Earth, gypsum and cement-based plasters contribution to indoor comfort and health

Tânia Santos, Paulina Faria, Maria Idália Gomes

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Abstract

Indoor air quality is important for comfort and health of buildings inhabitants.
The use of environmentally friendly building materials is also very important
for sustainable and green buildings. In the present study, mechanical characteristics of five mortars were comparably analyzed: two unstabilized earth mortars, one earth-air lime mortar, one cement mortar and other gypsum mortar. The earthen plasters are nowadays commonly applied unpainted. The gypsum plaster system is composed by the base mortar and a finishing layer; it can be applied unpainted or painted. The cement plaster is generally finished with a paint system.
Therefore, the adsorption and desorption capacities were assessed for all the
plasters and the influence of the paint system was evaluated for the cement and
gypsum plasters. Results show that the earth mortar stabilized with air lime presents lower mechanical strength, in comparison to all other mortars, and lower
adsorption capacity, similar to the gypsum system. The unstabilized earth plasters
present high adsorption capacity, in comparison to the cement and gypsum plasters.
The paint system does not have significant influence on the adsorption capacity
of the gypsum plaster but reduced that capacity on the cement plaster.
These results demonstrate the important contribution that unstabilized earth plasters may provide as passive indoor hygrothermal buffers, in comparison to other plasters.
Original languageEnglish
Title of host publication3rd RILEM Spring Convention 2020 – Ambitioning a Sustainable Future for Built Environment. Comprehensive Strategies for Unprecedent Challenges
EditorsE. B. Pereira, J. A. O. Barros, F. P. Figueiredo
Place of PublicationCham
PublisherSpringer
Pages105-117
Number of pages12
ISBN (Electronic)978-3-030-76547-7
ISBN (Print)978-3-030-76546-0
DOIs
Publication statusPublished - 2021
Event3rd RILEM Spring Convention 2020 - Guimarães, Portugal
Duration: 10 Mar 202014 Mar 2020

Publication series

NameRILEM Book Series
PublisherSpringer
Volume32
ISSN (Print)2211-0844

Conference

Conference3rd RILEM Spring Convention 2020
CountryPortugal
CityGuimarães
Period10/03/2014/03/20

Keywords

  • Air lime
  • Clay
  • Desorption
  • Mechanical strength
  • Sorption
  • Mortar

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