Acceleration of OPC by CAC in binary and ternary systems: The role of pore solution chemistry

Journal article
(Original article)


Publication Details

Author(s): Nehring J, Neubauer J, Berger S, Götz-Neunhoeffer F
Journal: Cement and Concrete Research
Publisher: Elsevier Ltd
Publication year: 2018
Volume: 107
Pages range: 264-274
ISSN: 0008-8846


Abstract

In dry-mortar-formulations calcium aluminate cement (CAC) is often used as a set accelerator for ordinary Portland cement (OPC). However, a critical amount of CAC is able to delay not only the silicate reaction but also the renewed C3A dissolution of an OPC. This delay can be counteracted by adding an appropriate amount of calcium sulfate (C$) to the mix OPC/CAC. The initial hydration period is dominated by fast ettringite formation from CA (CAC) and CaSO4 from OPC generating early strength. High aluminum and low calcium concentrations in the pore solution probably hinder C-S-H seeding and precipitation, thus preventing alite dissolution. Aluminum has to be initially removed by precipitating hydrate phases to change the pore solution chemistry. The start of the silicate reaction is then induced by increasing the calcium concentration in the pore solution.


FAU Authors / FAU Editors

Götz-Neunhoeffer, Friedlinde Prof. Dr.
Lehrstuhl für Mineralogie
Nehring, Jörg
Lehrstuhl für Mineralogie
Neubauer, Jürgen apl. Prof. Dr.
Lehrstuhl für Mineralogie


External institutions
Kerneos S.A.


How to cite

APA:
Nehring, J., Neubauer, J., Berger, S., & Götz-Neunhoeffer, F. (2018). Acceleration of OPC by CAC in binary and ternary systems: The role of pore solution chemistry. Cement and Concrete Research, 107, 264-274. https://dx.doi.org/10.1016/j.cemconres.2018.02.012

MLA:
Nehring, Jörg, et al. "Acceleration of OPC by CAC in binary and ternary systems: The role of pore solution chemistry." Cement and Concrete Research 107 (2018): 264-274.

BibTeX: 

Last updated on 2018-20-12 at 11:54