MCR sprayed rheology paper.pdf (103.52 kB)
The rheological performance of wet-process sprayed mortars
journal contribution
posted on 2008-11-26, 12:44 authored by Simon Austin, Peter Robins, Chris GoodierChris GoodierThis 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 spraying of mortars. The
performance of seven commercially available pre-packaged 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-workability mortars and their flow resistance and torque viscosities were determined. These
parameters were also obtained with the Viskomat, although problems were encountered due to their
low workability. The pressure bleed test measured both the rate and the total volume of liquid emitted
from the mixes whilst the vane shear strength test provided an instantaneous reading of the shear
strength of the mortars and is compared with their slump. The mortars were pumped and sprayed
through a worm pump to assess their suitability and to measure their adhesion to a substrate by build
thickness. This value is a measure of sprayability and is converted into values of maximum shear and
bending stress which are then compared with the workability parameters in order to determine their
inter-relationship.
History
School
- Architecture, Building and Civil Engineering
Citation
AUSTIN, S.A., ROBINS, P.J. and GOODIER, C.I., 1999. The rheological performance of wet-process sprayed mortars. Magazine of Concrete Research, 51 (5), pp. 341-352Publisher
© Institution of Civil Engineers / Thomas TelfordVersion
- NA (Not Applicable or Unknown)
Publication date
1999Notes
This article was published in the journal, Magazine of Concrete Research, and the definitive version is available from: http://www.thomastelford.com/journals/ISSN
0024-9831;1751-763XLanguage
- en