Hard Working Construction Labour Working in Heaven Rain | Concrete Work During Heavy Rain @engineeringcivilstudy
Before you start the pour, ensure that any cavities are free from water, and keep them covered as much as possible. If it started raining before you could cover the slab, don't panic. Simply wait until the rain has passed, then pull or push any surface water off the edge of the slab surface before finishing
We can’t always trust the weather forecast! A sudden downpour of rain is enough to make even the most experienced building contractor rethink pouring concrete.
As ready mix concrete suppliers in London, we’re all too familiar with unpredictable weather conditions when pouring concrete, but there are ways to protect your project from excess water successfully.
Read on to find out how to protect concrete from rain.
HOW DOES RAIN AFFECT CONCRETE?
Rain falling on top of freshly laid concrete can damage the surface and compromise a level and floated finish. Even worse, if too much extra water works its way into the concrete mix, it can alter the carefully proportioned water-cement ratio, disrupt the curing process and result in weak concrete overall – every concrete contractor’s nightmare.
For this reason, it’s important when pouring concrete in the rain to never lay the concrete onto wet surfaces or trenches filled with water if there’s a risk that the water may mix into the concrete.
The concrete mixture can often displace the rain water, pushing it upwards and out of the cavity into rainwater pools. Don’t try to ‘soak up’ the rain water with the concrete or dry cement, or work it into a freshly laid surface as this excess water will compromise the concrete mix and diminish the top layer.
How rainwater will affect concrete depends on the stage in the curing and pouring process that was reached before the rain set in. If the concrete is still fresh (around 2-4 hours after pouring), it’s important to cover the surface to protect it.
How long does concrete take to dry after rain?
Once the concrete has been finished (between 4-8 hours after pouring) and has set hard enough for walking on, the effects of rain should be minimal. The curing process is a chemical reaction, with ready mix concrete taking up to 28 days to fully cure. However, as long as you let your fresh concrete cure under waterproof covers with good drainage for a minimum of 4-8 hours, this should be sufficient to prevent damage.
Commercial concrete services from Master Mix Concrete
The Master Mix Concrete team on a rainy construction site
HOW CAN I PROTECT CONCRETE WHEN IT RAINS?
If bad weather is forecast or you’re pouring concrete in the rain, your first step should be to ensure the work site is properly covered with a plastic sheet covering. It’s worth keeping the necessary equipment to hand as a precaution during the rainy season. Protect small slabs from rainwater using plastic sheeting, or use temporary shelters made with large tarps and timber to ensure rainwater doesn’t damage bigger areas.
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