Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 235, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.117744
Keywords
Cement paste; Static yield stress; Dynamic yield stress; Lignosulfonates; Polycarboxylates
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The influence of water/cement (w/c) ratio, and type and concentration of two chemical additives, lignosulfonate and polycarboxylate, on the static (SYS) and dynamic (DYS) yield stresses of Portland cement paste was studied. Large differences between both magnitudes express the existence of, at least, two different microstructural levels. This information is relevant for the design in concrete applications. Specifically, it was found that larger differences between the microstructures that characterize both yield stress values were obtained when (w/c) ratio decreased and the amount of the plasticizers increased. With the empirical functions that were proposed for these dependencies, the calculation of the hydraulic power of a positive displacement pump was made. Results indicate that higher pumping power is required for cement pastes with lower w/c ratios and low polycarboxylic additive content, and when lower w/c ratio is combined with high amount of lignosulfonate additive. (C) 2019 Elsevier Ltd. All rights reserved.
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