Cracks in the Concrete

Morrison-Maierle’s team, while working on the Billings-Logan International Airport’s terminal expansion project, noticed a white gel and sprawled cracking on the concrete apron. On a previous project, they also witnessed concrete exploding into several little rocks when they demolished an old concrete ramp. Under normal circumstances, concrete breaks into several large solid pieces when it’s demolished, not small rocks. These two incidents led Morrison-Maierle’s team to conduct further investigations as they suspected Alkali-Silica Reaction (ASR) was occurring at the airport.

While the team tested a concrete mixture with fly ash and lithium that mitigated the ASR problem, Morrison-Maierle developed a phasing schedule for the new airport aprons. They also poured additional concrete slabs for commercial aircraft use while they removed the ASR-impacted concrete.