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May 17, 2013
Owner/developer: St. Martin’s Abbey
Project team: DLB Earthworks, general contractor; Jeffrey B. Glander, architect; SCJ Alliance, structural engineer; Allied Concrete Applicators, concrete contractor; Miles Sand & Gravel Co., ready-mix supplier
St. Martin’s University installed a 34,000-square-foot colored and stamped concrete courtyard at the abbey on its campus in Lacey.
Numerous challenges accompanied the project, such as maintaining color uniformity, keeping the mix design consistent throughout multiple pours, achieving slump and psi consistency, and dealing with weather.
Engineering specifications required that the decorative concrete could not exceed a 4-inch slump and must achieve 4,000 psi in 28 days. It was crucial that the mix design maintain a low water-to-cement ratio while using plasticizers and retarders for ease of stamping, and still achieve the required psi.
One reason for the strength requirement is that the courtyard must be accessible to emergency vehicles and fire department equipment.
The project started in June and finished in November. Weather conditions varied widely during that span, so consistency was a challenge. Drainage for the large site also had to be taken into account.