Friction Influence between Particles in the Behavior of Flow of Lime-Rendering Mortars
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 3
Abstract
The behavior and properties of rendering mortars, in the fresh state, are influenced primarily by particle grading, amount of water employed, and the shape and surface texture of particles. Production processes and application of rendering mortars demand an appropriate adjustment in their materials so that the plasticity and consistency need to be optimized allowing an appropriate execution of rendering. The friction between particles of sand is decisive in the rheological behavior of mortars. In this context, the present study evaluates the mortar flow behavior focusing on the influence of microfine content and grading of sands on friction angle of mortars. For experimental development, mortars that differ according to binder/aggregate ratios and aggregate grading distributions were used, in addition to using sands with different microfine contents. The mortar consistencies were established based on the cone penetration test. The mortars were tested to determine the internal friction angle using the direct shear test. The yield stress was obtained from the Vane test. The results indicate a relationship between the microfine content and the internal friction angle of the mortars, identifying a strong influences of friction under the behavior of flow of the rendering mortars.
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Acknowledgments
The authors would like to thank the following authorities:
•
The Testing Materials Laboratory of the University of Brasilia () for availability in carrying out the tests;
•
The National Council of Scientific and Technological Development (CNPq) for research aid and scholarship grants; and
•
The Higher Education Personnel Improvement Coordination (CAPES) for granting scholarships.
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 3 • March 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: May 1, 2013
Accepted: Feb 27, 2014
Published online: Jul 21, 2014
Discussion open until: Dec 21, 2014
Published in print: Mar 1, 2015
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