A1 Journal article (refereed), original research

Environmental and economic perspective of waste-derived activators on alkali-activated mortars


Open Access hybrid publication

Publication Details
Authors: Abdulkareem Mariam, Havukainen Jouni, Nuortila-Jokinen Jutta, Horttanainen Mika
Publisher: Elsevier
Publication year: 2020
Language: English
Related Journal or Series Information: Journal of Cleaner Production
Journal acronym: JCP
ISSN: 0959-6526
eISSN: 1879-1786
JUFO-Level of this publication: 2
Open Access: Open Access hybrid publication
Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe2020112092263

Abstract

Alkali-activated binders have been considered a low carbon alternative
to cement and are produced by reacting aluminosilicate precursor with an
alkali-activator. However, alkali-activators have been observed to be a
major contributor to the environmental burdens of alkali-activated
materials regarding various environmental impact categories. Therefore,
this study aims to perform an environmental impact assessment using life
cycle assessment methodology on alkali-activated mortars produced from
chemically modified one- and two-part waste-derived activators (waste
glass and rice husk ash) in comparison to conventional one- and two-part
alkali-activated mortars, to estimate the influence of activator on
environmental impact of mortar. Additionally, a simplified cost analysis
of the different mortar compositions was conducted. A sensitivity
analysis was performed on the key parameters, and allocating emissions
to waste glass and rice husk ash. Results show that waste glass and rice
husk ash-derived alkali-activated mortar resulted in up to 62%, 61%,
76% and 56% reduced emission respectively in climate change, fossil
depletion, terrestrial acidification and photochemical ozone creation
formation when compared to conventional alkali-activated mortar
counterpart. Sensitivity analysis indicated that waste glass and rice
husk ash are not so sensitive to mass allocation, with a maximum of 5%
increased emissions observed in the above-mentioned impact categories.
Additionally, sensitivity analysis on sodium hydroxide demonstrated that
production from chlorine-alkali electrolysis using technology-mix
produced improved environmental performance in comparison to production
from brine solution and diaphragm route, respectively. Sensitivity
analysis on sodium silicate using an alternative inventory data
indicated the emissions can increase regarding one-part or decrease
regarding two-part alkali-activated mortars. Results from cost analysis
indicated up to 19% cost savings from waste-derived alkali-activated
mortar compared to conventional alkali-activated mortar. In conclusion,
chemically modified waste-derived activators are a promising alternative
in improving environmental performance of alkali-activated materials if
their usage also reduces or substitutes the need for conventional
alkali-activators.


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Urban infra revolution (01/11/2017 - 31/10/2020)

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Last updated on 2020-30-11 at 10:45