산업화, 도시화로 인해 수자원의 오염이 악화 되면서 기존에 염소를 이용한 정수처리 방법으로는 깨끗한 물을 공급하는데 어려운 실정이다. 이에 오존을 이용한 고도정수 처리 시설의 도입이 증가하고 있다. 그러나 기존의 방수⋅방식 공법으로 사용되는 에폭시계 방수⋅방식제 및 스테인리스는 오존의 강력한 산화력으로 인해 열화되어 박리 등 문제 발생하였으며, 콘크리트까지 영향을 미쳐 내구성 저하의 원인이 된다. 이에 따라 본 연구에서는 내오존성 및 내화학성이 뛰어난 금속 패널을 기존의 시공법 보다 손쉬운 방법으로 시공하기 위한 방법으로 금속용사 공법을 이용하여 수처리 시설 콘크리트 구조물의 열화를 원천적으로 방지하기 위한 마감공법 개발 연구의 일원으로 용사금속 종류 에 따른 내오존성 평가를 실시하였으며, 실제 하수처리장 환경에서의 전기화학적 안정성능 평가를 실시하였다. 실험결과 용사금속 Ti이 용사 후에도 내오존성이 뛰어난 것으로 나타났으며, 하수처리장 환경에서의 전기화학적 안정성능 평가 결과 용사금속 Ti가 403.83k∙ Ω∙cm2의 가장 높은 분극저항을 나타남으로써 높은 수준의 내구성을 확보하는 것을 확인할 수 있었다.

In this study, the gamma-ray shielding characteristics of mortar specimens substituted CRT waste glass as a fine aggregate were evaluated. According to the results, the linear attenuation coefficient of mortar specimen replaced with CRT waste glass was increased. Especially, the half-value layer of CRT waste glass specimen in radiation source of 122KeV·57Co was 48% higher than that of normal sand specimen.

기존의 정수처리 방법으로는 제거되지 않는 물질이 발생함에 고도정수 처리 시설의 도입이 증가하고 있다. 그러나 오존을 이용한 고도정수처리 시설의 내부 방수·방식재는 오존의 산화력에 의해 열화되며 콘크리트까지 영향을 미쳐 내구성 저하의 원인이 된다. 본 연구에서는 내오존성 및 내화학성이 뛰어난 금속 패널을 기존의 시공법 보다 손쉬운 방법으로 시공하기 위한 방법으로 금속용사 공법을 이용하여 수처 리 시설 콘크리트 구조물의 열화를 원천적으로 방지하기 위한 마감공법 개발 연구의 일원으로 용사금속 종류 및 피막의 표면처리 방법에 따른 내오존성 평가를 실시하였으며, 오존처리 후의 부착강도를 평가하였다. 실험결과 용사금속 Ti이 용사 후에도 내오존성이 뛰어난 것으로 나타 났으며 표면처리 방법으로는 테프론계 봉공처리제를 사용하여 마감하는 것이 내오존성 및 부착성능 확보에 가장 적합한 방법이라 판단된다.

The joints in this construction are formed through the bonding shear evaluation method during the placement of ultra-high-performance concrete (UHPC). The evaluation items include push-off tests for homogeneous UHPC + UHPC. The experimental samples comprised a monolithic placement as the baseline, two levels for the separated placement according to the compression strength of concrete, and five levels for the interface treatment. The bonding shear performance for the homogeneous UHPC + UHPC construction linearly increased with the width and depth of the grooves used for the interface treatment. The increase in the number of grooves and their cross-sectional areas only slightly influenced the bonding shear performance. The optimal interface treatment method for the homogeneous UHPC + UHPC construction grooves was at least 30 mm.

In this study, the expandable shale collected from the same area in Korea is fired to confirm the foamability. The firing uses an electric furnace capable of firing up to 1600 ℃. The shale was classified into three types according to its constituent and apparent characteristics, and each component was analyzed by XRD analysis method. The shale was fired considering the firing temperature and the residence time. As a result of firing, it was found that the firing temperature was different by more than 100 degrees and it was confirmed that the foaming property was increased with increasing temperature

In this study, flexural and tensile properties of pre-cast UHPC deck joints with surface treatment applied to fields were evaluated. It showed that all specimen set experimental variables satisfied sufficient resisting load efficiency and crack standard.

Recently, Advanced water treatment facilities with Ozone are being introduced domestically. However, waterproofing/corrosion prevention construction method of concrete structure for existing advanced water treatment makes waterproofing/corrosion prevention materials and concrete deteriorated because of strong oxidation of ozone. Therefore, in this study, It was evaluated in ozone resistance and bond strength of metal spraying coating.

This study is corroborated as a fundamental resource to develop lightweight foamed concrete. Weight of unit volume decreased until 0.8% dosage of foaming agent is put cement paste. After that, Mechanical properties of cement paste with foaming agent is verified to use FEM analysis based on picture image. Finally, It is compared with compressive strength of experiment and estimation from picture image.

This study is, when we pour the concrete, doing bonding shear performance evaluation to search the influence about an adhesive interface by a generated cold joint with a retardation time. In conclusion, this experiment shows that the higher a compressive strength of the concrete is, the higher a reduction ratio of the bonding shear strength is, and the instance of a none agitation and a compaction with 15 minutes of a retardation time are the lowest influence in a whole of the results; each of the reduction ratio of the bonding shear strength is approximately 4.5%.

Recently, Advanced water treatment facilities with Ozone are being introduced domestically. However, waterproofing/corrosion prevention construction method of concrete structure for existing advanced water treatment makes waterproofing/corrosion prevention materials and concrete deteriorated because of strong oxidation of ozone. Therefore, in this study, using a metal spraying system was evaluated for bond strength between concrete and metal spraying coating.