For the Duration

by Christina Plunkett, Public Relations Dir.; United States Army Corps of Engineers, Jacksonville (FL) District,

Serial Information: Civil Engineering—ASCE, 1999, Vol. 69, Issue 9, Pg. 46-47

Document Type: Feature article


The U.S. Army Corps of Engineers developed a new grouting method called duration grouting when constructing the foundations for the Portugues Dam in Ponce, Puerto Rico. The site is marked by a steep grade and a varied, fractured strata. To support the forces generated by water pressures on the dam, the Corps had to conduct intensive surveys and find a way to fill tiny cracks throughout the rock that would sit below the dam. They created a method using a mix of Portland cement and microfine cement, varying the mixture as conditions dictated. They pumped the mixture at different pressures to make sure it reached the required depths.

Subject Headings: Water pressure | Rockfill dams | Mixtures | Grouting | Dam foundations | Cracking | Soil surveys

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