Journal
CEMENT AND CONCRETE RESEARCH
Volume 54, Issue -, Pages 133-142Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2013.09.003
Keywords
Stability; Bleeding; Cement Paste; Solid Fraction; Sedimentation
Funding
- NTNU concrete lab
- COncrete Innovation Centre (COIN) at SINTEF
- NTNU
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Stability of cement paste was investigated by solid fraction (Phi) measurements and HYdroStatic Pressure Test (HYSPT). Phi over time was constant in the middle (homogeneous zone), increasing at the bottom (sediment) and with a transition layer between bleeding in pastes with SP. HYSPT indicates sedimentation and flocculation of fresh paste by the pressure gradient dp/dt Increasing Phi in limestone slurries and pastes without superplasticizer (SP) causes faster sedimentation. SP slows down particle movement by dispersion and producing less clear plateau pressure. Low SP dosage makes limestone slurries of varying Phi behave closer to Richardson-Zaki equation than pastes which need more SP for dispersion. Bio-polymer type VMA prolongs sedimentation only when combined with SP but induces more bleeding. At 40% limestone replacement (w/c increases from 0.5 to 0.835, w/p from 0.5 to 0.526 but Phi constant) SP stabilized slightly better at higher total SP content and w/c. (C) 2013 Elsevier Ltd. All rights reserved.
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