Required Tools and Materials
- DryPak General Purpose Concrete
- Timber planks for boxing
- Wooden float
- Bedding sand
- Screeding rail or heavy wooden plank
- Bucket (with measurements)
- Steel trowel (optional)
- Stiff bristled broom (optional)
- Grooving tool (optional)
- Edging tool (optional)
- Jointing tool (optional)
- Use the string to mark out the borders of your path.
- Dig out the area to a depth of approximately 150 mm.
- When excavating the area, it is important to form a slight slope away from buildings to allow the water run-off (allow a 20 mm drop for every metre).
- Place a layer of bedding sand about 50 mm deep into the excavated area.
- Using the timber planks and wooden stakes, box up the excavated area to the desired height of the path.
- If the area is subject to high traffic or heavy loads, reinforcing mesh may be required.
- Lightly spray the area to stop the concrete from losing moisture.
Mixing the Concrete
- Empty the bag of DryPak General Purpose Concrete into a wheelbarrow.
- Using the bucket, gradually add water (as per table below) and mix thoroughly.
- DO NOT add too much water - this will weaken the concrete.
at 50 mm
at 100 mm
at 150 mm
Placing the Concrete
- All concrete must be placed within 45 minutes of mixing.
- Using a shovel, place the concrete into the boxed area, slightly overfilling.
- Try to spread out the concrete as you go, lightly packing down the concrete with the shovel.
- Once the area is filled, use the screeding rail (or heavy wooden plank) to screed the concrete. Screeding is done by dragging a rail or plank across the surface of the concrete in a sawing motion to ensure a level surface is achieved.
Finishing the Concrete
- Once the concrete has been levelled, joints may need to be inserted to prevent cracking. Joints should be used for pathways and slabs larger than 4 m x 4 m.
- For a path, use the jointing tool to cut across the surface to a depth of 1/3 the thickness of the concrete, at intervals 1.5 times the width of the path.
- If needed, run the grooving tool over each joint to give it a smooth finish.
- Leave the concrete for 30 minutes, or until the surface water has disappeared, before you finish your concrete.
- Rub the wooden float over the surface to finish the concrete.
- You can now create one of the following textures for your slab:
- Smooth - use a steel trowel to obtain a shiny finish.
- Rough - gently drag a stiff bristled broom across the slab.
- Run the edging tool around the edges of the concrete to prevent chipping.
Curing the Concrete
- It is important to cure your concrete to obtain maximum strength.
- Curing is NOT setting. Setting is the concrete going hard. Curing is the concrete reaching its optimum strength.
- Cure your concrete for no less than a week before using it.
- Curing can be done using one of the following methods:
- Cover the concrete with a plastic sheet.
- Continually moisten the concrete with a fine mist spray.
- Cover the concrete with wet hessian.
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