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Influence of filler effect and pozzolanic reaction of biomass ashes on mechanical properties of cement mortars



Author(s): Vlastimir Radonjanin, Mirjana Malešev, Slobodan Šupić, Miroslava Radeka
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: 511-516
Total Pages: 6
Language : English


Abstract: The contribution of pozzolana in cement-based materials (concrete and mortar) can be categorized into: (i) physical or filler effect which is attributed by the fineness of the particles and (ii) chemical or pozzolanic effect which is attributed by the pozzolanic reaction. Various types of biomass, from agro-industrial processes, generate ashes through their combustion. These ashes, under certain conditions (chemical configuration, level of fineness), can have pozzolanic and/or filler activity in cementitious composites. In this study, the influence of filler effect and pozzolanic reaction of wheat straw ash (WSA), soya straw ash (SSA) and mixed soya and wheat straw ash (WSSA) was analysed. In the first phase pozzolanic activity and activity index of these ashes were tested and results have shown that SSA and WSSA have lower pozzolanic activity and activity index compared to wheat straw ash. That is why authors of this paper have tried to improve their filler effects by additional grinding in a lab ball mill. Filler effect was checked by testing of compressive strength of mortars in which 10 and 25% of cement was replaced with grinded ashes. Additional grinding had a positive impact on the activity index of WSSA, but in the case of SSA, it was close below the required value.


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


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