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The use of rheology in the study of the composition effects on the fresh behaviour of hydraulic lime grouts for injection of masonry walls

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Abstract

The injection of grouts inside multi-leaf stone masonries is a technique widely used for structural consolidation. To ensure an adequate flow of the grout inside the masonry, it is crucial to assure good fresh grout properties, such as good rheological behaviour. The scope of this paper is to provide preliminary indications and valuable data about the effects of specific hydraulic lime grout composition on their rheological behaviour with the purpose of a successful injection process. Through the use of rotational rheometer together with the Taguchi method, it was possible to study the influence of water/binder ratio, the type and dosage of superplasticizer and the partial replacement of hydraulic lime by silica fume, upon the grout rheological properties. The study leads to the conclusion that polycarboxylate-based superplasticizers present better performance from a rheological point of view than the naphthalene-based superplasticizer and that the water/binder ratio and superplasticizer dosage are the most determinant factors in the fresh grout rheological behaviour. On the other hand, silica fume dosage turned out to be the factor with the least contribution to improve the grout rheological behaviour compared to the other two factors reported in this study. The results summarised in this paper are part of a larger study and precede the analysis of the performance of those grouts when injected into different porous media that simulate old masonries.

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Acknowledgments

This paper is part of the research project PTDC/ECM/104376/2008, funded by FCT/MCTES, Portugal. The authors would like to acknowledge the hydraulic lime and the superplasticizers provided by Secil-Martingança and BASF-Construction Chemicals Portugal S.A, respectively, and the support from the strategic project PEst-C/CTM/LA0025/2011.

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Authors and Affiliations

  1. Department of Civil Engineering, Universidade Nova de Lisboa, Campus da Caparica, 2829-516, Caparica, Portugal

    Luis G. Baltazar, Fernando M.A. Henriques & Fernando Jorne

  2. Department of Materials and CENIMAT/I3N, Universidade Nova de Lisboa, Campus da Caparica, 2829-516, Caparica, Portugal

    Maria Teresa Cidade

Authors
  1. Luis G. Baltazar
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  2. Fernando M.A. Henriques
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  3. Fernando Jorne
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  4. Maria Teresa Cidade
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Correspondence to Maria Teresa Cidade.

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Baltazar, L.G., Henriques, F.M., Jorne, F. et al. The use of rheology in the study of the composition effects on the fresh behaviour of hydraulic lime grouts for injection of masonry walls. Rheol Acta 52, 127–138 (2013). https://doi.org/10.1007/s00397-013-0674-x

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  • DOI: https://doi.org/10.1007/s00397-013-0674-x

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