In situ measurement of the rheological properties and agglomeration on cementitious pastes

Various factors influence the rheology of cementitious pastes, with the most important being the mixing protocol, mixture proportions, and mixture composition. This study investigated the influence of ground-granulated blast-furnace slag, on the rheological behavior of cementitious pastes. In tandem...

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Bibliographic Details
Published in:Journal of rheology (New York : 1978) 2016-07, Vol.60 (4), p.695-704
Main Authors: Kim, Jae Hong, Yim, Hong Jae, Ferron, Raissa Douglas
Format: Article
Language:English
Subjects:
AGGLOMERATION
BACKSCATTERING
BLAST FURNACES
CAPILLARIES
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COMPUTERIZED SIMULATION
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DIFFRACTION
FLOCCULATION
LASERS
MICROSTRUCTURE
MIXING
MIXTURES
PORTLAND CEMENT
RHEOLOGY
SLAGS
SUSPENSIONS
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Summary:Various factors influence the rheology of cementitious pastes, with the most important being the mixing protocol, mixture proportions, and mixture composition. This study investigated the influence of ground-granulated blast-furnace slag, on the rheological behavior of cementitious pastes. In tandem with the rheological measurements, fresh state microstructural measurements were conducted using three different techniques: A coupled stroboscope-rheometer, a coupled laser backscattering-rheometer, and a conventional laser diffraction technique. Laser diffraction and the coupled stroboscope-rheometer were not good measures of the in situ state of flocculation of a sample. Rather, only the laser backscattering technique allowed for in situ measurement on a highly concentrated suspension (cementitious paste). Using the coupled laser backscattering-rheometer technique, a link between the particle system and rheological behavior was determined through a modeling approach that takes into account agglomeration properties. A higher degree of agglomeration was seen in the ordinary Portland cement paste than pastes containing the slag and this was related to the degree of capillary pressure in the paste systems.
ISSN:0148-6055
1520-8516
DOI:10.1122/1.4954251