Abstract
In order to reduce the use of sodium silicate solutions and hydroxides for the alkaline activation of materials, the combination of alkaline activators has a positive effect to produce alternative cements with environmental advantages in relation to Portland cement-based materials. This research report results of compressive strength and reaction products of blast-furnace slag cements activated with a mixture of MgO-Na2SO4 with a ratio 1:1 added in 4, 6 and 8% relative to the slag weight. Pastes of alkali activated slag were prepared and cured at 20 ℃ and 60 ℃-24h-20 ℃ up to 90 days. Samples at 20 ℃ did not show a strength gain during the first 3 days of curing, but after 7 days the strength increased noticeably of up 53 MPa at 90 days. It also was observed that curing at 60 ℃ favored a gain of compressive strength at early ages between 20-30MPa with a marginal increase at 90 days. The use of the mix MgO-Na2SO4 was favorable for the chemical activation of the slag without detrimental effects on the stability of the formulated samples. The microstructures consisted of C-S-H, ettringite, hydrotalcite and some traces of CaCO3 from the raw material.
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Acknowledgements
The Technological National of Mexico (TecNM) and the National Council of Science and Technology (Conacyt) are acknowledged for the financial support of the project 5609.15-P and for the scholarship (711629) to I. Betancourt-Castillo, respectively.
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Betancourt-Castillo, I.E., Díaz-Guillén, J.A., Escalante-García, J.I., Burciaga-Díaz, O. (2023). One Part Blast-Furnace Slag Cements Activated with a Blend of MgO-Na2SO4. In: Escalante-Garcia, J.I., Castro Borges, P., Duran-Herrera, A. (eds) Proceedings of the 75th RILEM Annual Week 2021. RW 2021. RILEM Bookseries, vol 40. Springer, Cham. https://doi.org/10.1007/978-3-031-21735-7_69
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