• Cement
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• s.159
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• pp.31-39
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• 2003

• Journal of the Korean Recycled Construction Resources Institute
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• v.9 no.2
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• pp.185-190
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• 2021

Cement has been used as a main material in the modern construction industry. However, it has been pointed out as a main cause of global warming due to carbon dioxide generated during manufactured. Recently, research that replacing cement substitute to industrial by-products such as Blast Furnace Slag which is by-producted in steelworks. When Blast Furnace Slag is used as a cement substitute, it shows a problem of lower initial strength, which is caused by glassy membrane on the particle surface. In this study, we used Electrolysis Alkaline Aqueous to improve the usability and problem of lower initial strength. As a result of the experiment, cement matrix using Blast Furnace Slag and Alkaline Aqueous showed initial strength and hydrate product were developed than that using general mixing water. Also, as a result of porosity analysis, It was confirmed that cement matrix using Alkaline Aqueous and Blast Furnace Slag has a tighter structure in internal porosity and porosity distribution than using general mixing water.

• Journal of the Korean Ceramic Society
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• v.39 no.1
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• pp.99-107
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• 2002

Impedance Spectroscopy (IS) has been used to study microstructure and hydration mechanism of cement pastes. In this work, the early hydration behaviour of portland cement paste with different blame values and contents of blast-furnace slag was investigated by IS. As slag was added to portland cement, the values of $R_{t(s+1)}$ (the solid-liquid phase resistance) and $R_{t(int)}$ were decreased in the early hydration period. It showed that hydration of cement paste containing slag was slower than it of the reference cement paste. As the content of slag was increased, the values of $R_{t(s+1)}$ was decreased. Furthermore, the diameter of semicircle, $R_{t(int)}$ observed at 72 hours was decreased with the increment of slag content. However, the values of $R_{t(s+1)}$ and $R_{t(int)}$ were increased with blame value of slag from the early hydration period.

• Clean Technology
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• v.7 no.2
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• pp.109-117
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• 2001

Whereas commonly used to make concrete having rich water contents as binder or mineral admixture, blast furnace slag has been rarely applied to manufacture in concrete based products having poor water contents. This study, for the multi-recycling of blast furnace slag, is to analyze strength enhancement mechanism of concrete based products using blast furnace slag. The results of this study are following. We found that blast furnace slag is very effective mineral admixture to manufacture high strength spacer having over $400kgf/cm^2$ in compressive strength. Also, enhancement of strength by blast-furnace slag are responsible to densified grading and pozzolanic reaction.

• Journal of the Korean Recycled Construction Resources Institute
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• v.1 no.1
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• pp.35-41
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• 2013

In this study, we investigated the strength development and durability of geopolymer mortar using blast furnace slag only, and admixed with blast-furnace slag and fly ash as cementious materials in oder to develop cementless geopolymer concrete. In order to compare with the geopolymer mortar, the normal mortar using ordinary portland cement was also test. In view of the results, we found out that strength development, the resistance to freezing-thawing of the geopolymer mortar have better than the mortar using ordinary portland cement. Especially, using the combined with blast furnace slag and fly ash develop high strength of above 60 MPa, and improve the resistance of freezing-thawing of approximately 20%, but promote the velocity of carbonation of 2.2~3.5 times.

• Cement Symposium
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• s.49
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• pp.84-90
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• 2022

• Cement Symposium
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• no.28
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• pp.63-66
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• 2001

• Cement Symposium
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• no.30
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• pp.7-24
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• 2003

• Cement
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• s.157
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• pp.40-45
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• 2002

• Cement
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• s.156
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• pp.61-66
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• 2002