Utilization of Basic Oxygen Furnace Slag in Geopolymeric Coating for Passive Radiative Cooling Application

Wu, Chia-Ho; Huang, Chiung-Wei; Li, Yeou-Fong; Lee, Wei‐Hao; Cheng, Ta‐Wui

doi:10.3390/su12103967

Cited by 6 publications

(4 citation statements)

References 29 publications

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“…From the Frattini test, BOF had 90% lime removal, FA had 47%, and IOT had 30%, indicating high, considerable, and reduced pozzolanic activity, respectively. These results are found to be in correlation with previous findings [59,60], which have reported similar degrees of pozzolanicity for these materials.…”

Section: Frattini Testsupporting

confidence: 93%

Pozzolanic potential of sustainable precursors for engineered geopolymer composites (EGC)

Subramanian,

Davis,

Thomas

2024

Eng. Res. Express

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Confirming the pozzolanic activity is crucial to ensure their compatibility and performance in geopolymer composite (GC) applications, as it improves the geopolymerization process and optimizes the strength characteristics of GCs. This work evaluates the pozzolanic properties of Fly ash (FA), Basic Oxygen Furnace (BOF) slag, and Iron Ore Tailings (IOT) for their potential use in the development of Engineered Geopolymer Composites (EGC). IOT partially substitutes fine aggregate, while FA and BOF slag are the major precursors. Pozzolanic properties of the aforementioned materials were assessed through the Frattini, saturated lime test (SLT), and strength activity index (SAI). The Frattini test values recorded were 90, 47, and 30 % of CaO removal, denoting their degree of pozzolanicity respectively for BOF Slag, FA, and IOT. In the SLT, the formation of stable calcium silicate hydrates and aluminates are verified by the reaction of the test pozzolans with lime, thereby conforming their pozzolanicity. The results from the Frattini and SAI tests showed a significant correlation, indicating an effective pozzolanicity measure of the test materials. However, the results from the SLT did not align with the outcomes from the Frattini and SAI tests. This contradiction suggests that the SLT is ineffective compared to the other two test methods in measuring the pozzolanic activity of the test materials. The research findings provide valuable insights into the potential usage of these materials (pozzolans) as sustainable building materials in the construction industry.

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Section: Frattini Testsupporting

confidence: 93%

Pozzolanic potential of sustainable precursors for engineered geopolymer composites (EGC)

Subramanian,

Davis,

Thomas

2024

Eng. Res. Express

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“…Therefore, it was difficult to make a comparison with the earlier investigations. 6,8,10,18 However, the radiative cooling effect of the Si 2 N 2 O particles added cement composite material was sufficiently observed, and we suggested the composites of this study was a passive cool system for the cement structure by radiative cooling.…”

Section: Resultsmentioning

confidence: 71%

“…The 2 wt.% and 10 wt.% specimens with 10 mm thickness showed significant radiative cooling of 0.92 W/m 2 and 0.56 W/m 2 respectively at 90 • C. Earlier studies investigated the radiative cooling effect between "ambient" and "radiative cooling material". 6,8,10,18 This investigation evaluated the "radiative cooling effect as the material" between a "blank" and a "radiative cooling composite" under ambient temperature. Therefore, it was difficult to make a comparison with the earlier investigations.…”

Section: Resultsmentioning

confidence: 99%

Designing of passive cooling silicon oxynitride composite cement

Miyazaki

Eguchi

Tsuruda

2023

Int J Applied Ceramic Tech

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Si 2 N 2 O, which shows high radiative cooling ability, was mixed and hardened with ordinary Portland cement to prepare cement specimens having radiative cooling abilities. The bulk cement specimens were prepared with diameters of 50 mm and two different thicknesses of 3 and 10 mm, and Si 2 N 2 O powder were mixed with 2 and 10 wt%. The temperatures of the blank specimen (without radiative cooling Si 2 N 2 O powder) and the cement composite specimens were measured in a thermostatic chamber maintained at ambient temperature, and the radiative cooling abilities of the specimens were evaluated. The obtained specimens showed a radiative cooling ability in the range 0.077-0.92 W/m 2 ; thus, the results of this study suggested the possibility of a cement composite with passive cooling property.

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“…The results showed that this coating had an obvious radiation cooling effect and great insulation ability owing to the emissivity and reflectivity. Furthermore, the adhesion and weather resistance were maintained at a certain level [16].…”

Section: Introductionmentioning

confidence: 99%

A Study on Radiation Cooling Effect on Asphalt Concrete Pavement Using Basic Oxygen Furnace Slag to Replace Partial Aggregates

Yang

et al. 2021

Sustainability

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In this study, aggregates in asphalt concrete were partially replaced by basic oxygen furnace slag (BOFS) in proportions of 45 wt.%, 55 wt.%, and 75 wt.%. The thermal performances of the specimens are discussed based on the thermal conductivity, emissivity, and the indoor and outdoor temperature measurements. Consequently, 75 wt.% of the specimen’s aggregates were replaced by BOFS, which had a high emissivity of 0.86 across the sky window. In the indoor and outdoor tests, the temperature change was recorded to estimate the thermal performance of specimens. According to the quantitative calculation, when the substitution of BOFS was higher than 55 wt.%, the specimens had a better radiation cooling ability. Among these specimens, the specimen with the BOFS substitution of 75 wt.% absorbed the most heat inside the body, contributing to less heat remaining in the environment. Furthermore, because Newton’s cooling energy accounted for about 90% of the stored energy within 7 h, the heat dissipation after the seventh hour was primarily radiation cooling, corresponding to the emission across the urban boundary layer. As for the mechanical properties, the stability value, indirect tensile strength, and British pendulum number (BPN) were in line with the specifications under the proper BOFS substitution. In conclusion, BOFS has great applicability in pavements due to its thermal performance and mechanical properties. It not only achieves the goal of urban heat island mitigation by radiation cooling, but also reflects the concept of resource sustainability.

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Utilization of Basic Oxygen Furnace Slag in Geopolymeric Coating for Passive Radiative Cooling Application

Cited by 6 publications

References 29 publications

Pozzolanic potential of sustainable precursors for engineered geopolymer composites (EGC)

Pozzolanic potential of sustainable precursors for engineered geopolymer composites (EGC)

Designing of passive cooling silicon oxynitride composite cement

A Study on Radiation Cooling Effect on Asphalt Concrete Pavement Using Basic Oxygen Furnace Slag to Replace Partial Aggregates

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