TY - JOUR
T1 - Eco-efficient plastering mortars for improved indoor comfort
T2 - The influence of A. dealbata bark addition
AU - Ranesi, Alessandra
AU - Faria, Paulina
AU - Freire, Maria Teresa
AU - Gonçalves, Margarida
AU - Veiga, M. Rosário
N1 - Publisher Copyright:
© 2024
This research was supported by Portuguese Foundation for Science and Technology (FCT- Fundação para a Ciência e a Tecnologia): PD/BD/ 150399/2019 – 1st author Doctoral Training Program EcoCoRe. The authors are also grateful for FCT support through funding UIDB/04625/2020 of the research unit Civil Engineering Research and Innovation for Sustainability – CERIS and UIDB/04077/2020 – Mechanical Engineering and Research Sustainability Center – METRICS and UIDB/05064/ 2020 - Research Centre for Endogenous Resource Valorization – VALORIZA and for the support of the projects Back2Future (2020–1-PT01- KA203–078406) and BIO-FIBRE (2022–1-DK01-KA220-HED000086641) funded by the Erasmus+ Programme of the European Union. The authors would like to thank the National Laboratory for Civil Engineering of Portugal (LNEC) for the laboratory equipment and the support provided through the projects REuSE - Wall coverings for Rehabilitation: Safety and Sustainability; the Departments of Civil Engineering and Chemistry of the NOVA School of Science and Technology of the NOVA University of Lisbon, the Department of R&D of SIVALGessos Especiais, Lda, American Clay Enterprises LLC and the Healthy Building Research Laboratory of the Portland State University.
PY - 2024/3/29
Y1 - 2024/3/29
N2 - The passive contribution of indoor coatings to improve interior comfort is an eco-efficient challenge nowadays. Gypsum is one of the more eco-efficient binders available to produce plasters. Acacia dealbata is an invasive plant species in many countries, and the management of its wood waste for fires prevention is imperative. This study intends to evaluate the effect of using Acacia dealbata bark waste, directly after milling (raw) or with additional thermal treatment (1 h at 250 ⁰C), as an addition to an industrial gypsum-based plastering mortar to passively improve indoor comfort. To prevent the biological colonization, air lime is also added. Two clay-based plasters are used for comparison, as this type of plaster is known for being highly hygroscopic, together with a reference gypsum plaster. Results show that both the gypsum-bark mortars fulfill the standard requirements and do not show biological vulnerability. They doubled the moisture buffering of the reference gypsum plaster and got closer to the hygroscopic performance of the clay plasters. The very similar results between the two gypsum-bark mortars suggest that the thermal treatment of bark is not an eco-effective choice. So, the raw bark-added gypsum mortar is selected as a promising coating material to passively contribute for indoor comfort in an innovative, eco-efficient, way.
AB - The passive contribution of indoor coatings to improve interior comfort is an eco-efficient challenge nowadays. Gypsum is one of the more eco-efficient binders available to produce plasters. Acacia dealbata is an invasive plant species in many countries, and the management of its wood waste for fires prevention is imperative. This study intends to evaluate the effect of using Acacia dealbata bark waste, directly after milling (raw) or with additional thermal treatment (1 h at 250 ⁰C), as an addition to an industrial gypsum-based plastering mortar to passively improve indoor comfort. To prevent the biological colonization, air lime is also added. Two clay-based plasters are used for comparison, as this type of plaster is known for being highly hygroscopic, together with a reference gypsum plaster. Results show that both the gypsum-bark mortars fulfill the standard requirements and do not show biological vulnerability. They doubled the moisture buffering of the reference gypsum plaster and got closer to the hygroscopic performance of the clay plasters. The very similar results between the two gypsum-bark mortars suggest that the thermal treatment of bark is not an eco-effective choice. So, the raw bark-added gypsum mortar is selected as a promising coating material to passively contribute for indoor comfort in an innovative, eco-efficient, way.
KW - Air lime
KW - Biomass
KW - Calcium sulfate hemihydrate gypsum
KW - Gypsum plaster
KW - Moisture buffering
KW - Passive moisture indoors regulation
UR - http://www.scopus.com/inward/record.url?scp=85188246574&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2024.135572
DO - 10.1016/j.conbuildmat.2024.135572
M3 - Article
AN - SCOPUS:85188246574
SN - 0950-0618
VL - 421
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 135572
ER -
