Abstract
Summary In this paper a study of the behaviour of neat cement pastes and fresh cement mortars under shear in a rotational viscometer, especially designed for this purpose, is described. It is shown that a considerable structural breakdown occurs in the cement paste under the shearing action and a comparison between the results obtained from the viscometer and those associated with the compaction of concrete under vibration seems to suggest that a breakdown under shear does take place during the vibration of concrete. It is also shown that the rate of energy input to the paste is not constant, and the effect of this on the Vebe test is discussed. A method of measuring the workability of cement pastes and mortars is presented.
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