Construction Joint Clean-Up Method at Shasta Dam


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Title: Construction Joint Clean-Up Method at Shasta Dam

Author(s): C. S. Rippon

Publication: Journal Proceedings

Volume: 40


Appears on pages(s): 293-304


Date: 2/1/1944

Specifications for Shasta Dam and Power Plant on the Sacramento River near Redding, Calif., incorporated a new method for treatment of horizontal construction joints. The method required a 2-in. cov- ering of moist sand spread on the concrete as soon as the surface had hardened sufficiently to withstand the necessary traffic. Clean-up required before the placement of the next concrete lift consisted of removing the wet sand, which also served as a curing medium, and washing with high velocity air-water jets. This method was abandoned after 9 months’ operation because of high cost of handling the sand and interruption of concrete placement schedules by use of hi-lines to distribute sand. After abandoning the sand method, all joints were cured with water sprays and wet sand blasted just prior to placement of the next concrete lift.