Accession Number : AD0606208

Title :   FIELD TESTS OF WATER-REDUCING, SET-RETARDING ADMIXTURES IN MASS CONCRETE AT GLEN CANYON AND FLAMING GORGE DAMS: -COLORADO RIVER STORAGE PROJECT,

Corporate Author : BUREAU OF RECLAMATION DENVER COLO

Personal Author(s) : Richards,J. D.

Report Date : 15 JUN 1964

Pagination or Media Count : 32

Abstract : Tests were conducted at Glen Canyon and Flaming Gorge Dams to determine any advantages to be gained through the use of lingnin-type, water-reducing, set-retarding agents/WRA/ in mass concrete. At both projects a control mix with normal cementitious-material content was compared to mixes in which the cementitious-materialcx7gxnt was reduced 5 to 10 percent or the cobble content was reduced 10 percent with the use of a WRA. Conclusions were-- (1) The 180-day compressive strength of concretes containing a WRA was 20 to 26 percent greater than the control concretes. In some cases the 1-day strength of the WRA concretes was less than the control concrete. (2) With a 5 percent reduction in cement plus pozzolan content the WRA reduced the water requirement 5.4 percent at Flaming Gorge and 10.9 percent at Glen Canyon. (3) The addition of a WRA produced a 3- to 9hous increase in time to reach initial set in mortar. (4) Use of the WRA did not increase the rate of slump and air loss in the concretes. (Author)

Descriptors :   (*DAMS, CONCRETE), (*CONCRETE, REINFORCING MATERIALS), ENVIRONMENTAL TESTS, WATER SUPPLIES, COMPRESSIVE PROPERTIES, ELASTIC PROPERTIES, CREEP, MIXTURES, CEMENTS, LIGNIN, COSTS, ADDITIVES, CIVIL ENGINEERING, COLORADO

Distribution Statement : APPROVED FOR PUBLIC RELEASE