Concrete peeling and chipping is a common problem that can be caused by a variety of factors, including environmental conditions, poor installation, and incorrect mixing. To prevent concrete from flaking, it is important to understand the chemistry behind the concrete and use the right techniques when pouring and finishing it. Sealing the concrete with a waterproof sealant is the best way to prevent moisture-related chipping. Additionally, using air-dragged concrete, applying a water-repellent sealant, and using silicate sealants can help reduce the risk of concrete peeling.
Sealing is the most effective way to prevent chipping. For new concrete, apply a penetrating waterproofing sealant 28 days after the concrete is laid and every few years thereafter. This will help keep moisture out of the concrete and reduce the risk of rusting rebar or improper joint construction. When pouring concrete, it is important to use just the right amount of water.
Too much water can weaken the concrete, so use a reliable paddle mixer to ensure that the mixture is as dry as possible. Additionally, give the concrete time to cure correctly. Coating the finished surface with a waterproof seal approximately one month after concrete placement can help prevent water shedding. Applying a water-repellent sealant is also a great solution for concrete peeling, as it reduces water absorption by up to 95%.
Silicate sealants can be used in combination with water-repellent sealants for increased strength and decreased water absorption. First apply a silicate densifier, followed by a silane siloxane water repellent sealant 5 to 7 days later. When ordering your concrete, be sure to tell the batching plant whether or not the platform will be outside or inside. Most rolling mix plants should be aware of the need to introduce air, but don't hesitate to ask about it either.
You can also get a concrete tester on site to test for settlement and drop. To prevent weather-related chipping, use air-blown concrete, cure well, and apply a water-repellent sealant after the slab has cured. During cold days, water freezes inside the concrete and forms snow or ice, which expands and causes the concrete to break. It is also important to ensure that new binder material has the same properties as existing concrete. In conclusion, sealing is the best way to prevent chipping in new concrete. Additionally, using air-dragged concrete, applying a water-repellent sealant, and using silicate sealants can help reduce the risk of concrete peeling.