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CO2 SEQUESTRATION POTENTIAL OF HIGH-VOLUME FLY ASH (HVFA) MORTAR WHEN BASED ON ACCELERATED CARBONATION TESTS



Author(s): P. Van den Heede, N. De Belie
Paper category: Proceedings
Book title: CO2STO2019 - International Workshop CO2 Storage in Concrete
Editor(s): Assia Djerbi, Othman Omikrine-Metalssi, Teddy Fen-Chong
ISBN:
e-ISBN: 978-2-35158-232-9
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 178-184
Total Pages: 07
Language : English


Abstract: The high carbonation susceptibility of binder systems with high volumes of supplementary
cementitious materials (SCMs) makes them more prone to steel reinforcement corrosion than
ordinary Portland cement (OPC) binder systems. However, in non-steel reinforced
applications, the low carbonation resistance could be a major advantage from the
environmental viewpoint since anthropogenic CO2 emissions are captured quite fast that way.
This would be an additional benefit to the low production related CO2 emissions of these
binders. If these materials would be applied on a sufficiently large scale this could reduce
global warming. In this paper, this CO2 sequestration potential was specifically investigated for
High-Volume Fly Ash (HVFA) mortar in which at least 50% of the binder consists of pozzolanic
fly ash from coal-fired electricity production. Phenolphthalein based natural and accelerated
carbonation data obtained at 0.04%, 1% and 10% CO2, as well as corresponding
thermogravimetric analysis (TGA) results were used to try to estimate the expected
carbonation rate and carbonation degree of HVFA mortar at the end of its service life and see
what CO2 uptake capacity would be reached by then. It was found that depending on the CO2
concentration applied during accelerated tests to estimate field carbonation rates and
carbonation degrees that are expected under realistic exposure conditions, the CO2
sequestration potential of HVFA binder systems within a timeframe of 100 years can vary
significantly. Carbonation tests conducted at 10% CO2 for this purpose tend to underestimate
the maximum CO2 uptake a lot more than carbonation tests at 1% CO2.


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


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