Abstract
Special applications like pumping, spraying or printing of concrete require the precise adjustment of very specific rheological properties at different time steps during the casting process. Superplasticizers such as polycarboxylate ethers (PCE) can be used to obtain the required flowability, which, possibly in combination with additional rheology modifying admixtures, generate the required specified consistency. However, after the application, the concrete should change the rheological properties immediately in order to avoid deformations at rest. Therefore, the use of accelerators can be effective. Accelerators influence the hydration of cementitious materials, and thus the rheological properties over the course of time and the setting.
In this paper, the influence of different accelerators on the rheology and early hydration of cement paste as well as the interaction of accelerator and PCE are presented. Methods like rheometry, needle penetration tests and practical tests like spread flow were applied. The used accelerators showed accelerating behavior on the cement pastes without and in the presence of PCE. At the same time an influence on the rheology could be observed. This effect was less in the mixes with PCE, especially at the highest water/cement ratio (w/c).
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Acknowledgement
The author would like to thank the funding from German Research Association (DFG) for the project program Opus Fluidum Futurum – Rheology of reactive, multiscale, multiphase construction materials (SPP 2005) (Project number 387092747) and the supply of cement and superplasticizer from HeidelbergCement and BASF, respectively.
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Leinitz, S., Lu, Z., Becker, S., Stephan, D., von Klitzing, R., Schmidt, W. (2020). Influence of Different Accelerators on the Rheology and Early Hydration of Cement Paste. In: Mechtcherine, V., Khayat, K., Secrieru, E. (eds) Rheology and Processing of Construction Materials. RheoCon SCC 2019 2019. RILEM Bookseries, vol 23. Springer, Cham. https://doi.org/10.1007/978-3-030-22566-7_13
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DOI: https://doi.org/10.1007/978-3-030-22566-7_13
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