Often, cementitious or other rigid partial depth repair products are used to repair spalls in concrete pavements. The problem with these products is they can be brittle and can crack under direct heavy impact or because they have a different coefficient of expansion than the surrounding concrete. If the strength and the rate of expansion and contraction of the patching materials significantly differ from the material being repaired, inevitably one or both of the materials will fail. Conversely, asphaltic and other soft patching materials often lack the strength to hold up to direct traffic impact. Elastomeric concrete is a permanent solution because it has the ideal combination of strength and elasticity, even under bitterly cold conditions.
Elastomeric concrete is a two-part polyurethane patching material mixed with proprietary aggregates. It has been specified and installed on airport runways and highways since 1983. Some of the advantages of using elastomeric concrete are its high load-bearing capacity—it handles the weight of C-4s, 747s, and heavy truck traffic—and has outstanding antispalling properties. It also resists high impact and does not react with commonly used chemicals such as oil, fuel, and deicers. It is considered easy to install, and is flexible, allowing it to deflect as the surrounding concrete expands and contracts, rather than destroying the neighboring concrete.
Because of these properties, elastomeric concrete can be used to repair irregularly shaped areas; the patch does not need to be rectangular or square. Elastomeric concrete is self-leveling and has a rapid cure time, which is essential on runways. It has proven to be a strong, durable repair product that can even outlive the surrounding concrete.