Produção Nacional
Revisado por pares
Influence of spraying on the early hydration of accelerated cement pastes
2016; Elsevier BV; Volume: 88; Linguagem: Inglês
10.1016/j.cemconres.2016.06.005
ISSN1873-3948
AutoresRenan P. Salvador, Sérgio Cavalaro, Miguel Cano, Antônio Domingues de Figueiredo,
Tópico(s)Drilling and Well Engineering
ResumoIn practice, most of the studies about the interaction between cement and accelerators is performed with hand-mixed pastes. However, in many applications mixing occurs through spraying, which may affect accelerators reactivity and the microstructure of the hardened paste. The objective of this study is to analyze how the mixing process influences the early hydration of accelerated cement pastes. Isothermal calorimetry, X-ray diffraction, thermogravimetry and SEM imaging were performed on cement pastes produced by hand-mixing and by spraying, using equivalent doses of an alkali-free and an alkaline accelerator and two types of cement. Results showed a great influence of the spraying process on the reactivity of accelerators and on the morphology of the precipitated hydrates. Variations in hydration kinetics caused by the mixing method are explained and the results obtained might have a significant repercussion on how future research on the behavior of accelerated mixes will be performed.
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