The result is a concrete surface that is pitted and with flakey layers. But the most serious consequence could be surface scaling, particularly if it was pounding rain. They might include dusting off the surface, an unsealed surface that will allow for more water to be absorbed, and a reduced ability of the slab to resist cracking due to freeze-thaw cycles if the slab is exposed to the elements. You would be left with a weakened surface and problems in the future. If it was not covered before the rain started, if the concrete hadn’t hardened, and if there was enough rain falling with enough force, the rain may have washed some of the cement out of the concrete. The most common problem you may be faced with is the effect the rain may have had on the surface of the concrete. Make visual inspection for any obvious damage or defects, one way to check if the slab is relatively hard is to use a scratch test, use a tool like a screwdriver to test the surface hardness. How to assess the damage to a concrete slab after a heavy rainstorm. and never spread dry cement onto the surface in an attempt to soak up any excess rainwater. On the other hand, if you were to get a sudden thunderstorm or heavy rain and have nothing to cover it then let the rain pass and push or pull the surface water off and continue to smooth or finish the concrete slab.ĭon’t work the rainwater into the slab this will the water-cement ratio this will create a non-durable surface that could be susceptible to crazing and dusting. If your slab has had 2-4 hours to harden before it starts raining there should be little or no effect on the concretes surface but it is important to just leave the rainwater on the surface and not try to work it into the concrete. How to reinforce a concrete slab using steel reinforcing bars and welded mesh.How do I fix cracks in a concrete slab?.Can I pour concrete over an existing rain-damaged concrete slab will it bond together?.How to get a great looking and easy care floor for my garage.What can I do to fix a rain-damaged concrete slab?.How to assess the damage to a concrete slab after a heavy rainstorm.
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