D-Cracking (Deterioration of the Aggregate Within the Concrete)
Problem: D-Cracking is the result of placing the concrete slab over a surface that has poor drainage capability. This problem happens when there is not have enough gravel base for the driveway or in areas where water is trapped by the concrete and does not have adequate drainage. You see this frequently near flower beds or plantings where water is used for the plants but it has no way to completely drain. The concrete slab is subject to continuous humidity combined with freeze/thaw cycles that break down the cell walls inside of the concrete slab from the bottom up.
D-Cracking is usually found near the edge of the concrete where it meets with the lawn, landscape or street curb or near open driveway control joints or driveway crack joints or cracks in the slab. It shows up initially as a webbing of small spidery cracks on the surface of the concrete. It can look like lace or veins which are more obvious when humidity is present.
This webbing spreads and the cracks will start to open and separate. Eventually the concrete will crumble to gravel in the area affected by D-Cracking. Patching the damaged areas is only a temporary solution. Eventually the complete slab will turn into gravel.
Solution: There is no product available today that will stop the problem completely as it begins at the bottom of the concrete and works upward. Eventually the section of slab will need to be replaced. However, this deterioration process has been proven to slow down when the concrete is treated with SealGreen Penetrating Concrete Sealer. SealGreen Concrete Sealer is a siliconate-based sealer that works inside the pores of the concrete, creating a gel that permanently bonds to the concrete as it dries. This bonding action can seal hairline cracks, significantly reduces water penetration which reduces the damage caused by the many freeze-thaw cycles of a typical winter. It helps slow down the deterioration of the concrete allowing you to get a few more years of use out of your concrete driveway, walkway, parking lot, etc.