Ternary binder made from coal combustion products: mechanical properties and microstructure evolution

Author(s): Vít Šmilauer, Rostislav Šulc, Pavel Reiterman, Petr Hlaváček, Martina Šídlová, František Škvára, Adéla Peterová, Roman Snop
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials, Systems and Structures (SMSS2019) New Generation of Construction Materials
Editor(s): Marijana Serdar, Nina Štirmer, John Provis
ISBN: 978-2-35158-217-6,
Vol 1. ISBN: 978-2-35158-223-7
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 431-438
Total Pages: 8
Language : English

Abstract: Coal combustion products present industrially interesting source of aluminosilicate materials. Based on previous experience, a ternary binder is proposed, consisting of circulating fluidized bed combustion (CFBC) fly ash, conventional fly ash and Ca(OH)2 activator. The binder yields reasonable compressive strength of 32 MPa after 28 days of standard sealed curing and can be used for soil stabilization or concrete production.
Volumetric evolution of crystalline and amorphous phases during hydration were quantified using XRD analysis, differential thermal gravimetry, porosimetry and electron microscopy. A micromechanical model is applied to interpret the evolution of compressive strength due to the growing proportions of C-S-H and ettringite in the system. Long-term
monitoring of the binder showed excellent volume stability and no detrimental expansion due to late ettringite formation.

Online publication : 2019
Publication type : full_text
Public price (Euros) : 0.00