Cement is actually an ingredient to concrete. Concrete is the finished product of several aggregates and paste, forming a hard mixture that continues to harden for years even after the installation process. Even though the two terms can be used interchangeably, the reality is that cement is simply a component of concrete. Few other mixtures are as solid as a concrete foundation.
For the most part, a concrete slab will harden within twenty eight hours. As mentioned before, concrete will continue to harden for years after the installation process. However, it still won’t be strong enough for pedestrian foot traffic for about three days. The size of the concrete slab is also a factor. This means that it’s safe to recommend that you do not drive over a concrete structure for about a week, depending on how large the unit is. But it’s best to give a concrete driveway about a week to cure and harden.
Yes, mostly by the ratio of adding water and cement. The more cement you have, the stronger the structure will be. And the opposite is true. The more water added to the mixture, the weaker the unit will be. This is because the cement is the material that binds the aggregates together, and so it’s the main ingredient for strength.
For most homes, concrete will stand up against the elements and the test of time. In fact, most weather and materials have no effect on concrete at all, making it a solid choice for outdoor fixtures and home foundations. One of the few things that can actually damage concrete are acidic substances, ranging from light citrus to hydrochloric acid. So try not to place corrosive materials on top of a concrete unit.
There are several methods to use if this is the case. Firstly, see if the mark can be removed just using soap and water. If that fails, there are dry methods that can be applied. Most commonly sandblasting is a lucrative method by which to remove stains or discoloration. Failing that, there are also chemical methods that can be deployed.

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