SMALL SCALE FRACTURE PROPERTIES OF CEMENT PASTE AND ALKALI-ACTIVATED FLY ASH

Author(s): J. Němeček (1), J. Němečková (1), J. Němeček (1), J. Maňák (2)
Paper category: Proceedings
Book title: SynerCrete’18 International Conference on Interdisciplinary Approaches for Cement-based Materials and Structural Concrete
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: 779-784
Total Pages: 6
Language : English

Abstract: The paper shows novel methodology and quantitative results of small scale elastic and fracture properties of cement paste and alkali-activated fly ash constituents at the level of micrometers. Local Young's moduli, tensile strengths and fracture energies are derived from nanoindentation and micro-beam bending on microscale specimens prepared with focused ion beam milling. It is shown that the main cement hydration products (inner and outer products) that are rich of C-S-H gel reach tensile strength of 260-700 MPa. N-A-S-H gel in alkali-activated fly ash is characterized with the mean strength of 340 MPa. The values are several orders of magnitude higher compared to their macroscopic counterparts. Supremum fracture energies were found in the range 4-20 J/m2
on individual microstructural components.

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