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Lightweight thermal insulating coating mortars with aerogel, EPS, and vermiculite for energy conservation in buildings
https://orcid.org/0000-0003-1914-594X
https://orcid.org/0000-0003-2561-5231
Abstract Mechanical, thermal, microstructural, and acoustic properties of optimized lightweight coating mortars were analyzed. The fine aggregate was partially replaced by insulant alternative aggregates: silica aerogel, expanded polystyrene, and vermiculite. The consistency index, incorporated air content, water retention, compressive strength, mass density, water absorption, voids index, thermal conductivity, SEM microstructure analysis, and acoustic absorption were investigated. As a case study, the thermal resistance parameters were calculated for Brazilian bioclimatic zones, for two ceramic bricks masonry systems. Silica aerogel reduced the mortar thermal conductivity by up to 60% (EPS 53%, vermiculite 48%), and reduced the coating thickness from 3.4 cm to 1.4 cm for the same thermal performance. Microstructural analysis suggests a chemical reaction between silica from aerogel and pore solution from the cement mortar forming C–S–H gel with a low Ca/Si ratio. EPS mortar obtained the best performance for the acoustic insulation, and the silica aerogel mortar obtained the lowest performance.
Graphical abstract Display Omitted
Highlights Silica aerogel reduced 60% the coating thickness for the same thermal performance. Silica aerogel reduced thermal conductivity by 60%. EPS up to 53%, vermiculite 48%. Reaction between silica aerogel and pore solution from cement mortar forming C–S–H. Ca/Si ratio was close to 1 in the cement matrix, decreasing as it enters the aerogel. Lightweight mortars showed greater sound absorption from 500 to 1000 Hz.
Lightweight thermal insulating coating mortars with aerogel, EPS, and vermiculite for energy conservation in buildings
https://orcid.org/0000-0003-1914-594X
https://orcid.org/0000-0003-2561-5231
Abstract Mechanical, thermal, microstructural, and acoustic properties of optimized lightweight coating mortars were analyzed. The fine aggregate was partially replaced by insulant alternative aggregates: silica aerogel, expanded polystyrene, and vermiculite. The consistency index, incorporated air content, water retention, compressive strength, mass density, water absorption, voids index, thermal conductivity, SEM microstructure analysis, and acoustic absorption were investigated. As a case study, the thermal resistance parameters were calculated for Brazilian bioclimatic zones, for two ceramic bricks masonry systems. Silica aerogel reduced the mortar thermal conductivity by up to 60% (EPS 53%, vermiculite 48%), and reduced the coating thickness from 3.4 cm to 1.4 cm for the same thermal performance. Microstructural analysis suggests a chemical reaction between silica from aerogel and pore solution from the cement mortar forming C–S–H gel with a low Ca/Si ratio. EPS mortar obtained the best performance for the acoustic insulation, and the silica aerogel mortar obtained the lowest performance.
Graphical abstract Display Omitted
Highlights Silica aerogel reduced 60% the coating thickness for the same thermal performance. Silica aerogel reduced thermal conductivity by 60%. EPS up to 53%, vermiculite 48%. Reaction between silica aerogel and pore solution from cement mortar forming C–S–H. Ca/Si ratio was close to 1 in the cement matrix, decreasing as it enters the aerogel. Lightweight mortars showed greater sound absorption from 500 to 1000 Hz.
Lightweight thermal insulating coating mortars with aerogel, EPS, and vermiculite for energy conservation in buildings
https://orcid.org/0000-0003-1914-594X
https://orcid.org/0000-0003-2561-5231
Abstract Mechanical, thermal, microstructural, and acoustic properties of optimized lightweight coating mortars were analyzed. The fine aggregate was partially replaced by insulant alternative aggregates: silica aerogel, expanded polystyrene, and vermiculite. The consistency index, incorporated air content, water retention, compressive strength, mass density, water absorption, voids index, thermal conductivity, SEM microstructure analysis, and acoustic absorption were investigated. As a case study, the thermal resistance parameters were calculated for Brazilian bioclimatic zones, for two ceramic bricks masonry systems. Silica aerogel reduced the mortar thermal conductivity by up to 60% (EPS 53%, vermiculite 48%), and reduced the coating thickness from 3.4 cm to 1.4 cm for the same thermal performance. Microstructural analysis suggests a chemical reaction between silica from aerogel and pore solution from the cement mortar forming C–S–H gel with a low Ca/Si ratio. EPS mortar obtained the best performance for the acoustic insulation, and the silica aerogel mortar obtained the lowest performance.
Graphical abstract Display Omitted
Highlights Silica aerogel reduced 60% the coating thickness for the same thermal performance. Silica aerogel reduced thermal conductivity by 60%. EPS up to 53%, vermiculite 48%. Reaction between silica aerogel and pore solution from cement mortar forming C–S–H. Ca/Si ratio was close to 1 in the cement matrix, decreasing as it enters the aerogel. Lightweight mortars showed greater sound absorption from 500 to 1000 Hz.
Lightweight thermal insulating coating mortars with aerogel, EPS, and vermiculite for energy conservation in buildings
Bergmann Becker, Patricia Fernanda (author) / Effting, Carmeane (author) / Schackow, Adilson (author)
2021-10-02
Article (Journal)
Electronic Resource
English
| DOAJ | 2023
Vermiculite insulating concrete
| Engineering Index Backfile | 1945
| Taylor & Francis Verlag | 2022