A two-mile stretch of airport access road rebuilt with a concrete mix containing portland limestone cement (PLC) and 20% fly ash will be honored next month with the 2015 Triad Award. Sponsored by cement supplier Holcim (US) Inc., the program recognizes owner-contractor-supplier teams that deliver sustainable public projects.
It was inevitable that a road carrying 72,000 vehicles a day since the early 1990s would reach the point of diminishing returns vis-à-vis maintenance and repairs. The only road in and out of Denver International Airport, Pena Boulevard had developed a severe case of alkali silica reactivity (ASR).
A mix that contains 5% to 15% limestone, PLC has a smaller carbon footprint than ordinary portland cement (OPC) because it requires less energy to produce. Since adopting a “green concrete” specification in 2008 that allows for PLC, the Colorado DOT has placed more than 300 lane miles of PLC pavement. Placement and performance are virtually identical and, in some cases (particularly freeze-thaw and salt scaling resistance), better than OPC.
Attendees must register for both the luncheon ($94) and World of Concrete (WOC) BUT government employees pay only $20 (a $65 discount) on WOC registration if they register through the American Concrete Institute’s website: https://www.compusystems.com/servlet/ar?evt_uid=238&site=&PromoCode=A21&&.
We hope to see you there!