Portal de Periódicos da CAPES

Artigo Produção Nacional Revisado por pares

BIBTEX RIS

Effect of the nanosilica source on the rheology and early-age hydration of calcium sulfoaluminate cement pastes

2022; Elsevier BV; Volume: 327; Linguagem: Inglês

10.1016/j.conbuildmat.2022.126942

1879-0526

Luís Urbano Durlo Tambara Júnior, Paulo Ricardo de Matos, Geannina Terezinha dos Santos Lima, Laura Silvestro, Janaíde Cavalcante Rocha, Carlos Eduardo Maduro de Campos, Philippe Jean Paul Gleize,

Innovative concrete reinforcement materials

This work investigates the role of different nanosilica (NS) sources on the rheology and early-age hydration of calcium sulfoaluminate (CSA) cement paste. Specifically, pastes were produced with three NS (two powder and one colloidal suspension) in 1 wt% replacement of cement, with and without superplasticizer. Rotational rheometry, isothermal calorimetry, and in-situ X-ray diffraction (XRD) tests were conducted. The results showed that incorporation NS increased the yield while decreased the viscosity and delayed the shear thickening onset point of CSA pastes, regardless of the NS source. Calorimetry and in-situ XRD revealed that NS incorporation enhanced the CSA cement hydration kinetics while superplasticizer delayed it. Overall, colloidal NS led to the best overall early-age performance, leading to the lowest viscosity and the highest hydration degree over time among the CSA cement pastes investigated.