Producing light, strong foam glass under a low sintering temperature with insights from molecular simulations

Zhai, Chenxi; Zhang, Jing; Tao, Xin; Wang, Mingchao; Zhu, Yumei; Yeo, Jingjie

doi:10.1016/j.jnoncrysol.2022.121447

Cited by 5 publications

(2 citation statements)

References 59 publications

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“…The traditional way of foam glass manufacturing is the powder method based on foaming of the mixture prepared from a glass powder with a blowing agent [11]. Using cullet allows us to recycle non-conforming glass products, part of the municipal waste, and also reduces energy costs for production of the material [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Influence of Silica Fume on the Production Process and Properties of Porous Glass Composite

2023

Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.

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The article is devoted to the development of the composition and production of a porous glass composite for thermal insulation purposes using a single-stage technology with a reduced NaOH content at temperatures not exceeding 850 °C. Silica-containing natural (tripoli) and technogenic (silica fume) raw materials were used for the synthesis of glass composite. The composition of the charge based on tripoli and silica fume is proposed, which ensures the production of a porous glass composite using energy-saving technology. A mixture of tripoli and silica fume activated with sodium hydroxide is an alternative to the traditional method of producing foam glass materials. The high dispersion of raw materials, the amorphous-crystalline structure of tripoli and the amorphous structure of silica fume ensure a high reactivity of the charge. The novelty of the study lies in reducing the amount of alkali to 10.5% and obtaining a material with increased mechanical strength (up to 4 MPa). It is established that the increased mechanical strength of the material is due to the dissolution of residual quartz and crystallization of cristobalite, as well as the production of a homogeneous fine-porous structure of a porous glass composite with an average pore size of 0.6+ 0.2 mm. Addition of SiO2 to the charge in the form of silica fume in an amount from 10 to 50 wt.% reduces the foaming temperature from 860 to 820 °C and increases the strength of the material from 1.5 MPa (without silica fume) to 4 MPa (30 wt.% of silica fume). The resulting porous glass composite differs from traditional foam glass type heat insulators in increased strength and is considered as a thermal insulation and structural material. The article is of great practical importance, as it solves two problems. On the one hand, the expansion of the raw material base for the production of porous materials with the involvement of waste. On the other hand, the expansion of the scope of application by increasing the strength of the material.

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Section: Introductionmentioning

confidence: 99%

Influence of Silica Fume on the Production Process and Properties of Porous Glass Composite

2023

Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.

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“…Numerous studies have been conducted on factors affecting the engineering properties of glass foam, such as type of glass [19][20][21][22][23][24], amount of waste glass used [25], types and amounts of foaming agents [22,26], gas composition [27], sintering temperature and rate of temperature [23,26,28]. Zhai et al [29] successfully developed a type of foam glass with exceptional properties. They demonstrated that foam glass samples with smaller pores and a more uniform pore structure enhance mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance of Foam Glass Aggregate at Different Compaction Ratios

2023

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The use of glass waste in the construction industry has a high potential of leading to a higher recycling percentage. Foam glass aggregate (FGA) is around 98% recycled glass waste of various origins and has good insulation properties with big grain size distributions ranging between 10 mm and 60 mm. FGA has a wide range of applicability in the construction industry, which significantly differs from each implementation in the case of built-in conditions of the material. Therefore, investigating the impact of different compaction ratios, temperature, and relative humidity conditions on the thermal performance of such material is very important. In the present work, the samples of foam glass aggregates have been prepared with four different compaction ratios (10%, 20%, 30%, and 40%) to measure their impact on the material’s mechanical and thermal insulation properties. The obtained results revealed that the dry density property of the material linearly increased with elevated compaction ratios. In contrast, the submergence density did not follow the same trend behaviour under the same circumstances. The vertical strain of the foam glass aggregates decreased with increased compaction ratios, and a significant correlation behaviour was observed between the vertical strain and increased compaction ratios at high compressional loads. The material’s thermal conductivity increased with increasing compaction ratios in both 50% relative humidity and 95% relative humidity, while for the submergence condition, a significant decrease in their values was observed after compacting the material by 40%. The thermal conductivity is tested at 10 °C and 30 °C using the TLS and GHP methods. The thermal resistance of foam glass aggregate layers was calculated based on the measured results, showing an approximately linear decreasing trend with increasing compaction ratios. While the submerged foam glass aggregate samples demonstrated stable thermal resistance values at 30% compaction, by raising the compaction ratio to 40%, the material’s thermal resistance increased once again. The experimental results also found the temperature conversion coefficients, which can be used to convert the compacted FGA materials’ thermal conductivity to the temperature experienced in a different built-in state than the laboratory measurements. Our study demonstrates the broad usability of foam glass aggregate as a compacted thermal insulating layer in the building industry.

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Influence of the temperature field on the formation of thermally foamed silicate materials based on industrial waste

Yatsenko,

Goltsman,

Izvarin

et al. 2024

J Therm Anal Calorim

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Producing light, strong foam glass under a low sintering temperature with insights from molecular simulations

Cited by 5 publications

References 59 publications

Influence of Silica Fume on the Production Process and Properties of Porous Glass Composite

Influence of Silica Fume on the Production Process and Properties of Porous Glass Composite

Thermal Performance of Foam Glass Aggregate at Different Compaction Ratios

Influence of the temperature field on the formation of thermally foamed silicate materials based on industrial waste

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