TY - JOUR
T1 - Mechanical behavior of textile reinforced alkali-activated mortar based on fly ash, metakaolin and ladle furnace slag
AU - Arce, Andres
AU - Azdejkovic, Lazar
AU - Miranda de Lima, Luiz
AU - Papanicolaou, Catherine G.
AU - Triantafillou, Thanasis C.
N1 - Funding Information:
We thank the generous contribution of Prof. Ioanna Papayianni and PhD Candidate Fotini Kessikidou at the Aristotle University of Thessaloniki in providing the first author training on the formulation of AAM mortars and the reference mix that was used at the start of this research project. We thank the company Aeiforos A.E. for the kind donation of steel slag and LFS.
Publisher Copyright:
© 2022 Arce A et al.
PY - 2022
Y1 - 2022
N2 - The need for repair and maintenance has become dominant in the European construction sector. This, combined with the urge to decrease CO 2 emissions, has resulted in the development of lower carbon footprint repair solutions such as textile reinforced mortars (TRM) based on alkali-activated materials (AAM). Life cycle studies indicate that AAM CO 2 savings, when compared to Portland cement, range from 80% to 30%. Furthermore, in this study, recycled aggregates were considered with the aim to promote a circular economy mindset. AAM mortars formulation based on fly ash, ladle furnace slag and metakaolin were tested for compressive and flexural strength. Three out of all formulations were chosen for an analysis on the potential of these mortars to be used for TRM applications. Tensile and shear bond tests, combined with a concrete substrate, were executed as indicators of the TRM effectiveness. Scanning electron microscopy and chemical analysis based on energy dispersive X-ray spectroscopy were used to interpret the results and reveal the reasons behind the different level of performance of these composites. Results indicated that TRM based on high calcium fly ash are unsuitable for structural strengthening applications due to low bond between matrix and/or substrate and fibers. Metakaolin-based TRM showed good performance both in terms of tensile strength and bond capacity, which suggests potential as a repair mortar.
AB - The need for repair and maintenance has become dominant in the European construction sector. This, combined with the urge to decrease CO 2 emissions, has resulted in the development of lower carbon footprint repair solutions such as textile reinforced mortars (TRM) based on alkali-activated materials (AAM). Life cycle studies indicate that AAM CO 2 savings, when compared to Portland cement, range from 80% to 30%. Furthermore, in this study, recycled aggregates were considered with the aim to promote a circular economy mindset. AAM mortars formulation based on fly ash, ladle furnace slag and metakaolin were tested for compressive and flexural strength. Three out of all formulations were chosen for an analysis on the potential of these mortars to be used for TRM applications. Tensile and shear bond tests, combined with a concrete substrate, were executed as indicators of the TRM effectiveness. Scanning electron microscopy and chemical analysis based on energy dispersive X-ray spectroscopy were used to interpret the results and reveal the reasons behind the different level of performance of these composites. Results indicated that TRM based on high calcium fly ash are unsuitable for structural strengthening applications due to low bond between matrix and/or substrate and fibers. Metakaolin-based TRM showed good performance both in terms of tensile strength and bond capacity, which suggests potential as a repair mortar.
KW - Alkali-activated materials
KW - Bond
KW - Geopolymer
KW - SEM
KW - Tensile strength
KW - Textile reinforced mortar
UR - http://www.scopus.com/inward/record.url?scp=85143498568&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85143498568&partnerID=8YFLogxK
U2 - 10.12688/openreseurope.14674.1
DO - 10.12688/openreseurope.14674.1
M3 - Article
AN - SCOPUS:85143498568
SN - 2732-5121
VL - 2
JO - Open Research Europe
JF - Open Research Europe
M1 - 79
ER -