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Rheologie du beton frais remanie. III - L'essai au cone d'Abrams modifie. [Rheology of Disturbed Fresh Concrete. Part 3. The Modified Slump Cone Test.]


pdf icon Rheologie du beton frais remanie. III - L'essai au cone d'Abrams modifie. [Rheology of Disturbed Fresh Concrete. Part 3. The Modified Slump Cone Test.] (748 K)
deLarrard, F.; Ferraris, C. F.

Bulletin des Laboratoies des Ponts et Chaussees, Vol. 215, 53-60, May/June 1998.

Keywords:

rheology; concretes; viscosity

Abstract:

[ABSTRACT IN ENGLIGH] This third paper describes the development of a simple worksite test intended to evaluate the two Bingham characteristics. The principle is to measure the time taken for the upper surface of the concrete sample, placed in an slump cone, to slump by 10 cm. Details of the experimental setup and method are given and an analysis is performed of the results of the test on the 78 mixes in the programme. Semi-empirical models are suggested for the shear threshold and the plastic viscosity. The test can be used to evaluate the viscosity of concretes whose slump is between 12 and 26 cm. If in the future the validity of the modified slump cone test is confirmed it could provide a valuable supplement to the BTRHEOM rheometer test, being used for day-to-day quality control with the rheometer reserved for mix design or investigating critical cases.