Rapid Set Concrete

Easy Mix Rapid Set Concrete is a premixed, bagged product containing accurately weighed Portland cement, graded coarse and fine aggregates and quality admixtures. It also incorporates a non-chloride accelerator which ensures a far more rapid setting time when compared with standard concrete.

Because of its fast setting qualities, Easy Mix Rapid Set Concrete is ideal for pergola posts, footings, embedding playground equipment and all other applications where a rapid setting concrete is required.

Please note: Due to its rapid setting qualities, Rapid Set Concrete is not suitable for slabs or jobs that require a smooth surface finish.

Post hole size (rule of thumb)

Width = 2x width or diameter of the post
(100mm x 100mm post requires a 200mm x 200mm hole)

Depth = 1/3 of the length of the post
(2m post length requires hole depth of 600mm.)

Note: Some structures may need formal approval – see local council for details.


Dry method

  1. Prepare post holes and brace the posts in position.
  2. Thoroughly wet the hole so that the hole does not soak up the water required for the Easy Mix Rapid Set Concrete mix.
  3. Add the required amount of Easy Mix Rapid Set Concrete into the hole around the post. Do Not Mix. Ensure the post is level.
  4. Pour the water required on top of the concrete. 1 x 20kg bag requires approximately 2 litres of water (add approximately 1 litre of water for every 10kg of Rapid Set Concrete).
  5. Allow to cure for two hours before continuing with the next construction stage.

Wet method – best for structural projects

  1. Prepare post holes and brace the posts in position.
  2. Mix Easy Mix Rapid Set with water as per instructions on the back of bag in a barrow or on a board. A stiffer, drier mix is best.
  3. Place the wet mixture into the hole around the post. Tamp the mix to make sure it is level and firm.
  4. Wash all equipment immediately as this product will harden rapidly.
  5. Allow to harden for 15 minutes before proceeding to the next stage of the project.


Easy Mix Rapid Set Concrete will keep for up to six months if kept in a dry environment, off the ground and providing the bags remain sealed. High temperature and high humidity conditions may reduce the storage life of the product.

Easy Mix Rapid Set Concrete contains cement powders which can be harmful to the skin. During use, avoid inhalation of dust and contact with the skin and eyes. Wear suitable clothing, gloves, eye protection and respiratory protective equipment.

If contact with the skin occurs, thoroughly clean the area with plenty of fresh water and soap. In case of contact with the eyes rinse with plenty of fresh water and seek medical advice. If swallowed, seek medical attention immediately. Do not induce vomiting.

Download the Safety Data Sheet and read the product label carefully before use.

Download Technical Data Sheet

Available in weather resistant water proof packaging in Bunnings throughout Queensland.


Suggested Applications
  • Pergola posts
  • Installation of stirups
  • Fence posts
  • Signs
  • Footings


Coverage Rates

Each 20kg bag contains approximately 10 litres of Rapid Set Concrete.

  • 1x 10kg Bag = 0.0005m³
  • 200x 10kg Bags = 1.0m³
  • 1x 20kg Bag = 0.01m³
  • 100x 20kg Bags = 1.0m³
  • 1x 30kg Bag = 0.0151m³
  • 66x 30kg Bags = 1.0m³

Note: Use approximately two 20kg bags of Rapid Set Concrete per post hole.


Easy Mix Rapid Set Concrete is available in:

  • 10kg bags
  • 20kg bags
  • 30kg bags