Hydrates and Morphology of Hydrated High Volume Blast Furnace Slag Cement

Shinobe, Kan; Nito, Nobukazu; Aikawa, Yoshihiro; Sakai, Etsuo

doi:10.14250/cement.71.68

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Thermal Stress Analysis Model1

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2020

2021

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“…Density was measured by the pycnometry in JIS Z 8807, Methods of measuring density and specific gravity of solid. The true density of the granulated slag was 2.91 g/cm 3 , which was almost identical with that of blast furnace slag fine powder in past reports, which gave values of 2.91 19,20) to 2.92 21) g/cm 3 . The measured value of the air-cooled slag was 2.94 g/cm 3 .…”

Section: Thermal Stress Analysis Modelsupporting

confidence: 86%

Behavior of Crack Generation of Slag in Continuous Solidification Process of Blast Furnace Slag

Ta¹,

Hoshino²,

Tobo³

et al. 2021

ISIJ Int.

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Section: Thermal Stress Analysis Modelsupporting

confidence: 86%

Behavior of Crack Generation of Slag in Continuous Solidification Process of Blast Furnace Slag

Ta¹,

Hoshino²,

Tobo³

et al. 2021

ISIJ Int.

View full text Add to dashboard Cite

Behavior of Crack Generation of Slag in Continuous Solidification Process of Blast Furnace Slag

Ta¹,

Hoshino²,

Tobo³

et al. 2020

Tetsu-to-Hagane

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A continuous solidification process of blast furnace slag was developed to promote the use of air-cooled slag coarse aggregate for concrete. In this process, the molten slag can solidify in only 120 s and the slag thickness is about 25 mm. This process suppresses gas generation and greatly reduces water absorption. Most of the slag is crystalline, and part of the slag has a glass layer on its surface. Slag with a glass layer is brittle because it contains several cracks. Therefore, microscopic observation and thermal stress analysis of the solidified slag were carried out to clarify the mechanism of crack generation in the plate-like slag. In the microscopic observation, several cracks with a length of about 8 mm were found in the slag with the glass layer. From the analysis, in the cooling pattern of the slag on the piled slag a temperature difference of about 200 K exists between the center and the mold side in the slag pit, and keeping this difference results in tensile stress of more than 50 MPa. However, in the cooling pattern of the crystalline slag in the piled slag, the temperature gradient in the slag in the slag pit was very small because the slag was retained in the piled slag, and as a result, the thermal stress was almost 0 MPa.

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Hydrates and Morphology of Hydrated High Volume Blast Furnace Slag Cement

Cited by 2 publications

References 4 publications

Behavior of Crack Generation of Slag in Continuous Solidification Process of Blast Furnace Slag

Behavior of Crack Generation of Slag in Continuous Solidification Process of Blast Furnace Slag

Behavior of Crack Generation of Slag in Continuous Solidification Process of Blast Furnace Slag

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