake, use a concrete specific rake (concrete placer) or a square pointed shovel
  • Screed (strike-off) with a straight edge to final elevation
  • Form construction joints to a minimum of ¼ of the thickness of the slab (e.g. a 100mm thick driveway should have joints a minimum of 25mm deep)
  • Steel concrete tools are not to be used to form joints, edges or for troweling the surface
  • Allow any and all bleed water to evaporate prior to finishing – do not sprinkle extra cement powder on the surface to soak up excess bleed water
  • Do not spray water on the surface to aid in finishing
  • Float surface prior to texturing and jointing
  • Texture to leave a non-slip surface (broom, burlap, float finish, etc.)

Curing For Strength & Durability

  • Minimum air temperature of 5°C for at least 72 hours following placement, or provide external heat to a maximum of 25°C (if heating externally protect from heat-loss shock when removing heat)
  • Protect from rapid moisture loss (evaporation retarders, poly, tarps, etc.) if hot or windy conditions exist

Proper techniques must be followed and can be found in CSA A23.1-09 for normal, cold and hot weather concreting.

DuraDrive®Information Sheet

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