Laboratory characterization of brick walls rendered with a pervious lime-cement mortar

Irene Palomar, G Barluenga, Richard Ball, Robert Lawrence

Research output: Contribution to journalArticle

Abstract

A laboratory study investigating important thermal retrofitting solutions for simple and double (cavity) brick walls is presented. Test walls were modified using materials of current interest including an external pervious lime-cement mortar render and insulation board prior to evaluation. Laboratory simulations of steady-state winter and summer scenarios were performed using apparatus comprising two opposing climate chambers. Temperature, relative humidity and heat flux rate were monitored with surface sensors every 10 min until stabilization on each wall type, retrofitting solution and climate scenario. The temperature and relative humidity profiles, heat flux, surface temperature difference, thermal conductance, condensation risk and stabilization times were assessed. Comparisons between simple and double (cavity) brick walls showed significant differences and a high condensation risk in the non-ventilated air cavity of the double wall. The pervious lime-cement mortar render enhanced substantially the thermal performance of the single wall although increased the condensation risk of the double (cavity) wall. As expected, the insulation layer reduced the thermal conductance of the wall, although the improvement in a summer scenario was considerably lower than in winter. The different performance observed between winter and summer steady-state conditions emphasized the importance of the heat and mass transfer coupling effect. Therefore, this work proves that effective retrofitting depends on materials, wall layouts and climate conditions. These experimental results provide essential knowledge about assessing the effects of common retrofitting solutions especially under hot-dry summer scenarios.

Original languageEnglish
Pages (from-to)241-249
Number of pages9
JournalJournal of Building Engineering
Volume23
Early online date6 Feb 2019
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • Brick walls
  • Heat and moisture transfer
  • Pervious mortar
  • Retrofitting
  • Thermal performance

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Safety, Risk, Reliability and Quality
  • Mechanics of Materials

Cite this

Laboratory characterization of brick walls rendered with a pervious lime-cement mortar. / Palomar, Irene; Barluenga, G; Ball, Richard; Lawrence, Robert.

In: Journal of Building Engineering, Vol. 23, 01.05.2019, p. 241-249.

Research output: Contribution to journalArticle

@article{2be0124d92a741a78ecc62fc82ce30a1,
title = "Laboratory characterization of brick walls rendered with a pervious lime-cement mortar",
abstract = "A laboratory study investigating important thermal retrofitting solutions for simple and double (cavity) brick walls is presented. Test walls were modified using materials of current interest including an external pervious lime-cement mortar render and insulation board prior to evaluation. Laboratory simulations of steady-state winter and summer scenarios were performed using apparatus comprising two opposing climate chambers. Temperature, relative humidity and heat flux rate were monitored with surface sensors every 10 min until stabilization on each wall type, retrofitting solution and climate scenario. The temperature and relative humidity profiles, heat flux, surface temperature difference, thermal conductance, condensation risk and stabilization times were assessed. Comparisons between simple and double (cavity) brick walls showed significant differences and a high condensation risk in the non-ventilated air cavity of the double wall. The pervious lime-cement mortar render enhanced substantially the thermal performance of the single wall although increased the condensation risk of the double (cavity) wall. As expected, the insulation layer reduced the thermal conductance of the wall, although the improvement in a summer scenario was considerably lower than in winter. The different performance observed between winter and summer steady-state conditions emphasized the importance of the heat and mass transfer coupling effect. Therefore, this work proves that effective retrofitting depends on materials, wall layouts and climate conditions. These experimental results provide essential knowledge about assessing the effects of common retrofitting solutions especially under hot-dry summer scenarios.",
keywords = "Brick walls, Heat and moisture transfer, Pervious mortar, Retrofitting, Thermal performance",
author = "Irene Palomar and G Barluenga and Richard Ball and Robert Lawrence",
year = "2019",
month = "5",
day = "1",
doi = "10.1016/j.jobe.2019.02.001",
language = "English",
volume = "23",
pages = "241--249",
journal = "Journal of Building Engineering",
issn = "2352-7102",
publisher = "Elsevier",

}

TY - JOUR

T1 - Laboratory characterization of brick walls rendered with a pervious lime-cement mortar

AU - Palomar, Irene

AU - Barluenga, G

AU - Ball, Richard

AU - Lawrence, Robert

PY - 2019/5/1

Y1 - 2019/5/1

N2 - A laboratory study investigating important thermal retrofitting solutions for simple and double (cavity) brick walls is presented. Test walls were modified using materials of current interest including an external pervious lime-cement mortar render and insulation board prior to evaluation. Laboratory simulations of steady-state winter and summer scenarios were performed using apparatus comprising two opposing climate chambers. Temperature, relative humidity and heat flux rate were monitored with surface sensors every 10 min until stabilization on each wall type, retrofitting solution and climate scenario. The temperature and relative humidity profiles, heat flux, surface temperature difference, thermal conductance, condensation risk and stabilization times were assessed. Comparisons between simple and double (cavity) brick walls showed significant differences and a high condensation risk in the non-ventilated air cavity of the double wall. The pervious lime-cement mortar render enhanced substantially the thermal performance of the single wall although increased the condensation risk of the double (cavity) wall. As expected, the insulation layer reduced the thermal conductance of the wall, although the improvement in a summer scenario was considerably lower than in winter. The different performance observed between winter and summer steady-state conditions emphasized the importance of the heat and mass transfer coupling effect. Therefore, this work proves that effective retrofitting depends on materials, wall layouts and climate conditions. These experimental results provide essential knowledge about assessing the effects of common retrofitting solutions especially under hot-dry summer scenarios.

AB - A laboratory study investigating important thermal retrofitting solutions for simple and double (cavity) brick walls is presented. Test walls were modified using materials of current interest including an external pervious lime-cement mortar render and insulation board prior to evaluation. Laboratory simulations of steady-state winter and summer scenarios were performed using apparatus comprising two opposing climate chambers. Temperature, relative humidity and heat flux rate were monitored with surface sensors every 10 min until stabilization on each wall type, retrofitting solution and climate scenario. The temperature and relative humidity profiles, heat flux, surface temperature difference, thermal conductance, condensation risk and stabilization times were assessed. Comparisons between simple and double (cavity) brick walls showed significant differences and a high condensation risk in the non-ventilated air cavity of the double wall. The pervious lime-cement mortar render enhanced substantially the thermal performance of the single wall although increased the condensation risk of the double (cavity) wall. As expected, the insulation layer reduced the thermal conductance of the wall, although the improvement in a summer scenario was considerably lower than in winter. The different performance observed between winter and summer steady-state conditions emphasized the importance of the heat and mass transfer coupling effect. Therefore, this work proves that effective retrofitting depends on materials, wall layouts and climate conditions. These experimental results provide essential knowledge about assessing the effects of common retrofitting solutions especially under hot-dry summer scenarios.

KW - Brick walls

KW - Heat and moisture transfer

KW - Pervious mortar

KW - Retrofitting

KW - Thermal performance

UR - http://www.scopus.com/inward/record.url?scp=85061264059&partnerID=8YFLogxK

U2 - 10.1016/j.jobe.2019.02.001

DO - 10.1016/j.jobe.2019.02.001

M3 - Article

VL - 23

SP - 241

EP - 249

JO - Journal of Building Engineering

JF - Journal of Building Engineering

SN - 2352-7102

ER -