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CO2 SEQUESTRATION CAP ACITY OF REACTIVE MgO – PORTLAND CEMENT BINDER SYSTEMS AND A LIFE CYCLE ASSESSMENT CASE STUDY



Author(s): R. Zhang, A. Arrigoni, D.K. Panesar
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: 213-223
Total Pages: 11
Language : English


Abstract: Reactive MgO (r-MgO) is a promising alternative construction binder because of its capacity
to sequestrate CO2 during carbonation curing. However, the CO2 sequestration capacity of
binder systems containing both r-MgO and Portland cement (PC) has not been evaluated. This
study quantifies the CO2 absorbed during the accelerated carbonation of r-MgO-PC systems
with r-MgO replacement levels up to 90%. The results reveal that the mass of CO2 accounts
for more than 20% in the carbonated binder systems with r-MgO replacement ≥ 30%. The
quantity of CO2 stored in Mg carbonates increases as the r-MgO replacement level increases,
while the quantity of CO2 stored in Mg-calcite decreases. The global warming potential of
mortar products was assessed via life cycle assessment. The mortar with 50% PC and 50% r-
MgO exhibited a lower net greenhouse gas (GHG) emission and a lower net GHG emission
per unit of compressive strength than mortars with either 100% PC or 100% r-MgO.


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


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