If the concrete slab is casted and just after rain starting for the next 2-3 hours, what will we doing after stops raining ?

This is a very crucial problem on the construction site, usually a civil or site engineer plan the date of casting by using Weather Forecast.

There are two methods to prevent the casted concrete site from ruined

1. Use Tarpaulin Sheet before the rain.
2. And after the rain, you can apply a mixture of cement and water to the ruined concreted area.