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,

Descriptive Note:

Corporate Author:

BUREAU OF RECLAMATION DENVER COLO

Personal Author(s):

Report Date:

1964-06-15

Pagination or Media Count:

32.0

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 agentsWRA 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

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE