Green Glass Foams from Wastes Designed for Thermal Insulation

Stochero, Naiane Paiva; Chami, J. O. R. de Souza; Moraes, Elisângela Guzi de; Oliveira, Antônio Pedro Novaes de

doi:10.1007/s12649-020-01120-3

Cited by 17 publications

(15 citation statements)

References 43 publications

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“…In addition, they contribute to reducing CO 2 emissions and the extraction of natural raw materials, bringing both environmental and economic benefits [1]. Due to its characteristics, several types of research have been carried out to introduce this solid waste in the manufacture of new products, such as macroporous materials [2][3][4]. Glass foams have a porous structure, with cells that can be isolated from each other (closed porosity) and cells that are fully or partially interconnected (open porosity) [5].…”

Section: Introductionmentioning

confidence: 99%

Manufacturing and characterization of sustainable macroporous glass foams

et al. 2022

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This work produced glass foams from soda-lime glass bottles, bentonite, and alumina by the replica method. Compositions with different contents of bentonite (5, 10, 15, and 20 wt%) were prepared and heat-treated at 800 °C. In the alumina-added compositions, 50 wt% of the bentonite was replaced by the alumina. The influences of the content of bentonite (binder) and alumina addition were evaluated through the physical-mechanical properties. The results showed that the alumina did not promote a significant effect on physical and mechanical properties in most glass foams; the exception was the sample with 20 wt% bentonite+alumina, which presented better physical properties (lower linear shrinkage and density and greater porosity) when compared to its equivalent sample (without alumina). Foams with 5% of bentonite or bentonite+alumina showed higher linear shrinkage indexes and high densification. Samples with 15% of bentonite or bentonite+alumina showed the best combination of properties: higher porosity (79.2% and 80.2%), water absorption (58.8% and 59.7%), lower shrinkage index (25.5% and 29.4%), and good flexural strength (0.69 and 0.45 MPa).

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Section: Introductionmentioning

confidence: 99%

Manufacturing and characterization of sustainable macroporous glass foams

et al. 2022

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“…Table 1 shows the results of chemical analyses (expressed in mass percentage of oxides) for GB and ES, which is characterized by high CaO content (96.5%). These data indicate the predominance of calcium carbonate in its composition 31 …”

Section: Resultsmentioning

confidence: 53%

“…The pore sizes ranged from 1 to 4 mm. Stochero 31 obtained similar porosity (86%) with higher thermal conductivity by applying a firing temperature of 850°C.…”

mentioning

confidence: 88%

“…These data indicate the predominance of calcium carbonate in its composition. 31 Concerning the production of glass foam, a proper selection of the firing temperature is critical, as it is directly related to the viscosity of the glass and its expansion caused by the release of gas from the decomposition of the foaming agent. For this reason, a detailed thermal analysis was performed on the eggshell residue.…”

Section: Characterization Of the Raw Materialsmentioning

confidence: 99%

“…Above ~800°C, CaO is the predominant compound. 23 It is worth mentioning that studies 31 have demonstrated the temperature at which the glass reaches its softening point, where the viscosity is such that it effectively allows the retention of the gases arising from the decomposition of the foaming agent within the glass matrix, promoting the expansion and, consequently, originating pores. The most suitable temperature range is between 800 and 1000°C, corresponding to viscosities between 10 5 and 10 3 Pa.s.…”

Section: Characterization Of the Raw Materialsmentioning

confidence: 99%

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Eggshells as agro‐industrial waste substitute for CaCO₃ in glass foams: A study on obtaining lower thermal conductivity

Mariosi

Arcaro

Venturini

et al. 2021

Int J Applied Ceramic Tech

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In this work, discarded glass bottles (GB) and eggshells (ES) were used to produce foam glass designed for thermal insulation. The literature on the thermal conductivity of foam glasses produced with eggshells is sparse. This material was used as pore‐forming agent at 3% and 5% weight fractions to obtain a foam glass with low thermal conductivity. Homogenized powders were uniaxially pressed, and the compacts were fired at three temperatures (800, 850, and 900°C). Raw materials were characterized by chemical analysis and particle size distribution. The foam glasses were characterized by their porosity, phases, compressive strength, and thermal conductivity. The best insulating properties were obtained for the composition containing 5 wt% ES fired at 800°C. This sample displayed a porosity of 91.4% while its thermal conductivity was of 0.037 W/m.K, with a compressive strength of 1.12 ± 0.38 MPa. Crystalline phases were observed in samples fired at 850 and 900°C as a result of the devitrification process. The final properties of the materials are comparable to those of commercial foam glasses obtained from non‐renewable, more expensive raw materials, a great indicator that the studied compositions could be used as an environmentally friendly substitute.

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Synthesis, structural, optical and experimental gamma-ray shielding properties of molybdenum-trioxide reinforced CRT glasses

Kurtulus,

Kavaz,

Kavas

et al. 2024

J Aust Ceram Soc

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Green Glass Foams from Wastes Designed for Thermal Insulation

Cited by 17 publications

References 43 publications

Manufacturing and characterization of sustainable macroporous glass foams

Manufacturing and characterization of sustainable macroporous glass foams

Eggshells as agro‐industrial waste substitute for CaCO₃ in glass foams: A study on obtaining lower thermal conductivity

Synthesis, structural, optical and experimental gamma-ray shielding properties of molybdenum-trioxide reinforced CRT glasses

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Green Glass Foams from Wastes Designed for Thermal Insulation

Cited by 17 publications

References 43 publications

Manufacturing and characterization of sustainable macroporous glass foams

Manufacturing and characterization of sustainable macroporous glass foams

Eggshells as agro‐industrial waste substitute for CaCO3 in glass foams: A study on obtaining lower thermal conductivity

Synthesis, structural, optical and experimental gamma-ray shielding properties of molybdenum-trioxide reinforced CRT glasses

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Eggshells as agro‐industrial waste substitute for CaCO₃ in glass foams: A study on obtaining lower thermal conductivity