• Cement Symposium
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• s.40
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• pp.20-28
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• 2013

• Proceedings of the Korean Institute of Building Construction Conference
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• 2012.05a
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• pp.195-196
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• 2012

In this study, it was investigated early age strength generation of low cement concrete with type and addition ratio of hydration accelerator obtaining fundamental data for the application in construction field.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2013.11a
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• pp.46-47
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• 2013

In this research, it is investigated strength development by replacement ratio of mineral admixture contents, types of superplastisizer and strength improvement material contents based on industrial byproduct to expand use of low cement concrete for typical floor.

• The Journal of the Korea Contents Association
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• v.19 no.2
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• pp.277-283
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• 2019

In this study, low molecular weight chitosan (LC) was added to dental cement liquid at 0, 0.5, 1.0, and 2.0 wt% by weight for surface properties and oral bacteria adhesive of dental cement. The evaluated by net setting time and surface properties of surface energy on the surface roughness. The degree of oral bacterial adhesion was assessed using two strains of oral bacteria, S. mutans and E.coli. The results showed that the setting time at the LC0.5 group increased no statistically difference was observed (p<0.05). The surface roughness statically significant LC2.0 group and oral bacteria adhesion experiment results in contrast to the control group LC0, LC-added experimental group showed a somewhat lower adherent surface statistically significant difference was observed (p<0.05). It seems that this LC proved that surface properties and oral bacteria adhesion effect was demonstrated. Therefore, it was suggest that the additional effects of LC and research on a wide range of substances.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.04a
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• pp.589-592
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• 2008

This study was conducted to assess the durability of Chloride-inhibiting Low-Heat Cement while being subjected to freezing-thawing during winter seasons. Although durability varies slightly depending on the conditions of the jobsite, frost damage to concrete resulting from repeated freezing and thawing over the course of seasonal changes is the leading cause behind lowered concrete durability. in addition, concrete that has been subjected to freezing and thawing during the winter season develops a significant amount of expansive force at the core and begins to exhibit signs of damage, such as cracking, peeling, and detachment from the aggregate. Therefore, this study fabricated test specimens using a Chloride-inhibiting Low-Heat Cement(CLC) and the widely used blast furnace slag cement(BFS) and Ordinary Portland Cement(OPC) with water-to-cement ratios of 35%, 40% and 45%, respectively, to assess the durability index of the CLC as per resistance to freezing-thawing. The specimens were then tested using the KS F 2456 method (Testing method for resistance of concrete to rapid freezing and thawing) to measure the dynamic modulus of elasticity. The dynamic modulus of elasticity measurements were then used to derive the durability indices. By comparing the durability indices, it was confirmed that CLC, BFS, and OPC all had superior durability.

• Cement Symposium
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• s.34
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• pp.73-79
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• 2007

• Cement Symposium
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• s.46
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• pp.121-126
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• 2019

• Cement Symposium
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• s.43
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• pp.91-95
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• 2016

• Journal of the Korean Geotechnical Society
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• v.22 no.4
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• pp.31-39
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• 2006

An experimental investigation was carried out to evaluate the strength characteristics of low cement ratio soil stabilizer. The low cement ratio soil stabilizer has been developed by the replacement of certain part of cement with by-product pozzolanic materials such as blast furnace slag, fly ash, waste gypsum and by using activator. A series of unconfined compressive strength tests were performed to investigate and obtain high-strength composite soil stabilizer with large amounts of blast furnace slag and fly ash. Test results show that there were better properties when blast furnace slag, fly ash, waste gypsum, and activator were added in proper ratio. The replacement of certain part of cement with by-product pozzolanic materials improved the strength and pore structure properties.

• Cement
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• s.38
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• pp.16-21
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• 1970

시멘트공업경영은 자본집약산업으로 그 규모는 일정수준의 단위까지 팽창되지 않으면 안되는 시장경쟁적 여건을 포함하고 있는데 특히 시멘트제품의 수급비탄력성은 방대한 규모의 생산시설과 여기에 투입된 노동을 유휴화시키고 이로 인한 기업의 고정비부담을 가중시키므로 적자의 가장 큰 요인으로 작용하고 있다. 이와 같은 유휴비용중 특히 노무비부담이 큰 비중을 점하고 있는데 현세멘트공업계의 임금제도는 저생산저임금형태로 기업과 종업원에게 공히 유용한 요소가 되고 있다. 이러한 시멘트의 계절적인 수요변동에 따라 성수기에 있어서는 노동의 부족을 나타내고 비성수기에 있어서는 확대된 부분이 축소된 것만큼 인원을 감소시켜야하므로 노사간의 불화와 기업공신력의 상실등을 야기시키게 되어 기업측이나 종업원측으로 보아서도 서로의 손실임에는 틀림없다. 따라서 이와 같은 문제는 합리적인 임금제도 및 영리의 결여에서 오는 것인 만큼 기업과 종업원에 공히 이득을 가져와 줄 수 있는 성과급제도의 도입적용에 시급히 필요하다고 하겠다.