ATL SUPPORTS NYS REDI PROJECTS

ATL recently provided vibracore sediment sampling for the Ogdensburg City Front Channel Resiliency and Economic Development Initiative (REDI) project. The sediment samples were obtained utilizing one of ATL’s specially equipped sampling vessels and were later analyzed for environmental contaminants in support of the dredging phase.

Concrete Shrinkage and Cracks

I had a college professor that said concrete was guaranteed to do two things…harden and crack. Hardened concrete is the result of hydration, a chemical reaction between cement and water. The loss of water from the concrete as it cures results in a reduction in concrete volume, or shrinkage.

Hot Weather Concrete

The American Concrete Institute (ACI) defines ‘Hot Weather’ as high ambient temperatures, high concrete temperatures, low relative humidity, high wind speed, solar radiation, or any combination that will impair the quality of concrete due to accelerated moisture loss and/or cement hydration. Most summer days in New York State would qualify as ‘Hot Weather’, using ACI’s definition.

PCB in Caulk

Polychlorinated biphenyls (PCB) are a group of manmade chemicals that were introduced in the 1930’s due to their chemical stability, non-flammability, high boiling point, and insulating properties.