Journal
CEMENT & CONCRETE COMPOSITES
Volume 84, Issue -, Pages 188-197Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2017.09.005
Keywords
Na2CO3 activation; Isothermal calorimetry; Reaction kinetics; Reaction products; Microstructure; Compressive strength
Funding
- China Scholarship Council (CSC)
- Department of the Built Environment at Eindhoven University of Technology
- Building Materials research group at TU Eindhoven: Rijkswaterstaat Grote Projecten en Onderhoud
- Graniet-Import Benelux
- Kijlstra Betonmortel
- Struyk Verwo
- Attero
- Enci
- Rijkswaterstaat Zee en Delta - District Noord
- Van Gansewinkel Minerals
- BTE
- V.d. Bosch Beton
- Selor
- GMB
- Icopal
- BN International
- Eltomation
- Knauf Gips
- Hess AAC Systems
- Kronos
- Joma
- CRH Europe Sustainable Concrete Centre
- CementBetonCentrum
- Heros
- Inashco
- Keim
- Sirius International
- Boskalis
- NNERGY
- Tata Steel
- Millvision
- Sappi
- Studio Roex
- Van Berlo Groep
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This study aims to investigate the time-dependent characteristics of sodium carbonate activated slag at the early stage and its compressive strength development. The reaction kinetics of Na2CO3 activated slag is analyzed at the curing ages of 1h, 6h, 1d, 2d, 3d, 4d and 7d, respectively, and the reaction products are characterized employing FTIR, XRD, TG-DTG and SEM. The results show that a weak reflection of gay-lussite is observed after 1 d of curing, while intensive accumulation of gaylussite and formation of hydrotalcite are observed at 2 d/3 d. Meanwhile, the gelation of C-(A)-S-H after 3 d of curing is identified by FTIR. The role of pH, CO32- anion concentration and the formation of crystals such as gaylussite and hydrotalcite on the reaction process are discussed. In addition, a relationship between the initial alkali concentration and compressive strength at different curing ages of 7 d, 28 d and 180 d is derived. (C) 2017 Elsevier Ltd. All rights reserved.
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