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Title: Effect of rate of lifting of slump cone in indicated slump of concrete
Authors: United States. Army. Office of the Chief of Engineers.
Wilson, Hugh K.
Stowe, Richard L.
Keywords: Concrete tests
Slump cones
Slump tests (concrete)
Publisher: Concrete Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; C-71-7.
Description: Miscellaneous paper
Abstract: Tests were conducted using a mechanical device for lifting a slump cone at various lifting rates. Four sets of randomly chosen lift times up to and including 10 sec were used to test :four batches each of nominal I-, J-, and 6-ih.-slump concretes. Three batches of nominal 5-1/2-in.-slump concrete were tested using sequence lift times of three permutations of 1, 5, and 10 sec. All mixtures were proportioned using 1-1/2-in. maximum-size limestone aggregate, 6.2 bags of cement per cubic yard, and 3 oz of molasses as a retarder. The results showed that lapsed time (i.e ' time after water was added to the mixture) had more effect on the measured slump of the 1-, 3-, and 6-in.-clump concrete than did randomized time of cone lift. The results of sequence lift time tests showed a slightly significant difference in slump due to time of cone lift, the difference being between the slump occurring for a 1-sec lift time and that occurring for a 5-sec lift time. For nominal 5-1/2-in.-slump concrete, the slump test should be performed as soon as is added to the mixture using a possible after water cone lift time of 5 -+ 3 sec.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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