• Cement Symposium
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• s.35
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• pp.66-75
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• 2008

• Proceedings of the Korean Ceranic Society Conference
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• 2000.04a
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• pp.25.2-25.2
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• 2000

• Proceedings of the Korean Ceranic Society Conference
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• 2004.04b
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• pp.51.4-51.4
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• 2004

• Proceedings of the Korean Ceranic Society Conference
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• 2000.10a
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• pp.122.1-122
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• 2000

• Magazine of the Korea Concrete Institute
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• v.17 no.2 s.85
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• pp.48-55
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• 2005

• Cement Symposium
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• no.27
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• pp.6-13
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• 2000

• Journal of Adhesion and Interface
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• v.12 no.4
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• pp.138-143
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• 2011

Recently epoxy resin compositions having backbone of novolac derivatives with biphenylene compounds have been used as materials of eco-freindly EMC (Epoxy Molding Compound), because the cured epoxy resin compositions show the self-extinguishing without flame retardant additives. In this study, epoxy resin compositions were prepared and cured using novolac derivateves with biphenylene. Their propeties - structures of phenol derivatives and reactivity, thermal expansion, modulus, and thermal degradation - were obtained by DSC, DMA, TMA, TGA method. When both epoxy resin and hardenr had the biphenyl novolac structure, epoxy resin compositions showed low thermal expansion, good mechanical property, and combustion retardation.

• Journal of the Korean Recycled Construction Resources Institute
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• v.9 no.1
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• pp.13-19
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• 2021

In modern society, indoor activities time is increasing due to industrial development. Interest in indoor air quality is increasing as indoor activity time increases. The main causes of indoor air pollution are formaldehyde which a chemical cause, and fungi which a biological cause. Phytoncide effectively reduces Formaldehyde and Fungi. Charcoal which possess porous-structure has a good absorbance of pollutants. In this study, the authors manufactured functional cement matrix using by phytoncide and charcoal to remove formaldehyde and fungi. In this study, Functional cement matrix reduced formaldehyde and Fungi and effectively improve indoor air quality.

• Journal of the Korean Recycled Construction Resources Institute
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• v.12 no.1
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• pp.102-109
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• 2024

In order to use limestone powder as a material for concrete, the mechanical and durability characteristics of cement matrices manufactured by varying the substitution rate were evaluated. In general, limestone powder did not contribute to the cement hydration reaction, so as a result of the compressive strength test of cement mortar using it, the compressive strength decreased as the substitution rate increased. However, as a result of evaluating the durability performance of cement mortar using limestone powder, such as chloride ion penetration resistance, carbonation resistance, and chemical attack resistance, small particles of limestone powder showed superior results compared to the unsubstituted control mortar due to the micro-filler effect of filling the fine pores inside the cement matrix. Therefore, limestone powder is expected to be used as an effective method for improving the durability of concrete. In this study, the durability was evaluated by changing the mixing amount of limestone powder to 0 %, 5 %, 10 %, and 15 %, but it is judged that it is necessary to study in more detail the effect on the durability by changing the end and mixing amount of limestone powder to various levels in the future.

• Journal of the Korea institute for structural maintenance and inspection
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• v.12 no.6
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• pp.55-62
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• 2008

This paper reports the effect of replacement levels of silica fume on the resistance to magnesium sulfate attack. Mortar specimens incorporating silica fume were exposed to 5% magnesium sulfate solution for 360 days at ambient temperature. The main variable was the replacement levels of silica fume(0, 5, 10 and 15% of cement by mass). The resistance of mortar specimens incorporating silica fume against magnesium sulfate attack was regularly monitored by measuring compressive strength and expansion. In addition, in order to investigate the reactants formed by magnesium sulfate attack, various instrumental analyses such as XRD, SEM and DSC were used. Results demonstrated that the formation of gypsum, thaumasite and brucite led to a significant deterioration due to magnesium sulfate attack in cement matrix incorporating silica fume.