Comparison of an earth mortar and common binder mortars for indoor plastering

José Lima, Paulina Faria, Rosário Veiga

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Plasters can be formulated with different binders, presenting different characteristics. Their main function is the
protection of the substrate but, as indoor coatings, their influence on aesthetic performance and indoor air quality and comfort
is also important. A plaster formulated with a clayish earth is compared to plasters formulated with common binders, namely
hemihydrate gypsum, air lime and natural hydraulic lime. All the plasters have the same volumetric proportion binder:sand
and were produced with the same siliceous washed sand. Results show that: the linear shrinkage of the earth mortar was the
highest while the gypsum mortar presented no shrinkage; the bulk density of all the mortars were similar but there were
differences on thermal conductivity, with advantages for the lime mortars, although this property is not significant for plasters
application thicknesses; the gypsum mortar presented the highest mechanical properties while the lime mortars presented the
lowest, even lower in comparison to the earth mortar; however, the resistance to dry abrasion was lower for the earth plaster;
the earth plaster registers a very high hygroscopicity in comparison to all the other plasters, being an important contribution
to indoor comfort, occupants health and energy consumption reduction.
Original languageEnglish
Title of host publication2nd International Conference on Sustainable, Environmentally Friendly Construction Materials
EditorsE. Horszczaruk, P. Brzozowski
Place of PublicationSzczecin, Poland
PublisherWest Pomeranian University of Technology, Szczecin Publishing House
Pages71-76
ISBN (Print)978-83-7663-324-4
Publication statusPublished - 2021
Event2nd International Conference on Sustainable, Environmentally Friendly Construction Materials - West Pomeranian University of Technology, Szczecin, Poland
Duration: 31 Aug 20212 Sep 2021
Conference number: 2
http://icsefcm.zut.edu.pl/

Conference

Conference2nd International Conference on Sustainable, Environmentally Friendly Construction Materials
Abbreviated titleICSEFCM 2021
CountryPoland
CitySzczecin
Period31/08/212/09/21
Internet address

Keywords

  • gypsum
  • natural hydraulic lime
  • plaster
  • clayish earth
  • air lime

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