New insights into water dynamics of Portland cement paste with nano-additives using quasielastic neutron scattering
- 335 Downloads
Early-age hydration kinetics of Portland cement with nano-additives such as nano-silica (NS) was examined using quasielastic neutron scattering (QENS). Cement pastes with different ratios of Portland cement to NS were prepared. The concentration of the NS played a major role in controlling the free and bound water during the hydration of the cement paste. Additionally, the effects of metakaolin (MK) with NS in Portland cements revealed that MK acts as a retarder by decreasing the bounding water capacity during the early age of hydration. An increase in the concentration of NS affected the degree of hydration by reducing the amount of free and mobile water in the gel pores when compared to Portland cement paste. Here, we show that the concentration of NS governs the early-age hydration process in Portland cements.
We thank the “Kuwait Foundation for the Advancement of Sciences” and “Kuwait-MIT Center for Natural Resources and the Environment” for their support during this work. The identification of any commercial product or trade name does not imply endorsement or recommendation by the National Institute of Standards and Technology (NIST). We acknowledge fruitful discussions with Dr. Andrew Allen from NIST.
- 2.Jamsheer AF, Kupwade-Patil K, Büyüköztürk O, Bumajdad A (2018) Analysis of engineered cement paste using silica nanoparticles and metakaolin using 29Si NMR, water adsorption and synchrotron X-ray Diffraction. Constr Build Mater 180:698–709. https://doi.org/10.1016/j.conbuildmat.2018.05.272 CrossRefGoogle Scholar
- 11.Biernacki JJ, Bullard JW, Sant G, Brown K, Glasser Fredrik P, Jones S, Ley T, Livingston R, Nicoleau L, Olek J, Sanchez F, Shahsavari R, Stutzman PE, Sobolev K, Prater T (2017) Cements in the 21st century: challenges, perspectives, and opportunities. J Am Ceram Soc 100(7):2746–2773. https://doi.org/10.1111/jace.14948 CrossRefGoogle Scholar
- 12.Thomas JJ, FitzGerald SA, Neumann DA, Livingston RA (2001) State of water in hydrating tricalcium silicate and portland cement pastes as measured by quasi-elastic neutron scattering. J Am Ceram Soc 84(8):1811–1816. https://doi.org/10.1111/j.1151-2916.2001.tb00919.x CrossRefGoogle Scholar
- 13.Kupwade-Patil K, Tyagi M, Brown CM, Büyüköztürk O (2016) Water dynamics in cement paste at early age prepared with pozzolanic volcanic ash and Ordinary Portland Cement using quasielastic neutron scattering. Cem Concr Res 86:55–62. https://doi.org/10.1016/j.cemconres.2016.04.011 CrossRefGoogle Scholar
- 16.Peterson V (2010) Studying the hydration of cement systems in real-time using quasielastic and inelastic neutron scattering. In: Eckold G, Schober H, Nagler SE (eds) Studying kinetics with neutrons, Springer series in solid-state sciences, vol 161. Springer, Berlin, pp 19–75. https://doi.org/10.1007/978-3-642-03309-4_2 Google Scholar
- 22.Berliner R, Popovici M, Herwig KW, Berliner M, Jennings HM, Thomas JJ (1998) Quasielastic neutron scattering study of the effect of water-to-cement ratio on the hydration kinetics of tricalcium silicate. Cem Concr Res 28(2):231–243. https://doi.org/10.1016/S0008-8846(97)00260-3 CrossRefGoogle Scholar
- 26.Egami T, Billinge SJL (2012) Underneath the Bragg peaks: structural analysis of complex materials. Elsevier Science, AmsterdamGoogle Scholar