Evaluation of admixtures for use in concrete to be placed underwater
Tynes, W. O. (William O.)
Technical reportAbstract: Concrete without admixture and concrete containing either a plasticizer ("fluidifier") or a retarder were mixed and deposited underwater using the tremie method. The tremie used consisted of a pipe topped with a receiving funnel and plugged at the discharge end to keep the pipe sealed until filled with concrete. Tests were conducted with a number of batches of concrete to determine the slope and distance the concrete flowed. The tests were made to determine if these commercially available admixtures when used in concrete to be placed underwater increase the flowability of the concrete. Test results indicated that the use of either a retarding admixture or a plasticizer did not increase the flowability of equal-slump concrete, regardless of point of tremie discharge. The slope was not significantly affected by either a retarding admixture or a plasticizer. The concrete containing either a retarder or plasticizer appeared to be more cohesive and developed less laitance than equal-slump concrete without these admixtures.
Concrete Laboratory (U.S.)Engineer Research and Development Center (U.S.)
Admixtures; Concrete placing; Tremie concrete; Underwater construction
Technical report (U.S. Army Engineer Waterways Experiment Station) ; C-76-3.
Approved for public release; distribution is unlimited.