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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Sarah Scannell, Mike Lawrence and Pete Walker
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DOI:10.17265/1934-7359/2016.02.002
Affiliation(s)
Building Research Establishment Centre for Innovative Construction Materials, Department of Architecture and Civil Engineering, University of Bath, Bath BA2 7AY, UK
ABSTRACT
In recent years, the need
for low energy materials has become increasingly important. With government
targets aiming to reduce carbon emissions by 80% by 2050, and the construction
industry being responsible for 50% of the UK’s carbon emissions, it is of vital
importance that positive changes are made. One of these changes is to reduce
the carbon footprint of the materials used in construction. Lime mortar has
been used for centuries, but since the arrival of cement, its use in modern
construction has diminished, in part due to having lower compressive strengths
than cement mortar. Air lime mortar, in particular, can be categorised as low energy due to the
reabsorption of a significant amount of CO2 during the setting
process: carbonation. The current study focuses on the impact of different
types of aggregate (limestone and silicate) on air lime mortar strength.
Previous research has found that higher strengths can be achieved with the use
of limestone aggregate, but little is known about the reasons why. The research
presented here looks at a microstructural analysis through use of SEM (scanning electron
microscopy) in order to
determine reasons behind the strength differences. At early stages of curing,
there are clear differences at the interface of binder and aggregate.
KEYWORDS
Air lime, limestone, silicate aggregate, scanning electron microscopy, carbonation.
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