SYNTHESIS AND CHARACTERIZATION OF FLY ASH HYBRID CEMENTS WITH LIMESTONE

Author(s): G. Millán, J. González, L. Zamorano, A. Zaldívar, M. Figueroa
Paper category: Proceedings
Book title: ICBBM 2017 Proceedings of the 2nd International Conference on Bio-Based Building Materials
Editor(s): Sofiane AMZIANE and Mohammed SONEBI
e-ISBN: 978-2-35158-192-6
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 363-366
Total Pages: 4
Language : English

Abstract: In this work, the alkaline activation of hybrid fly ash cements with additions of up to 30% Portland cement and limestone activated with NaOH, Na2CO3, Na2SO4 and (COONa)2 is presented. Different activator modules (Na2O/SiO2) of 0.1 to 0.3 and a w/c ratio of 0.45. The results of the compression strengths tests at 28 days of curing in samples activated with Na2SO4 showed the highest strength, 31 MPa, with a weight proportion of fly ash: Portland cement: limestone of 60:30:10. The test cements with lower strength development were those activated with NaOH and (COONa)2 with 2.4 MPa and 7.4 MPa, respectively. The limestone particle could be observed by scanning electron microscopy as the nucleation center for the reaction products and the way that the fly ash reacted by means of the alkaline activation process to form part of the reaction products.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00