• 보건의료산업학회지
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• 제5권4호
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• pp.65-79
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• 2011

The purpose of this study was to investigate the student nurse's perception and performance about the protecting behavior of the medical information. The subjects of the study were 365 senior nursing students. The data was analyzed by SPSS PC 19.0 program. 1) The mean scores of perception and performance by student nurse's on protecting behavior of the medical information were $4.39{\pm}0.40$ and $3.71{\pm}0.57$. 2) The perception on protecting behavior of the medical information was heavily dependent on the following age. 3) The performance on protecting behavior of the medical information was heavily dependent on the following career interests and work unit. 4) There was a positive correlation between the perception and performance about the protecting behavior of the medical information. The results showed the statistically significant partial correlation between the perception and performance. Therefore, it is suggested to apply the concrete education program to enhance the perception in order to improve the performance.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1998년도 가을 학술발표논문집(II)
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• pp.229-232
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• 1998

Recently it has become general to use the inhibitor with a view to protecting corrosion of rebars in concrete. As the inhibitors used in construction works are almost made in America or Japan, we immediately need to begin home production of inhibitors. In this paper, to estimate the domestic anodic inhibitor of nitrite in comparison with foreign made inhibitor we made some fundamental experiments of setting time, slump and compressive strength. Besides, we analysed the effect of corrosion protection of inhibitor on the ground of corrosion current, resistance to chloride penetration and diffusion of chloride ingress in concrete.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1998년도 가을 학술발표회 논문집(I)
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• pp.207-210
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• 1998

Recently it has become general to use the inhibitor with a view to protecting corrosion of rebars in concrete. So, it needs to study effect of protection and reasonable dosage of inhibitor to reduce corrosion of rebar in concrete containing chlorides. In this study, we estimate the corrosion rate of rebar in mortar by Tafel extrapolation method, one of electrochemical techniques, and the reasonable dosage of inhibitor for different chlorides environments.

• 한국구조물진단유지관리공학회 논문집
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• 제18권5호
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• pp.1-8
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• 2014

본 연구에서는 유황을 폴리머화하여 내화학성능이 요구되는 구조물의 콘크리트 표면보호재로 활용할 수 있도록 성능을 검토하였다. 평가 결과, 유황폴리머 표면도포재의 중력식 스프레이가 적절한 것으로 나타났으며, 도포횟수는 왕복 3회 이상 도포했을 때 1MPa 이상의 부착강도 확보가 가능하였다. 표면보호재가 도포될 콘크리트 표면조건은 상온조건 ($20{\sim}30^{\circ}C$) 이상에서 높은 부착강도를 나타내었으며, 온도가 높을수록 부착강도가 증가하였다. 표면보호재의 채움재 혼입량에 따른 강도특성 평가결과, 20~40% 정도 혼입된 채움재는 유황폴리머의 수축을 저감시키는 효과를 나타내어 강도 향상에 기여하였다. 또한, 플라이애시 보다는 규사 혼입시 부착강도가 높았고, 동시 혼입시 가장 우수한 부착강도 특성을 나타내었다. 화학저항성은 플라이애시 및 규사를 각각 20% 대체한 배합에서 부착강도 저하가 최소로 되어 우수한 내화학성을 나타내었다. 염소이온 침투에 대한 성능평가를 수행한 결과, 표면보호재를 도포하지 않은 시험체에 비하여 유황폴리머 표면보호재를 도포한 경우, 29~48% 정도 염소이온침투저항성이 증대되었다. 표면보호재의 도포조건, 압축강도, 부착강도, 화학저항성, 염해저항성 등을 모두 고려하여 볼 때, 본 연구범위에서는 유황폴리머에 채움재로서 규사와 플라이애시를 각각 20%씩 대체하는 것이 적절한 수준인 것으로 판단된다.

• International Journal of Concrete Structures and Materials
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• 제18권2E호
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• pp.103-109
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• 2006

Spalling is defined as damages to concrete exposed to high temperature during fire, causing cracks and localized bursting of small pieces of concrete. As the concrete strength increases, the degree of damage caused by spalling becomes more serious due to impaired permeability. It is reported that polypropylene(PP) fiber has an important role in protecting concrete from spalling, and the optimum dosage of PP fiber is 0.2%. However, this study was conducted on non-reinforced concrete specimens. The high-temperature behavior of high-strength reinforced concrete columns with various concrete strength and various quantity of PP fibers is investigated in this study. The results revealed that the ratio of unstressed residual strength of columns increased as the concrete strength increased and as the quantity of PP fiber increased from 0% to 0.2%. However, the effect of PP fiber quantity on residual strength of column was barely above 0.2%.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
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• pp.85-88
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• 2001

Utilization of demolished-concrete as recycled aggregate has been researched for the purpose of substituing for insufficient natural aggregate, saving resources and protecting environment. There, however, are some problems that qualities of recycled aggregates are not only largely diverse, but also mechanical properties of recycled aggregate concrete decrease a little in comparison with those of natural aggregate concrete. In this study, the resistance to freezing and thawing of recycled aggregate concrete was highly different due to adhered mortar on recycled aggregate, and durability factor of concrete with NA SRA and DRA was decreased more than that of control concrete. However, durability factor of concrete with AA SRA was larger than that of control concrete.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
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• pp.223-228
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• 2003

Recently, owing to the deterioration of reconstruction and the construction, much of the construction waste is discharged in our construction field, and the amount of construction waste is rapidly increased. These waste are raised to financial and environmental problems, so the method of reusing waste concretes has been studied and carried out many direction. Especially being want of resources, if waste concrete could be recycled as aggregates for concrete, it will contribute to solve the exhaustion of natural aggregate, in terms of saving resources and protecting environment. This study is that the mechanical properties of concrete with recycled coarse aggregate were investigated for types of mineral admixture and the substitution of recycled coarse aggregate. The result of this study, in case of using mineral admixture, the property of fresh concrete was rised. And the property of harden concrete for the substitution ratio of recycled coarse aggregate was decreased. But the property of concrete with mineral admixture was better than that of concrete used only cement.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 춘계 학술발표회 논문집(II)
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• pp.321-324
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• 2006

The latest concrete has showed that the deterioration of durability has been increased by the damage from salt, carbonation, freezing & thawing and the others. Therefore, it is needed to protect durability and performance according to the appropriate materials and methods in the concrete structures. In general, several types of polymer and silicate are used as protecting deterioration agents of concrete structures, but these agents have many problems because of low durability and properties. In this study, It developed the deterioration restraining agent using polycondensed silicate and monomer that can block a deterioration cause such as CO2 gas, salt and water from the outside and enhance waterproofing ability by reinforcing the concrete surface when applying it to concrete structures. Also, it evaluated improving concrete performance using a deterioration restraining agent.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1999년도 봄 학술발표회 논문집(I)
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• pp.355-360
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• 1999

Polymer cement is made by the modifying ordinary cement concrete with polymer additive. Until now polymer cement concrete is not used for the structural member, but it is growing to be considered as developing uses such as a waterproof of roof slab, the structural member for protecting corrosion, and a road pavement. The plymer cement concrete, being used for those uses, is superior to the cement concrete against the inorganic, organic acid, salt of acetic acid and organic solvents generally. In this paper, the polymer cement concrete was made by the ratio of 1:1 of sands and tailing in fine aggregate in order to solve the environmental pollution which causes the social problem by the tailing, It was measured for the compressive strength, flexural strength, and chemicals resistance was tested by dealing with 10% HCI, 20% NaOH and 10% NaCl aqueous solution.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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• pp.563-566
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• 2005

Concrete structures have been damaged by salt, carbonization, freezing and thawing and the others. Therefore, it is needed to protect durability and performance according to the appropriate materials and methods in the concrete structures. In general, several types of polymer and silicate are used as protecting deterioration agents of concrete structures, but these agents have many problems because of low durability and properties. In this study, It developed the deterioration restraining agent using polycondensed silicate and monomer that can block a deterioration cause such as $CO_2$ gas, salt and water from the outside and enhance waterproofing ability by reinforcing the concrete surface when applying it to concrete structures. Also, it developed the systems for improving concrete performance using a deterioration restraining agent.