표면 마감 광촉매 스프레이 모르타르의 리바운드량 저감 방안 연구

백효선(Hyo-Seon Baek),박정환(Jeong-Hwan Park) 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.9

콘크리트 표면 마감에는 다양한 방법이 있으며, 시공성을 고려할 때 스프레이 방법이 효과적이나 리바운드 발생현상이 발생한다. 통상 숏크리트의 손실률은 30-45%가량 보고되고 있으며, 이로 인하여 작업 효율 저하 및 공사비 상승등의 문제를 발생시킨다. 이를 해결하고자 다양한 선행 연구가 진행되었으며 리바운드량을 저감하기 위해서는 사용재료에 따라 리바운드 발생 억제를 위해 배합을 조정하여야 하며 본 연구에서는 광촉매가 포함된 표면 마감재료에 적합한 리바운드 발생량 저감 목적의 배합 기술에 대한 기초 연구를 진행하였다. 본 연구의 선행연구로는 광촉매 성능에 대해 저감효과 및 최적 혼합 비율을 도출하였고, 선행연구를 바탕으로 규사 함량에 따른 리바운드 저감 및 혼화 재료 별 역학적 내구 특성 검증을 진행하였다. 시험 방법으로는 리바운드, 압축강도, 휨강도, 테이블 플로 시험으로 진행하였고, 모르타르 스프레이 장비의 작업성을 고려하였을 때 Flow 170±10mm로 고정하였다. 실험 변수로는 시멘트 중량 대비 규사변수로 맞추어 리바운드량 측정을 하였고 규사는 5호, 7호 규사를 사용하였다. 실험 결과 최종 S-1 변수에서 가장 높은 압축강도를 나타냈고 리바운드 양을 최소화할 수 있었다. 이러한 결과는 규사 공극의 결합재가 충분히 충진하게 되어 골재 사이의 결합력이 증가되므로 낮은 리바운드 양을 확보할 수 있었다. There are various methods of finishing concrete surfaces, and when considering workability, the spray method is effective, but rebound occurs. The allocation of rebound occurrence control should be adjusted according to the materials used. Thus, a basic study was conducted on multiple techniques for reducing the rebound incidence that are suitable for surface finishing materials containing a photocatalyst. A prior study derived the reduction effect and optimal mix ratio for photocatalytic performance. Based on that study, the rebound reduction was verified according to the specifications of the content and the mechanical durability characteristics of the mixed materials. Rebound, compressive strength, flexural rigidity, and table flow tests were done. The flow was fixed at 170±10 mm considering the workability of the mortar spray equipment. For the experimental variables, the rebound number was adjusted to the silica sand variables relative to the cement weight, and silica sands No. 5 and No. 7 were used. The results show the highest compression strength in the final S-1 variable, and the amount of rebound was minimized. These results were sufficiently filled with the bindings of the silica pores, which increased the binding force between the aggregates, resulting in a lower amount of rebound.

바인더 및 색소에 따른 이산화티타늄의 NO 제거효율 변화

백효선(Hyo-Seon Baek),박정환(Jeong-hwan Park),승인배(In-Bae Seung) 대한환경공학회 2019 대한환경공학회지 Vol.41 No.2

미세먼지는 인체에 해로운 영향을 주고 있어 사회적으로 이에 대한 저감 필요성 및 요구가 증가하고 있으나 대부분의 대책이 규제를 통한 발생원 차단에 중점을 두고 있어 저감에는 한계가 있다. 이에 본 연구는 규제가 아닌 원인물질을 제거할 수 있는 기술을 개발하고자 미세먼지를 유발하는 질산이온(NO₃<SUP>-</SUP>)이 2차 생성을 통해 미세먼지로 전환되지 않도록 광촉매를 이용한 처리 기술 개발에 관한 연구이다. 기술 개발을 위하여 바인더 종류, 시공방법, 색소에 대한 NO 제거율 변화에 대한 실험을 실시하였으며 바인더로 천연시멘트와 백시멘트를 이용하고 시공방법으로는 타설과 뿜칠을 비교하였으며 색소로는 녹색, 적색, 흑색에 대한 제거율 변화를 관찰하였다. 실험결과 천연시멘트가 백시멘트에 비하여 NO제거율이 56~67% 수준임을 확인하였고 시공방법에 대한 실험을 통해 진동의 영향을 받은 타설 방법보다 진동영향이 없는 뿜칠이 2배 이상 제거율이 향상됨을 확인할 수 있었으며 색소에 대한 영향은 녹색이 바인더 및 시공방법에 관계없이 적색, 흑색보다 제거율이 낮게 형성됨을 확인 할 수 있었다. The reduction is limited because most of the measures focus on blocking the source through regulation. Therefore, this study is a study on the development of treatment technology using Photocatalytic so as to prevent the conversion of Nitrogen ion causing fine dust into fine dust through secondary generation in order to develop a technology that can remove the causative substance. For the development of the technology, experiments were carried out on the change of NO removal rate to binder type, construction method and pigment. Natural cement and white cement were used as binders. The method of construction was compared with concrete placement and spraying. The removal rates of green, red and black pigments were observed. Experimental results show that the removal rate of natural cement is higher than that of white cement by 56~67%. Experiments on the construction method show that the removal efficiency of the spraying without vibration is more than 2 times higher than that of the concrete placement method. The effect of the pigments on the pigments was found to be lower than that of red and black irrespective of binder and construction method.

하천폭의 국부적 축소 및 확대에 따른 수리특성 연구

최한규(Choi Han Kuy),김주석(Kim Ju Suk),백효선(Baek Hyo Sun) 강원대학교 산업기술연구소 2007 産業技術硏究 Vol.27 No.1

This research investigated the way of generating the flowing of water in case of artificial fluctuation of river width by the unidimensional numerical analysis in order to reconstruct vertical and expanse features of flowing, and the problem of existing numerical analysis in accordance with local enlargement and reduction of river through hydraulic model experiments with results of numerical analysis. The result revealed that when the local section change in the same river is exist, it showed 0.93m in the case of no change of local section in the hydraulic model experiments and numerical analysis, however, it presented 1.645m on the occasion of local section changes in the hydraulic model experiments and numerical analysis, In other words, there was a significant difference in the existing numerical analysis, when there was a local section change. As a result of the experimental section for the enlargement and reduction of local river width, due to the sensitive change for fluctuation of flood discharge, there was a significant difference between numerical analysis and hydraulic model experiments. In addition, the result of comparison between the enlargement and reduction of local river width confirmed that the result of numerical analysis with hydraulic model experiments showed larger generation of deviation in case of enlargement of section than in case of reduction of section.

강원도 하천 호안 실태조사

최한규(Choi, Han-Kuy),정영덕(Jung, Young-Duk),백효선(Baek, Hyo-Seon) 강원대학교 산업기술연구소 2009 産業技術硏究 Vol.28 No.B

The propose of this study is to survey the revetments installed in Gangwon Province for identifying their characteristics. The survey showed that in eastern Gangwon Province, gabion, retaining wall and concrete blocks took about 63% or more, and in western Gangwon Province, dry wall, gabion and retaining wall,68% or more. Gabion and dry wall had better vegetation coverage in western Gangwon Province than in eastern Gangwon Province. That is thought to be due to slope of river and under-water frequency.

춘천호내 인공습지 조성에 따른 흐름특성 분석

최한규(Choi, Han-Kuy),박재국(Park, Jae-Guk),백효선(Baek, Hyo-Seon) 강원대학교 산업기술연구소 2009 産業技術硏究 Vol.28 No.B

Based on the data interpretation on an artificial marsh built in Chun-cheon Lake, the study analyzed flow characteristics and found that flow was unstable due to sediment of natural river but the effect of artificial marsh was similar with that of river improvement works. Flow velocity in the section of artificial marsh was found to be 1m/sec. Therefore flow velocity was stable, which could contribute to improving water quality. A flow velocity as well as stream vector was improved.

하천 설계기준의 만곡부 수면형 결정방법에 대한 적용성 검증에 관한연구

채홍기(Chea Hong-KI),김진수(Kim Jin-Soo),백효선(Baek Hyo-Sun),최한규(Choi Han-Kuy) 대한토목학회 2006 대한토목학회 학술대회 Vol.2006 No.10

수치해석을 이용한 윤중제 흐름특성해석 적용성

최한규(Choi Han Kuy),김장욱(Kim Jang Uk),백효선(Baek Hyo Sun) 강원대학교 산업기술연구소 2008 産業技術硏究 Vol.28 No.1

When the existing polder levee was constructed, the river’s numerical analysis decided the bank raise by applying the planned flood stage or by using the result from the sectional 1st dimensional numerical analysis. But, it was presented that there is a limitation in the 1st dimensional value analysis when the structure like the polder levee obstructs the special shaped running water flow. Therefore, in order to verify the numerical value applicability when the polder levee is constructed, this report compared each other through the 1st and 2nd dimensional numerical analysis and the mathematical principle model laboratory. In case of the polder levee construction through the numerical analysis and the mathematical principle model laboratory, it was decided that there was no big problem in the 1st dimensional numerical analysis applied design, considering the uncertainty of mathematical principle analysis though the first dimensional numerical analysis was calculated a little bigger than the second. But, after construction, it was found that the water level deviation of the 1st, 2nd occurred biggest at the place where the flow was divided into two. Also, as a result of comparing the 1st, 2nd dimensional numerical analysis with the mathematical principle model laboratory, it was confirmed that the 1st numerical analysis applied design decreased the modal safety largely, as the left side water level was calculated smaller more than 0.5m in case of the 1st dimensional numerical analysis.

누설 및 프린징 자속을 고려한 종자속형 자기부상 전자석의 힘 특성 해석

유주성(Ju-Sung Yu),권두진(Du-Jin Kwon),이준병(Joon-Byung Lee),백효선(Hyo-Sun Baek),조한욱(Han-Wook Cho) 대한전기학회 2011 대한전기학회 학술대회 논문집 Vol.2011 No.7

雨水管路 滿水時 水理學的擧動에 대한 XP-SWMM와 水理模型實驗의 比較 硏究

최한규,백효선,백두열 강원대학교 산업기술연구소 2005 産業技術硏究 Vol.25 No.B

To use land more efficiently under urbanization trend, Kangwon Province often covers open channels of creeks and uses them as parking lots or roads. A covered open channel section tends to form a rectangular culvert. Therefore, a creek with covered open channels can function as a storm drain. At the time of light rainfall, there are no significant differences except water flowing pattern between a creek with a covered open channel and a creek without it. Recently, however, the frequent occurrence of heavy rainfalls limited at a small, definite area has become problematic. When the heavy rainfall causes the carrying capacity of a creek to be exceeded, the creek with covered open channel has a more serious problem than the creek without it has. Therefore, we made an interpretation of data and conducted hydraulic model experiment to come up with economical solution to this problem.

분수로 분류부 형상에 따른 유량분배율 특성의 실험적 연구

최한규,백효선,이석환 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.A

The divided channel is not often used on the river and when the installation is for the controlling of the flow quantity. The determination of the channel size is not a easy task. Model tests are examined to confirm the variation of distribution rate by the method of the channel installation and the position of the structure and the adjustment of numerical simulation is executed by the comparing of the results. This study is to execute numerical model according to installation of divided channel by using AQUADYN program, the 2nd dimension numerical model, and HEC-RAS program, the 1st dimension numerical model, by the shape of divided channel. Also, it compares with difference by method about each case.