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(Surface flaking; see illustration above) Concrete pavers are made with high strength concrete.The resulting hydraulic pressures can exceed the strength limits of the concrete, causing pitting and/or scaling.The greater the number of freeze/thaw cycles water goes through within concrete, the greater the potential for concrete damage.This means lower strength concrete will absorb more water than higher strength concrete.Lower strength concrete=greater water absorption=more water freezing and expanding in the slab=greater probability to scale.Calcium chloride pellets are the fastest acting deicer at all temperatures down to -25ºF.Rock salt provides adequate, economical performance at temperatures at or just below 32ºF.

This action normally increases the number of freeze/thaw cycles that water goes through, which in turn can increase the potential for concrete scaling.

Each time water in concrete freezes, it expands approximately 9%.

As temperatures drop below freezing, rock salt’s ice-melting performance slows substantially which can cause freeze-induced expansion pressures by increasing the number of freeze/thaw cycles.

The strength of concrete and the porosity of concrete are directly related.

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What effect does a common chemical deicer have on concrete surfaces?

It is widely known that deicers containing ammonium nitrate and/or ammonium sulfate will chemically attack concrete.

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