Effect of amine functionalized nanosilica on the cement hydration and on the physical-mechanical properties of Portland
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TECHNOLOGY AND APPLICATION
Effect of amine functionalized nanosilica on the cement hydration and on the physical-mechanical properties of Portland cement pastes Julliana Simas Vasconcellos & Gabriel Lima Oliveira Martins & Gerlon de Almeida Ribeiro Oliveira & Luciano Morais Lião & João Henrique da Silva Rêgo & Patrícia Pomme Confessori Sartoratto
Received: 17 December 2019 / Accepted: 1 July 2020 # Springer Nature B.V. 2020
Abstract In recent years, due to the rapid development of nanotechnology and the desire for breakthroughs in cementitious materials, there has been a strong research focus on the application of nanoparticles as supplementary cementitious materials (SCM) such as nanosilica (NS). This paper investigates the effect of functionalized nanosilica (NSF) with amino groups on Portland cement pastes. Fourier transform infrared (FTIR) spectroscopy, 29 Si nuclear magnetic resonance (NMR), thermogravimetric analysis (TGA), and transmission electron microscopy (TEM) assays were performed to characterize the NSF and confirm the grafting of the amine organic groups on the nanosilica surface (NS). Samples of cement masses were prepared containing NSF or NS with varying content of 0.3, 0.9 and 2.7% by weight, a reference sample of cement mass was also prepared This article is part of the topical collection: Categorization of Nanomaterials Guest Editors: John Rumble, Paolo Milani, Betul HekimogluBalkan, and Kenneth A. Dawson J. S. Vasconcellos (*) : G. L. O. Martins (*) : J. H. da Silva Rêgo Postgraduate Program in Structural Engineering and Construction, University of Brasília, Campus Universitário Darcy Ribeiro, 70910-900 Brasília, DF, Brazil e-mail: [email protected] e-mail: [email protected] G. de Almeida Ribeiro Oliveira : L. M. Lião : P. P. C. Sartoratto Chemistry Institute, Goiás Federal University, Campus Samambaia, Goiânia, Goiás 74001-970, Brazil
without any addition. For the characterization of cement pastes, induction calorimetry, mercury intrusion porosimetry, and compressive strength tests were performed. The results showed that NSF samples led to reduced superplasticizer use and decreased hydration rate and that the 0.9% NSF sample achieved compressive strength at 28 days greater than 50 MPa. Keywords Nanoparticles . Nanosilica . Chemical synthesis . Functionalized nanosilica
Introduction In the last years, there is a concern of society with the creation, integration, and strengthening of studies in the areas of nanotechnology and sustainability, areas that are active in the frontier of knowledge for the development of new nanomaterials, with a huge scientific interest in the application of nanoparticles in cementitious materials. Among all nanoparticles, nanosilica (NS) is the most suitable for the production of cement-based materials due to its amorphous structure, high purity, and high specific surface area (Chithra et al. 2016). The addition of NS to Portland cement produces a pozzolanic reaction that results in an increase in the mean length of the hydrated calcium silica
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