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Alkali Activation of High Mgo Bfs with Sodiumcarbonate Added Dry Vs. Wet
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. University of Babylon/ Iraq.ORCID iD: 0000-0002-5328-4073
2019 (English)In: Proceedings of theInternational Conference on Sustainable Materials, Systems and Structures (SMSS2019): New Generation ofConstruction Materials / [ed] Marjana Serdar, Nina Štirmer, John Provis, Rovini / Croatia 20-22 March 2019, 2019, Vol. Pro128, p. 354-361, article id session 8Conference paper, Published paper (Other (popular science, discussion, etc.))
Abstract [en]

The use of sodium carbonate to alkali activate blast furnace slag has several advantages over

the typically used sodium silicate, including for example easier, safer handling and less negative environmental impacts. In this study, sodium carbonate (SC)-activated blast furnace slag (BFS) pastes and concretes were produced using a high MgO content BFS activated with 3, 5, 10 and 14 wt.% (by binder) of SC. The activator was added either as a dry powder or dissolved in water one hour before mixing. The setting time, workability and compressive strength after 1,7 and 28 days were determined. Concrete cubes were cured in two setups: sealed specimens at 65 ˚C for 24 hours followed by storage at laboratory conditions (20±2˚C), or simply sealed storage at laboratory conditions (20±2˚C and 50-55% RH), until testing. The results showed that, increasing the dosage of SC decreases the initial and the final setting time regardless of whether the mixing procedure was dry or wet. However, addition of the SC dissolved in water increased the slump at higher SC dosage, while increasing addition of the dry SC resulted in a lower slump. A higher dose of SC increased the 28d compressive strength when added as a dry powder

or wet, with higher values in laboratory curing compared with heat curing.

Place, publisher, year, edition, pages
Rovini / Croatia 20-22 March 2019, 2019. Vol. Pro128, p. 354-361, article id session 8
Series
International Conference on Sustainable Materials, Systems and Structures (SMSS 2019) New Generation of Construction Materials
Keywords [en]
Alkali Activated Slag, Blast Furnace Slag, Alkali activation, Sodium carbonate.
National Category
Engineering and Technology
Research subject
Building Materials
Identifiers
URN: urn:nbn:se:ltu:diva-76113ISBN: 978-2-35158-218-3 (electronic)ISBN: 978-2-35158-217-6 (print)ISBN: 978-2-35158-223-7 (print)OAI: oai:DiVA.org:ltu-76113DiVA, id: diva2:1354600
Conference
RILEM -International Conference on Sustainable Materials, Systems and Structures SMSS 2019/ in Croatia
Funder
Luleå University of Technology, 143103Luleå University of TechnologyAvailable from: 2019-09-25 Created: 2019-09-25 Last updated: 2019-11-22

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