Stiffening control of cement-based materials using accelerators in inline mixing processes: Possibilities and challenges

In many applications such as grouting, shotcrete, and 3D concrete printing, conflicting material requirements exist between the transportation and fabrication process, as fresh materials should be pumped easily with a low stiffening rate and a high fluidity while a rapid strength gain must occur aft...

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Bibliographic Details
Published in:Cement & concrete composites 2021-05, Vol.119, p.103972, Article 103972
Main Authors: Tao, Yaxin, Rahul, A.V., Lesage, Karel, Yuan, Yong, Van Tittelboom, Kim, De Schutter, Geert
Format: Article
Language:English
Subjects:
Accelerator
Cement-based materials
Hydration mechanism
Inline mixing
Stiffening control
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Summary:In many applications such as grouting, shotcrete, and 3D concrete printing, conflicting material requirements exist between the transportation and fabrication process, as fresh materials should be pumped easily with a low stiffening rate and a high fluidity while a rapid strength gain must occur after placement. In such applications, it is therefore imperative to achieve a stiffening control of the concrete. In this paper, we discuss how the inline mixing process of an accelerator post-pumping can be used to achieve this stiffening control. We begin with a review of the mechanisms of various commonly used accelerators. This is followed by a detailed discussion on the inline mixing process of accelerators. Finally, we also point out the problems and challenges of using accelerators in these applications.
ISSN:0958-9465
1873-393X
DOI:10.1016/j.cemconcomp.2021.103972