열화 및 교통하중에 의한 소입경 골재노출 콘크리트 포장의 마모 및 탈리 특성

문상봉,김영규,이승우 한국도로학회 2020 한국도로학회논문집 Vol.22 No.3

PURPOSES : Concrete pavement is excellent in structural performance and durability. However, its functionality – such as noise and skid resistance – is a shortcoming. Functionality such as noise reduction and skid resistance of concrete pavement is affected by the texture surface, and the texture surface is classified according to the length of the wavelength. In recent years, Fine-size exposed aggregate concrete pavement has been applied, which has excellent structural performance and durability, and secures functionalities such as noise reduction and long-term skid resistance by randomly forming texture surface. Fine-size exposed aggregate concrete pavements are constructed by removing the surface cement binder to randomly expose coarse aggregate and their functionality is mainly governed by the surface texture. However, deteriorated concrete by tire-pavement friction and deicing agent may cause abrasion and aggregate loss on the surface texture; thus reducing their functional performances. Abrasion is created by the thin cutoff of aggregate texture under repeated tire-pavement friction. In addition, aggregate loss is defined by the detachment of aggregates from cement binder. This study aims to evaluate the abrasion and aggregate loss of Fine-size exposed aggregate concrete pavement surface texture under tire-pavement friction and scaling tests. METHODS : In the study, abrasion and aggregate loss of tining and exposed aggregate concrete surface treatments were evaluated. Deterioration of each surface treatment was replicated by scaling test under ASTM C 672 test method. Afterward, abrasion test was conducted by ASTM C779 to simulate the tire-pavement friction under traffic. Consequently, abrasion and aggregate loss were measured. RESULTS : Abrasion depth of non-scaling tining, 10-mm EACP, and 8-mm EACP was 1.76, 1.12, and 1.01mm, respectively. Compared to scaling surface treatments, the difference of abrasion depth in tining texture was the largest with value of 0.4mm. For both textures of finesize exposed aggregate concrete, abrasion depth difference was about 0.1mm. Moreover, The 10-mm EACP exhibited a 2.6% of aggregate loss rate caused by tire-pavement friction before conducting concrete deterioration test. After 40-cycle scaling test, aggregate loss increased up to 12.2%. For 8-mm EACP, aggregate loss rate was 1.7% on non-scaling concrete. Further, this rate was magnified up to 7.3% for the 40-cycle scaling concrete. CONCLUSIONS : Under non-scaling or scaling tests, fine-size exposed aggregate concrete pavement showed better abrasion resistance than tining texture since tining was formed by aggregates and cement binder. Additionally, rate of aggregate loss was significant when EACP experienced the deicing agent under numerous cycles of freeze-thaw action.

학술발표회 초록 ( 공정시스템 (Ⅴ) ) : 폐수처리를 위한 Electrodialyzer System 의 최적설계

문상봉(Sang Bong Moon),박선원(Sun Won Park) 한국화학공학회 1994 춘계학술발표회 Vol.- No.-

안전운전을 위한 수전해 STACK의 설계

문상봉(S.B. Moon),셀리말(Celly Marll Nguina Poussou),박찬성(C.S. Park),최윤기(Y.K. Choi) 한국가스학회 2023 한국가스학회 학술대회논문집 Vol.2023 No.5

大企業과 中小企業體間의 協力關係活性化 方案에 관한 實證的 硏究

文相奉(Moon, Sang-Bong) 조선대학교 지식경영연구원 1997 기업과 혁신연구 Vol.20 No.1

전기화학 촉매의 개발 및 이의 선박평형수용 전기분해 및 수전해의 응용 현황(Development of electrochemical catalyst and its application for ballast water)

문상봉,정혜영,윤대진 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

최근 저기화학 촉매분야의 떠오르는 분야는 환경관련 선박평형수 처리 분야와 에너지 문제에 대응하기 위한 수전해 분야이다. 해양 환경의 위협 요인 중 하나로 선박평형수로 인한 생태계 교란 문제가 대두됨에 따라 선박평형수에 포함된 해양 미생물의 처리에 대한 필요성이 높아지고 있다. 선박평형수 처리로 가장 기대되는 물질로는 염소가 주목받고 있으며, 염소는 해수로부터 전기분해를 통해 얻을 수 있으므로 선백평형수를 직접적으로 이용 가능하여 처리 방법이 매우 효과적이다. 따라서 본 연구는 염소 생성 반응의 과전위 감소 및 산소발생을 억제하는 고순도 염소 제조 촉매기술에 대하여 발표하고자 한다. 또한, 전기화학 촉매를 이용한 위와 같은 연구는 물 전기분해 기술에도 적용 가능하다. 산화극의 전극 촉매 활성을 증가시켜 과전위 감소 및 고순도의 수소를 친환경적인 방법으로 제조하여 수소 제조단가를 감소시키는 응용 연구가 진행 중이다. ^** 본 연구는 산업통산자원부 지원 에너지기술개발사업(20153010041750) 및 기술혁신개발사업(10050509) 연구비 지원에 의하여 연구되었습니다.

수소 발생용 PEM형 수전해 연구 현황

문상봉(Sangbong Moon),최윤기(Yunki Choi),정혜영(Hyeyoung Jung),문창환(Changhwan Moon) 한국가스학회 2017 한국가스학회 학술대회논문집 Vol.2017 No.11

수소경제에서 PEM 수전해의 역할과 전망

문상봉 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0

2010년 독일의 에너지대전환, 2014년 일본의 수소사회 로드맵, 2019년 1월 우리나라 정부의 수소 경제로드맵 발표가 있었다. 수소 경제(사회) 로드맵은 2000년대 과거에도 있었지만 현재는 과거와 다른 면에서 전개되고 있다. 수소 경제에서 가장 중요한 것은 CO₂ free의 저렴한 수소 획득이다. 재생에너지 도입량이 커지면서(유럽의 사례) 전력 공급이 전력 수요를 넘을 때 싸진 전력 가격을 이용하여 값싼 수소를 CO₂ free하게 제조하는 것이 핵심이다. 이같이 얻은 재생에너지 유래 수소는 개질 수소 및 부생수소에 대하여 환경 및 가격 경쟁력이 확보될 전망이다. 본 발표에서는 재생전원과 수전해 연계를 위한 기본 요건(Key Process Indicator)에 대하여 소개를 하고, 우리나라에서 수행하고 있는 MW 전해조 개발 과제(에기평)의 연구 내용, 국외 기술들의 기술 수준 비교 및 그리고 향후 전망에 대하여 논의하고자 한다.

타이어-노면 소음 저감을 위한 소입경 골재노출 콘크리트포장의 굵은 골재 함량에 따른 노면조직의 특성 연구

문상봉,이승우,김재훈,김영규 한국도로학회 2019 한국도로학회논문집 Vol.21 No.1

PURPOSES : Exposed aggregate concrete pavements have been adopted in several countries because of their advantages of pavement texture characteristics, which can produce low tire-pavement noise and higher load-carrying capacities. The magnitude of tire-pavement noise greatly depends on the wavelength of pavement texture. The wavelength of exposed aggregate concrete pavement can be controlled with maximum sizing and by controlling the amount of coarse aggregates in the concrete mixture. In this study, the maximum size and the amount of coarse aggregate in the exposed aggregate concrete pavement are investigated to produce equal levels of wavelength in the asphalt pavement. METHODS: A simple method to measure the average wavelength of pavement texture is introduced. Subsequently, the average wavelength of typical asphalt pavement is investigated. A set of mixture designs of exposed aggregate concrete with three maximum-sized coarse aggregates, and three amounts of coarse aggregate are used. The average wavelengths are measured to find the mixture design needed to produce equal levels of wavelength as typical asphalt pavement. RESULTS : With a cement content of 420 kg/m3 and fine aggregate modulus of 30%, the number of exposed aggregates was 48, and the shortest texture depth provided a wavelength of 4.2 mm. According to the number of exposed aggregates, the exposed aggregate concrete pavement could be rendered low-noise, because its wavelength was similar to that of asphalt pavement ranging from 3.9 to 4.4 mm. CONCLUSIONS : Selection of appropriate maximum sizes and the amount of coarse aggregates for exposed aggregate concrete pavement can produce a wavelength texture closely resembling that of asphalt pavement. Therefore, the noise level of exposed aggregate concrete pavement can be reduced with an appropriate maximum size and the amount of coarse aggregates are employed.

LA마모시험과 마모가속시험을 이용한 노면 노출 굵은 골재의 마모 특성 연구

문상봉,김영규,이승우 한국도로학회 2020 한국도로학회논문집 Vol.22 No.1

PURPOSES : This study investigates the abrasion characteristics of coarse aggregate using the Los Angeles (L.A.) abrasion test and the accelerated polishing machine (APM) test. The coarse aggregates are randomly exposed on the surface of asphalt concrete pavements and on exposed aggregate concrete pavements. The exposed aggregates play a very important role in providing skid resistance. Therefore, the adequate abrasion resistance of coarse aggregate must be ensured to maintain the skid resistance during service life. In Korea, the LA abrasion test is conducted according to the KS F 2508 standard for the evaluation of the abrasion resistance of coarse aggregate. However, the road surface abrasion is caused by the friction between the tire and the road surface structure; hence, whether the LA abrasion test, which evaluates the abrasion caused by the impact of coarse aggregates and steel balls, can evaluate the road surface abrasion is questionable. A comparison and an analysis between the APM and LA abrasion tests were conducted herein to evaluate the road abrasion. An analysis was also performed to analyze whether the abrasion characteristics appeared depending on the type of coarse aggregate. METHODS: The results of the APM and LA abrasion tests for various aggregate types were obtained through a series of experiments and literature reviews. The correlation between the LA abrasion loss and the PV data was derived. In addition, the influence of the aggregate type on the abrasion resistance was investigated. RESULTS : An abrasion resistance database was established, and the relationship between the rock types and the abrasion resistance was statistically determined. The results showed that the PV was increased to 0.54 along with a 1% increasing rate of the LA abrasion loss with a 0.67 coefficient of determination. The abrasion resistance was also influenced by the aggregate type, which was found to be statistically significant. CONCLUSIONS: A good relationship between the PV and the LA abrasion loss was obtained, allowing the use of the LA abrasion test (KS F 2508) alone, to reasonably evaluate the abrasion resistance of the exposed aggregate texture. The aggregate types were also found to have an impact on the abrasion resistance.

양이온교환막 전해조의 최적화 연구

문상봉(Sang Bong Moon),박선원(Sun Won Park) 한국화학공학회 1996 화학공학의이론과응용 Vol.2 No.1