Concrete genie black birches1/31/2024 ![]() Like with calcium chloride, the best thing to do to protect your concrete is to find an alternative to these salts, but if you do need to use them you should always test the salts on a dedicated testing spot to make sure they won’t be doing any damage.įortunately, the spots caused by de-icing salts can be cleaned off with just a little elbow grease. These oils can seep into the concrete and cause dark spots to emerge. The problem with these isn’t the salts themselves, but the oils that end up attached to the salts during processing. While it is very good for getting rid of dangerous ice, it is also very bad for your concrete. Unfortunately for us, it is a major factor in a lot of instances of discoloration. Calcium ChlorideĬalcium chloride is a particular kind of de-icing salt that is often used over concrete. Slag concrete tends to have a lighter color than usual, making discoloration all the more noticeable. It has many similar properties to the cement usually used in concrete, which makes it a fairly effective replacement. Slag is a byproduct of refining iron and steel. Instead, it will turn a slight brown tinge. This cement replacement can often cause concrete to take on color, but it won’t usually turn the concrete black. This isn’t usually used on its own, rather, it’s usually mixed with about 20% portland cement. The most common of these are Fly Ash and Slag.įly Ash is a byproduct of coal power plants. Using A Cement ReplacementĬement is terrible for the environment, so many people and companies will mix their concrete using a different binding agent. However, nobody can avoid mistakes 100% of the time. Most of them are being pretty careful to make sure that this particular mistake doesn’t happen. Fortunately, this is something that you can control pretty easily. ![]() Just like water content can be a major factor in whether your concrete finishes uniformly, different kinds of cement can also take on different colors when all is said and done. As a result, there isn’t really much that you can do to prevent this from happening. This means that if whoever mixed the concrete needed to mix two different batches and the second batch had a different amount of water than the first, one of the two batches will end up darker than the other.įor most large-scale projects, this means that the fault lands squarely on the shoulders of the ready-mix company from which you ordered your concrete. During the curing process, this cement can take on different colors depending on the mix’s water content. Inconsistent MixingĪ lot of what gives concrete its color is the cement that’s used in its production. There are many possible causes for discoloration in concrete, and in many situations, it can be near impossible to tell which one applies to your slab. How to Remove Black Stains From Concrete What Causes Concrete Discoloration?.
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