• Applied Chemistry for Engineering
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• v.22 no.3
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• pp.332-335
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• 2011

As our interests in eco-friendly materials have been significantly increased, the utilization of porous zeolite concrete that has structural functionality and permeability has been increased. In this paper, the mixture of porous concrete and zeolite, which can be used as multirole boulders, was investigated for the suitability of an environment-friendly product by evaluating of the water purification ability. The contamination removal rates of BOD, TOC, T-N, and T-P in stagnant water tank were 70.6, 67.0, 57.7, and 50.6%, respectively. Also for the non-point source pollution with the inflow and the outflow, the removal rates of Zn, Pb, BOD, and COD were 99.9, 90.0, 69.2, and 33.5%, respectively. The performance of the heavy metal contamination removal for the porous zeolite showed better than that of stagnant system. Therefore, it is expected that the installation of the porous zeolite concrete can play a role as an eco-friendly products by its high contamination removal.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2006.05a
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• pp.78-80
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• 2006

광촉매를 삽입한 콘크리트 타일은 6시간 후의 VOCs 제거효율이 64 - 95%로서 종래의 건자재 보다 월등히 높은 제거효율을 나타내고 있다.

• International Journal of Highway Engineering
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• v.13 no.3
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• pp.51-63
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• 2011

Surface of fine-size exposed aggregate portland cement concrete pavements(FS-EAPCC) is consist by exposed coarse aggregate to remove upper 2~3mm mortar of concrete slabs. Advantages of FS-EAPCC are maintaining low-noise and adequate skid-resistance level during the performance period. However, FS-EAPCC is required rational management criteria for field application, since it is early stage for application. Design construction and quality control criteria of FS-EAPCC was temporary laboratory tests which including optimum mix and exposing method, selection of adequate aggregate, resistance against, environmental loading and etc. However, these criteria need to be validated base on field application. In this study, experimental constructions were performed and construction procedure and quality control criteria were suggested based on the performance of the FS-EAPCC.

• Proceedings of the Korea Concrete Institute Conference
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• 2003.11a
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• pp.198-201
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• 2003

The R.C Building will be superannuated as time passes. This program is generated by propagation of cracks. In order to manage such cracks, time and efforts, expense, etc. are required. In this study, glass sensors were embedding in a model beam and column and leakage of fluorescence and adhesive material was investigated. Further, currents in glass pipe were observed to find the leakage of liquid in glass pipes. Progressive cracks generated by cause the fracture of glass pipes. Therefore, the liquid become to flow and electric current stops, and the cracked part of the member can be found easily. Moreover, the adhesive delays progressive cracking system that responds in air, and the life of a structure can be made to extend. The purpose of this research is to develop of low price sensors that can perform of self-diagnosis in addition to ability of concrete repair concrete to damage.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2000.11a
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• pp.113-117
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• 2000

경량 건축소재는 건축자재의 경량화, 고급화 및 다양화 등의 기능성 건축소재로의 역할을 요구하고 있으며 그 중 대표적인 것으로는 polyurethane foam이 있다 일반적인 플라스틱 foam의 경량 건축소재는 난연성에 대한 문제점과 첨가제에 의한 중량 증가, 화재 발생시 과다연기발생 등의 문제점이 있으며 저밀도 콘크리트 등의 무기소재는 flexibility가 떨어져 충격과 휨강도가 매우 낮은 단점을 가지고 있다.(중략)

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2001.11a
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• pp.343-346
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• 2001

경량 건축소재는 건축자재의 경량화, 고급화 및 다양화 등의 기능성 건축소재로의 역할을 요구하고 있으며 그 중 대표적인 것으로는 polyurethane foam이 있다. 일반적인 플라스틱 foam의 경량 건축소재는 난연성에 대한 문제점과 첨가제에 의한 중량 증가, 화재발생시 과다연기발생 등의 문제점이 있으며 저밀도 콘크리트 등의 무기소재는 flexibility가 떨어져 충격과 휭강도가 매우 낮은 단점을 가지고 있다./sup 1.2)/ 열경화성 수지인 polyurethane도 난연성과 강도에 대한 단점을 가지고 있어 sodium silicate 혼합에 의한 난연성을 향상시킬 수 있으나/sup 3)/ 국내 난연 3급의 규격에도 미치지 못하는 특성을 가지고 있다.(중략)

• Magazine of the Korea Concrete Institute
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• v.5 no.1
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• pp.175-181
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• 1993

콘크리트 구조체공사의 가장 큰 영향을 미치는 것은 거푸집공사이며, 구조체공사의 합리적 관리는 거푸집공사의 작업생산성에 관한 기초자료를 확보함으로써 가능하다. 본 연구에서는 거푸집공사의 과학적 관리기반을 구축하기 위하여, 구조체 기준층을 대상으로 작업측정을 하여 유로폼공법, 재래식 거푸집공법 등 주요공법의 생산성을 도출하였다. 또한, 거푸집공사의 주요 작업인 조립, 해체, 운반등 단위 공정의 소요작업 품을 산출함으로써, 작업개선을 위한 실용적인 자료를 제시하였다. 마지막으로 거푸집 면적이 생산성과 상관관계가 매우 높다는데 착안하여 소요작업품을 예측할 수 있는 상관관계식을 유도함으로써, 공정관리 및 기능공의 수급예측이 가능토록 하였다.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.17 no.2
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• pp.141-150
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• 2004

Recently, it is really concerned about corrosion and aging of reinforced concrete bridges. Corrosional steel reinforcing in concrete affects not only safety of bridges structure but also bending strength of reinforced concrete's member. Rate of corrosion, characteristic of bending strength, and economical evaluation aren't clear in reinforced concrete, considering performance evaluation. The purpose of study is as follows. It studies about ability of resistance's strength and cost of life cycle according to reduction of steel reinforcing's corrosion. Moreover, it shows calculating formula of bending strength with corrosion of current rate and exactly evaluates about the rest life at corrosional reinforced concrete bridges.

• Proceedings of the Korea Concrete Institute Conference
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• 2009.05a
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• pp.171-172
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• 2009

A Bonded Concrete Overlay is a layer of concrete bonded to the top of an existing pavement to rehabilitate it, to restore and increase its structural and functional capabilities and forming a monolithic structure with the existing pavement. This study focuses on the field application of BCO by very early strength latex modified concrete.

• Magazine of the Korea Concrete Institute
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• v.3 no.4
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• pp.89-96
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• 1991

The maintenance techniques of reinforced concrete structures, which include diagnosis, repair and rehabilit¬ation, are not systematically establishtxL This study develops an expert system for maintenance of reinforced concrete structures based on the related documents and knowledge and experience of experts who work in these field. The analytical results using the developed expert system were compared to the real repair cases in field and they were generally satisfactory.