Construction with soil-cement blocks as a sustainable alternative for building envelopes
DOI:
https://doi.org/10.22320/07190700.2022.12.01.08Keywords:
sustainable bricks, passive thermography in buildings, reduction of heat losses, thermal conductivity, surface thermal resistanceAbstract
Alternative materials, such as cement-stabilized earth blocks (CSEB), provide new opportunities to make environmentally friendly envelopes. Earth-based construction materials are easy to obtain, abundant in nature, and their use minimizes environmental impacts and improves the thermal performance of bricks. In this work, the thermal properties of CSEB are analyzed, to evaluate their efficiency for building envelopes. It is experimentally determined that cement percentages are between 3% and 9% for the manufacturing of CSEB for non-bearing masonry. The moisture content should be less than 20%, to avoid significant increases in thermal conductivity. Wall thermal resistivity and inner and outer thermal resistance are also determined by means of passive building thermography measurements. The different CSEB wall compositions of experimental dwellings under real use conditions were monitored during the winter, and from this, thermal transmittances were established for the walls of 1,219 W/m2K to 1.599 W/m2K The results obtained allow determining the relative efficiency of each building envelope type in avoiding heat losses.
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