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Drying concrete faster after rain is tricky because you’d need to increase the temperature or airflow over your slab, both of which are challenging to do outdoors. It can help to remove water from your concrete quickly, though, as the faster you remove rain from the surface, the lower the risk of the water affecting the ratio of your concrete mix. Use squeegees or mops to remove water, and consider covering your slab with a tarp to protect it from future rainfall.

Use a dehumidifier for indoor concrete and a wet vacuum for outdoor surfaces. Sprinkle absorbent materials like sawdust or cat litter to soak up the remaining moisture. If the concrete is outside, simply wait for a few hot, dry days. If the concrete is inside, make sure you have good ventilation for a few days so that any remaining moisture can completely dry out.

Yes, adding water to concrete will increase its slump, so you should do so with caution. Always measure the slump of the concrete batch before you adjust it, and be sure not to add too much and push the slump too high. Doing so can cause the aggregate to separate, set inconsistently, or shrink.

You don't technically need rebar for a concrete patio, but it's a good idea to install it, especially if your patio will support any heavy items. All concrete is susceptible to cracking, and rebar keeps cracks in check while maintaining a smooth, level surface. Without rebar, cracks will likely widen and cause the concrete to become uneven, compromising its structural integrity.