At times, a concrete contractor might find there is a problem which they cannot fix. However, no matter the problem, a concrete contractor can offer concrete restoration once they understand the cause. If there is curing compound on the surface, a concrete contractor can complete a concrete repair when they remove it using a chemical cleaner. Sometimes the surface will need to be sanded again. If a liquid hardener was applied, you need to sand or grind the surface to get beneath the hardener.
If the surface is hand-troweled, then you will need to create access to the calcium hydroxide which is located within the concrete. This can be done through sanding the surface or grinding the surface. If you find that the decorative concrete has low alkaline content, then you should consider the use of non-reactive stains or the use of a spray micro-topping for the surface. If the patches will not take the stain, there is really no manner in which to fix it. You should test the patch materials prior to using them because there are instances when the polymer contained in the patch materials will not allow the stain to penetrate. If you are covering the slab with materials which are non-absorptive such as cure paper, plywood, plastic, masonite, or drywall piles, you should prepare the owner and ensure that the covering is not allowed to stay on long, but only during the time when the mess is being created. The floors should be stained and sealed one day before other trades are allowed to work on them.
If the surface is hand-troweled, then you will need to create access to the calcium hydroxide which is located within the concrete. This can be done through sanding the surface or grinding the surface. If you find that the decorative concrete has low alkaline content, then you should consider the use of non-reactive stains or the use of a spray micro-topping for the surface. If the patches will not take the stain, there is really no manner in which to fix it. You should test the patch materials prior to using them because there are instances when the polymer contained in the patch materials will not allow the stain to penetrate. If you are covering the slab with materials which are non-absorptive such as cure paper, plywood, plastic, masonite, or drywall piles, you should prepare the owner and ensure that the covering is not allowed to stay on long, but only during the time when the mess is being created. The floors should be stained and sealed one day before other trades are allowed to work on them.