Concrete curing in warmer weather

As Canberra heads into warmer weather, builders and concreters should plan how fresh concrete will be protected from rapid moisture loss. Hot weather can shorten working times, while direct sunlight, dry winds and low humidity increase evaporation and the risk of early cracking.

These conditions can affect slabs, driveways and paths even when air temperatures are relatively mild. Curing needs to retain moisture so concrete can continue developing strength and durability.

Good warm weather concreting practices include:

• Checking temperature, wind and humidity forecasts, and scheduling pours for the cooler part of the day where practical.
• Coordinating deliveries, labour and equipment to avoid delays. Discuss suitable mixes and any retarding admixtures with the concrete supplier before the pour.
• Wetting dry subbases and formwork before placement without leaving standing water.
• Avoiding unapproved water additions to the mix.
• Using a suitable evaporation retarder during placing and finishing, in accordance with the manufacturer’s instructions.
• Starting curing promptly after final finishing. Use suitable curing compounds, secured plastic sheeting or wet coverings, with the timing and method selected to avoid damaging the fresh surface.
• Maintaining effective curing for the specified period. Keep wet coverings continuously moist, protect slab edges, and check that covers remain secure.
• Checking curing compound compatibility with later waterproofing, tiling adhesives and coatings, including any required removal or surface preparation.

Evaporation retarders, including aliphatic alcohol, do not replace curing. Concrete still requires an appropriate curing method once finishing is complete.

Agree the curing method and duration before the pour, based on the project specification, concrete mix and supplier’s recommendations. Keep a record of the curing measures used as part of your site quality checks.

If you have any questions or need further guidance, please don’t hesitate to contact our Advisory team:

📞 (02) 6175 5900
📧 workplace@mba.org.au