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Of all the products on the market today for ice removal on concrete driveways, rock salt may be one of the worst choices. This is especially true when used on concrete driveways that have not been properly poured.
When poured properly, concrete is a fantastic material. It is durable, long lasting and affordable. However, the life of your concrete driveway can be significantly reduced if inappropriate chemicals — even salt — are used on it.
Concrete gets its strength from its compression; it is “squeezed” together to become strong but the compression also can be its biggest weakness. When concrete is exposed to pressure or great tension, it becomes weak — this is the weakness rock salt takes advantage of.
Concrete absorbs water, which you may have noticed if you have ever poured water onto it and notice watched it disappear. The water is absorbed by the tiny pores of the surface and eventually seeps out the bottom. However, when you add salt to the mixture, it may spell trouble for your concrete driveway.
Rock salt melts snow and ice, resulting in a salt and water mush, if you will. The mush is then slowly absorbed into the concrete driveway where it will freeze again rather than drain out the other side. When the water freezes, it expands and can cause fractures in the concrete leading to weak spots, cracks, breaks and what may appear to be small potholes on the surface.
Rock salt is also hygroscopic, meaning it attracts water, and causes concrete to become more saturated with water than if just exposed to rain or melting snow without salt. In fact, water’s volume increase by approximately 9 percent by the time it freezes inside the concrete driveway. The added pressure from the expanding water — which obviously turns into ice crystals—often causes the surface of the concrete to break apart.
Contact the landscaping and driveway experts at Green Acres Landscaping and Masonry for a professional assessment of your concrete driveway. Serving all of Northern Virginia including Alexandria, Annandale, Arlington, Newington, Oakton and Reston since 1992, we pride ourselves in excellent customer service and outstanding products.
Green Acres Landscaping is a full service landscape design company, serving both residential and commercial clients in the Northern Virginia area since 1992. Our experienced team is ready to help you with any landscaping project, large or small.