This paper, which reports on part of a three-year research project into wet-process sprayed concrete for repair, examines the influence of rheology on the pumping and sprayign of mortars. The performance of sever commer- cially available prepackaged repair mortars and six laboratory-designed fine mortars was examined using the Tattersall two-point and Viskomat rotational viscometers, The pressure bleed test, the slump test, a build test and a Vane shear strength test, These tests were used to form a rheological audit of each mortar. The two-point apparatus Was successful with low-workabiligy mortars, and their flow resistance and torque viscosities were determined. These parameters were also obtained with the Viskomat, although problems were encountered owing to the low Workability of the mortars.
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