Title:
Correlation between Paste and Concrete Flow Behavior
Author(s):
Julissa Hidalgo, Chun-Tao Chen, and Leslie J. Struble
Publication:
Materials Journal
Volume:
105
Issue:
3
Appears on pages(s):
281-288
Keywords:
cement paste; high-range water-reducing admixture; rheology; shear; slump; yield
DOI:
10.14359/19825
Date:
5/1/2008
Abstract:
The correlation between cement paste rheology and concrete workability in mixtures containing a polycarboxylated acrylate ester was initially seen as poor, in that the admixture dosage required to produce full dispersion in cement paste, as determined using dynamic rheology, was approximately four times the dosage required to produce full dispersion in concrete, as determined using slump and slump loss. A preshear protocol using a highspeed blender to reduce differences in shear history between cement paste and concrete provided a much improved correlation between paste rheology and concrete workability. Adsorption isotherms verified that both pastes and concretes were at full admixture saturation when fully dispersed.