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Aspects of activated fly ash: a comparative study of different mechanical treatments



Author(s): Alexander Mezhov, Ursula Pott, Dietmar Stephan, Konstantin Kovler
Paper category: Proceedings
Book title: SynerCrete’18: Interdisciplinary Approaches for Cement-based Materials and Structural Concrete: Synergizing Expertise and Bridging Scales of Space and Time Vol. 1 & 2
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 105-110
Total Pages: 6
Language : English


Abstract: The paper presents a new type of blended binder consisting of Ordinary Portland Cement and mechanochemically activated Fly Ash. The activation was performed by means of three different types of mill: vibratory ball mill, vibratory disc mill and planetary ball mill, in presence of anionic surfactant and without it. Activation was performed until the same surface area was achieved for all the samples regardless of the mill type. The structure of fly ash was characterized by X-ray diffraction and scanning electron microscopy. The properties of blended binder were examined by rheological measurements. It was found that introduction of surfactant in the mill allows to decrease yield stress and viscosity of blended binder up to 45% and 40%, respectively, in comparison to conventional introduction of surfactant. Hydration of blended binder was characterized by ultrasonic measurement and shows predictable retardation effect, that is commonly known for anionic surfactants. Blended binder prepared with fly ash interground with surfactant show higher strength than fly ash activated apart of surfactant.


Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00


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