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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Parallel-plate rotational rheometry of cement paste: Influence of the squeeze velocity during gap positioning

Full text
Author(s):
Cardoso, Fbio A. [1] ; Fujii, Alessandra L. [2] ; Pileggi, Rafael G. [1] ; Chaouche, Mohend [2]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Escola Politecn, Dept Construct Engn, BR-05508900 Sao Paulo - Brazil
[2] Ecole Normale Super, CNRS, Lab Mecan & Technol, F-94235 Cachan - France
Total Affiliations: 2
Document type: Journal article
Source: CEMENT AND CONCRETE RESEARCH; v. 75, p. 66-74, SEP 2015.
Web of Science Citations: 5
Abstract

This paper reports an experimental investigation regarding the influence of the squeeze velocity, during positioning of the parallel-plate gap, on the rotational shear flow behaviour of a cement paste. The descent of the upper plate was performed using diverse speeds while the normal force generated due to the compression of the paste was recorded. The slower the plate speed, the higher the resulting normal force. This behaviour was caused by liquid-solid separation, which is more likely to occur at slow squeeze velocities. Phase separation was confirmed by assessing, via microwave drying, the water contents of the trimmed portion of the paste sample and of the portion actually subjected to rotational shear cycles. Owing to the variation of water/cement ratio induced by liquid radial migration, paste's Bingham yield stress and plastic viscosity were significantly affected by squeeze speed, and both rheological parameters presented an inversely proportional relationship with this experimental variable. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 11/00948-9 - Phase separation in mortars: development of evaluation method and influence on rheological behavior
Grantee:Fábio Alonso Cardoso
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 12/18952-5 - Assessment of pressure distribution during Squeeze-flow of rendering mortars
Grantee:Rafael Giuliano Pileggi
Support Opportunities: Regular Research Grants
FAPESP's process: 13/27121-2 - Squeeze-flow and phase segregation in mortars: influence of paste viscosity and particle size distribution
Grantee:Fábio Alonso Cardoso
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor