How moisture affects concrete?
Too much moisture, in addition to air pockets in your concrete flooring will leave you with a fragile surface. When there is more water in your concrete, it creates more space between the grains of the cement (an ingredient in the concrete). Increased levels of moisture will, without a doubt, reduce the strength and durability of your floor overtime. This happens because as the water makes those gaps bigger, they fill with air. These air pockets are what lead to fragility and instability in the concrete.
Just like any other time a pH balance is disturbed, the changing of the pH levels in your concrete can have some devastating effects. Humidity has a direct effect on the pH level in your concrete. If the humidity increases, so does your concrete’s pH and temperature. This isn’t necessarily bad but high temperatures can lead to a more porous surface- leading to problems over time. Plus, if the pH level in the concrete is too high, this is where we see adhesives fail. Additionally, acids from things like salt, cleaning agents, and other road chemicals can dissolve the aggregate in your concrete. Over time this will turn your concrete floor into a rocky, sand pit.
Last but certainly not least, if there is too much moisture in your concrete, you are going to end up with that horrible musty, mildewy smell. This occurs because, increased temperatures/ humidity + porous concrete = The ideal breeding grounds for mold, mildew, and bacteria. While it’s unlikely that your concrete will actually grow mold- due to the low amount of organic materials for mold to feed on- it does contain trapped pollen, dust, salts, etc. Those are all things that can fuel the growth of mold which comes with some subsequent reduction in the strength and integrity of the concrete not to mention, who wants to be breathing that in?