Potential USE of ash from the paper industry as SCM

Author(s): Sabina Kramar, Vilma Ducman
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: 456-462
Total Pages: 7
Language : English

Abstract: The study investigates the potential of use of ash from paper industry in mortars. For that purpose the influence of 5%, 10% and 20% substitution of cement with two different ashes (K4-fly ash from co-combustion of coal, bark, biomass and/or paper sludge, and K5-mixture of bottom ash and fly ash from co-combustion of paper sludge) on mortar properties was studied. Properties of fresh mixtures and hardened mortars were assessed using various methods. Among fresh properties workability and setting time were investigated. The evolution of compressive and flexural strength of hardened mortars was studied thought test performed at 7, 28, 56, 180 and 365 days. Furthermore durability properties of mortars with addition of ash were determined. Results showed that by higher replacement level the workability was in general enhanced while initial and final setting times were prolongated. In a hardened state the addition of ash decreases early age and long term compressive strength of the mortars.. However, bond strength of mortars can be considerably increased, by applying K4 or K5. While frost resistance is higher in case of K5 ash, mixtures with K4 showed better sulfate resistance and resistance to carbonation.

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

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