Workability, shear strength and build of wet-process sprayed mortars
conference contributionposted on 10.07.2009, 15:27 by Simon Austin, Peter Robins, Chris Goodier
This paper, which reports on part of a three year research project into wetprocess sprayed concrete for repair, examines the influence of rheology on the pumping and spraying of sprayed mortars. The workability properties of seven commercially available prepackaged repair mortars and six laboratory designed fine mortars were examined using the Tattersall Two-point viscometer, the slump test, a build test and a vane shear strength test. The Two-point apparatus was successful with low-workability mortars and the flow resistance and torque viscosity of the mortars was determined. The vane shear strength test provided an instantaneous reading of the shear strength of the mortars and is compared with their slump. The build value, a measure of sprayability, is then compared with these two workability parameters and the flow resistance in order to determine their inter-relationship.
- Architecture, Building and Civil Engineering