Effects of Molding Pressure and Sintering Temperature on Properties of Foamed Glass without Blowing Agent

Kim, EunSeok; Kim, Kwangbae; Lee, Hyeryeong; Kim, Ikgyu; Song, Ohsung

doi:10.4191/kcers.2019.56.2.03

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…Figure 6 shows the thermal conductivity relative to the basalt-fiber addition amount. This verified that thermal conductivity increases with greater addition of basalt-fiber because the thermal conductivity of basalt-fiber, 0.8 W/m•K [13], is comparatively higher than that of foam glass, 0.115 W/m•K [14]. Thus, an increase in basalt-fiber addition results in an increase in thermal conductivity.…”

Section: Resultssupporting

confidence: 58%

Properties of basalt-fiber reinforced foam glass

Kim

Song

2020

Journal of Asian Ceramic Societies

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The changes in mechanical properties and thermal conductivities of fiber reinforced foam glass produced by adding 0~50 wt% basalt-fibers to 10 µm glass powder containing 6 wt% nanocarbon via low-temperature sintering at 750°C were examined. The prepared basalt-fibers had an aspect ratio of 70.88. To study the microstructure of the foam glass, optical microscopy and scanning electron microscopy were conducted. To assess the mechanical properties and thermal conductivity of the sample, a compressive strength tester and a heat flowmeter were used, respectively. The sample was confirmed to have closed pores up to the addition of 15 wt% basalt-fiber, with open pores being observed from 20 wt% or more. Microstructure analysis showed that the sample was shown to have dense basalt-fiber clusters with an even distribution of pores at 13 wt% basalt-fibers, whereas irregular pores formed with more basaltfiber addition. Compressive strength was increased by approximately 48 % compared to the sample without basalt-fiber addition while the sample with 13 wt% basalt-fibers showed gradual improvement up to a total of 2.96 MPa and then a gradual decrease with more addition. The thermal conductivity was seen to increase from 0.16 to 0.28 W/m•K with increasing basalt-fiber addition; nevertheless, the properties were suitable for using the samples as a thermal insulator.

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Section: Resultssupporting

confidence: 58%

Properties of basalt-fiber reinforced foam glass

Kim

Song

2020

Journal of Asian Ceramic Societies

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“…In the sample with no added NC, the pores became larger as the sintering temperature increased. This occurred owing to the SO 3 → SO 2 + 1/2 O 2 reaction within the glass starting materials even when there was no C present, as observed in a previous study by Kim et al [10]. This has a bigger effect than the foam gas expansion caused by the C + O 2 → CO 2 reaction resulting from the carbon blowing agent, and it is believed that the inclusion of NC does not have a large effect until 4 wt%.…”

Section: Methodsmentioning

confidence: 60%

Properties of foamed glass upon addition of nanocarbon and sintering temperatures

Kim

Song

2020

Journal of Asian Ceramic Societies

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As a blowing agent, 2-10 wt% of nanocarbon (NC) was added 10 µm glass powder (CaO, MgO, Al 2 O 3 , SO 3 , 83 wt%-SiO 2) and sintered at 700-900°C to fabricate foamed glasses with closed pores that were 62-2200 µm. Optical microscopy was used to examine the microstructure and pore size. Compressive strength tester and a heat flow meter were used to examine the changes in mechanical strength and thermal conductivity. The microstructure examination results showed that was performed at 700°C, 297.9-351.3 µm pores were fabricated, and the porosity was 57-63 % in the sample that contained 6-10 wt% NC. At sintering temperatures above 750°C, the pore size increased as the NC content and the sintering temperature increased. The thermal conductivity was maintained at less than 0.28 W/m‧K. Therefore, it is possible to use 6-8 wt% NC as a blowing agent in glass material to produce foamed glass that has closed pores of approximately 500 µm with better or equivalent compressive strength and thermal conductivity properties than existing 1000 µm grade foamed glass, despite being sintered at a temperature of approximately 100°C lower.

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“…60 So, adding more BFs makes the thermal conductivity go up more than that of foam glass, which is 0.115 W/mK. 61 But a study found that adding steel fibers to concrete makes it better at transferring heat at temperatures up to about 700°C, with the most improvement at room temperature. This rise in thermal conductivity can be explained by the fact that steel has about 50 times more thermal conductivity than concrete.…”

Section: Thermal Conductivitymentioning

confidence: 99%

Thermal properties, microstructure analysis, and environmental benefits of basalt fiber reinforced concrete

Qsymah

Arbili

Ahmad

et al. 2023

Journal of Engineered Fibers and Fabrics

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Numerous scientists have studied basalt fiber (BF) reinforced concrete and found encouraging results. However, information is scattered, and compressive assessment is yet necessary to collect the data from prior research on BF, present research advancement, and future research guidelines of BF reinforced concrete. Furthermore, mostly research focus to review on strength and durability aspects of BF reinforced concrete while no researched focus on thermal properties, microstructure analysis and environmental benefits of BF reinforced concrete. Therefore, the primary focuses of this paper are BF treatment, BF reinforced concrete performance at high temperatures, microstructure analysis, environmental advantages, and application in civil engineering. Results show that BF-reinforced concrete performs much better than traditional concrete at high temperatures. Additionally, the use of BF enhanced the heat conductivity of concrete. BF addition to concrete seems to have reduced interfacial transition zone (ITZ) fractures, according to a microstructure study. When opposed to traditional steel fibers, BFs may be thought as reinforcements that are less harmful to the environment. The study also highlights the significance of BFs in the building industry. The assessment also identified research gap research for further studies.

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Effects of Molding Pressure and Sintering Temperature on Properties of Foamed Glass without Blowing Agent

Cited by 9 publications

References 7 publications

Properties of basalt-fiber reinforced foam glass

Properties of basalt-fiber reinforced foam glass

Properties of foamed glass upon addition of nanocarbon and sintering temperatures

Thermal properties, microstructure analysis, and environmental benefits of basalt fiber reinforced concrete

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