The effects of seeding C3S pastes with afwillite

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Title: The effects of seeding C3S pastes with afwillite
Authors: Horgnies, M
Chen, J
Fei, L
Arroyo, R
Gartner, EM
Item Type: Journal Article
Abstract: The addition of 1–4% s/s (dry solids by mass of C3S) of afwillite (C3S2H3) seeds to C3S pastes made with two different commercial polyacrylate-based superplasticizers (SP) allows the pastes to be cast at low water/C3S mass ratios (w/c) and overcomes the hydration retardation produced by the SPs. SP-free C3S pastes seeded with afwillite at an initial w/c of 0.50 gave about 30% lower 28-day compressive strengths than the unseeded controls, due to higher porosities. However, at w/c = 0.35, with the addition of 0.4% s/s SP, the afwillite-seeded pastes gave similar or higher strengths than the unseeded controls at all ages tested. Hydration rate data obtained by chemical shrinkage measurements suggest that this is because the degrees of hydration of the C3S in the low w/c afwillite-seeded pastes made with added SP reach higher values than in the unseeded controls, compensating for the difference in density of the hydrates.
Issue Date: 30-Aug-2016
Date of Acceptance: 22-Aug-2016
URI: http://hdl.handle.net/10044/1/39598
DOI: https://dx.doi.org/10.1016/j.cemconres.2016.08.015
ISSN: 0008-8846
Publisher: Elsevier
Start Page: 145
End Page: 157
Journal / Book Title: Cement and Concrete Research
Volume: 89
Copyright Statement: © 2016 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Science & Technology
Technology
Construction & Building Technology
Materials Science, Multidisciplinary
Materials Science
Hydration products (B)
Microstructure (B)
Shrinkage (C)
Ca3SiO5 (D)
Seeding
TRICALCIUM SILICATE PASTES
HYDRATED CALCIUM SILICATES
PORTLAND-CEMENT
MICROSTRUCTURE
200-DEGREES-C
TEMPERATURE
SHRINKAGE
PRESSURE
Building & Construction
0905 Civil Engineering
1202 Building
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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