Abstract
Accurate characterisation of static yield stress evolution with time enables correct evaluation of the structural build-up rate for cement-based materials. This parameter is fundamentally important for many construction processes, including conventional in-situ concrete construction, various digital fabrication techniques, well cementing, etc. The paper at hand presents a parameter study on determination of structural build-up by means of constant shear rate test. It is shown, how the choice of single or multiple samples as well as different constant shear rates and pre-shear regimes influences the apparent time-dependent static yield stress evolution of cementitious materials and, hence, the accuracy of structural build-up rate evaluation. Respective recommendations for decreasing error in measurements of static yield stress are provided.
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Acknowledgements
This work is a part of I. Ivanova’s PhD research. The project is funded by German Research Foundation (DFG) within the priority program SPP 2005 Opus Fluidum Futurum – Rheology of reactive, multiscale, multiphase construction materials. The authors also express sincere gratitude to HeidelbergCement AG for providing Portland cement used in this study.
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Ivanova, I., Mechtcherine, V. (2020). Evaluation of Structural Build-Up Rate of Cementitious Materials by Means of Constant Shear Rate Test: Parameter Study. 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_25
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DOI: https://doi.org/10.1007/978-3-030-22566-7_25
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