C_aCO₃와 석분을 혼입한 투수용 폴리머 콘크리트의 공학적 성질

성찬용,송용진,정현정,Sung, Chan Yong,Song, Young Jin,Jung, Hyun Jung 충남대학교 농업과학연구소 1996 농업과학연구 Vol.23 No.1

This study was performed to evaluate the engineering properties of permeable polymer concrete with fillers and unsaturated polyester resin. The following conclusions were drawn. 1. The highest strength was achieved by stone dust filled permeable polymer concrete, it was increased 17% by compressive, 148% by tensile and 188% by bending strength than that of the normal cement concrete, respectively. 2. The static modulus of elasticity was in the range of $1.17{\times}10^5{\sim}1.32{\times}10^5kg/cm^2$, which was approximately 53~56% of that of the normal cement concrete. Stone dust filled permeable polymer concrete was showed relatively higher elastic modulus. The poisson's number of permeable polymer concrete was less than that of the normal cement concrete. 3. The dynamic modulus of elasticity was in the range of $1.3{\times}10^5{\sim}1.5{\times}10^5kg/cm^2$, which was approximately less compared to that of the normal cement concrete. Stone dust filled permeable polymer concrete was showed higher dynamic modulus. The dynamic modulus of elasticity were increased approximately 10~13% than that of the static modulus. 4. The water permeability was in the range of $3.076{\sim}4.390{\ell}/cm^2/h$, and it was largely dependent upon the mix design. These concrete can be used to the structures which need water permeability. 5. The compressive strength, tensile strength, bending strength and elastic modulus were largely showed with the decrease of water permeability. 이 연구는 폴리머와 충전재로 $CaCO_3$와 석분을 혼입한 투수용 폴리머 콘크리트의 공학적 성질을 구명한 것으로서, 이 연구를 통해 얻어진 결과를 요약하면 다음과 같다. 1. 강도는 충전재로 석분을 100% 혼입한 투수용 폴리머 콘크리트에서 가장 크게 나타났으며, 보통 시멘트 콘크리트보다 압축강도에서는 17%, 인장강도에서는 148%, 휨강도에서는 188% 증가되었고, 압축강도에 대한 인장과 휨강도비가 보통 시멘트 콘크리트보다 2.1~2.5배이상 크게 나타나 취성이 크다는 것을 알 수 있었다. 2. 정탄성계수는 $1.17{\times}10^5{\sim}1.32{\times}10^5kg/cm^2$로서 보통 시멘트 콘크리트의 53~56%정도로 변형성이 크게 나타났고, 충전재로는 석분을 100% 혼입한 투수용 폴리머 콘크리트에서 비교적 높은 값을 보였으며, 포아손수는 보통 시멘트 콘크리트보다 작게 나타났다. 3. 동탄성계수는 $1.3{\times}10^5{\sim}1.5{\times}10^5kg/cm^2$로서 보통 시멘트 콘크리트보다 작게 나타났고, 충전재로는 석분을 100% 혼입한 투수용 폴리머 콘크리트에서 비교적 높은 값을 보였으며, 동탄성계수는 정탄성계수보다 10~13%정도 크게 나타났다. 4. 투수량은 $3.076{\sim}4.390{\ell}/cm^2/h$로서 배합설계에 따라 크게 좌우되었으며, 이러한 콘크리트는 투수를 요하는 구조물에 유용하게 이용할 수 있을 것이다. 5. 투수량은 압축강도, 인장강도, 휨강도 및 탄성계수가 증가할수록 감소하였다.

굴 패각 분말을 충전재로 활용한 폴리머 콘크리트의 강도 및 내구 특성

성찬용,김영익,Sung, Chan-Yong,Kim, Young-Ik 한국농공학회 2010 한국농공학회논문집 Vol.52 No.6

This study was performed to evaluate the workability, strengths and durability of polymer concrete using oyster shell that are reclaimed at public shore illegally or leaved on the surroundings of shore to prevent the environmental pollution. We investigated the effect of oyster shell powder (OSP) and $CaCO_3$. on the slump, compressive strength, flexural strength, acid sulfuric and freezing and thawing resistance as a filler of polymer concrete. Modified OSP obtained by crushing oyster shell (less than 0.15 mm size) consists of 60.47 wt% of $SiO_2$ and 39.5 wt% of $CaCO_3$. As a result of slump test by OSP and $CaCO_3$. contents, it is found that slump of specimen used OSP is lower than that used $CaCO_3$. and the more OSP contents are, its slump is increased. Compressive and flexural strength of polymer concrete using OSP are similar or slightly lower than that using $CaCO_3$. In acid sulfuric test for 5 % $H_2SO_4$ and freezing thawing test, regardless of kinds of fillers and contents are not found fatal defects in weight change, falling-off in surface and durability factor.

다도해해상국립공원 내 섬 지역의 빛공해 유발 요인 분석

성찬용,Sung, Chan Yong 한국환경생태학회 2022 한국환경생태학회지 Vol.36 No.4

빛공해는 연안 및 섬 지역의 생태계를 교란하는 요인 중 하나이다. 본 연구는 야간 위성영상을 이용하여 다도해해상국립공원 내 섬 지역의 빛공해를 일으키는 요인을 분석하였다. 분석은 다도해해상국립공원 내 섬 중 면적이 10만m² 이상인 101개 섬을 대상으로 하였다. 연구 대상 섬의 빛공해 수준은 2019년 1월과 4월, 8월, 10월 DNB monthly 영상에 기록된 야간 빛방사량으로 측정하였다. 연구 대상 섬의 야간 빛방사량을 다도해해상국립공원의 7개 지구별로 비교하면, 금오도지구가 17,666nW/m²/sr로 가장 높았고, 거문도·백도지구, 나로도지구, 소안도·청산도지구가 뒤를 이었다. 계절별로는 10월의 야간 빛방사량이 9,509nW/m²/sr로 가장 높았고, 다음으로 8월, 1월, 4월 순이었다. 연구 대상 섬의 빛공해 수준에 영향을 미치는 요인을 회귀분석을 통해 분석한 결과, 섬에서 반경 5km 내 지역의 건축물 연면적과 등대 개소수는 모든 시기에서 야간 빛방사량에 통계적으로 유의미하게 영향을 미쳤지만, 섬 내부의 건축물 연면적과 등대 개소수는 대부분 시기에 영향을 미치지 않아, 개발이 제한된 국립공원 내 섬 지역에서는 공원 내부보다 인근 지역의 인공조명의 영향이 큰 것을 알 수 있었다. 단, 8월에는 예외적으로 섬 내부의 건축물 연면적이 섬의 야간 빛방사량에 유의미한 영향을 미쳤는데, 이는 휴가철 탐방객이 사용하는 인공조명의 영향으로 보인다. 섬의 크기는 섬의 빛공해 수준에 음(-)의 영향을 미쳤는데, 이는 빛공해가 일종의 생태적 경계효과임을 보여주는 결과이다. 즉, 작은 섬일수록, 섬 전체 면적 중 인접 지역에서 방사된 빛의 영향을 받는 경계 지역의 면적이 상대적으로 넓기 때문이다. 본 연구의 결과는 해상형 국립공원 내 섬 지역의 빛공해 저감을 위해서는, 섬 인근 지역의 인공조명 관리가 필요하다는 것을 시사한다. Light pollution is one of the factors that disturb coastal and island ecosystems. This study examined the factors causing light pollution in the islands in Daedohaehaesang National Park using nighttime satellite images. This study selected 101 islands with an area of 100,000 m² or more in Daedohaehaesang National Park, and measured the levels of light pollution of the selected islands by calculating mean nighttime radiance recorded in VIIRS DNB monthly images for January, April, August, and October 2019. Of seven districts of the park, The highest mean nighttime radiance was recorded in Geumodo district (17,666nW/m²/sr), followed by Geonumdo·Baekdo, Narodo, Soando·Cheongsando districts. By season, mean nighttime radiance in October was the highest at 9,509nW/m²/sr, followed by August, January, and April. Regression analyses show that the total floor area and the number of lighthouses in a 5 km buffer area had a statistically significant effect on mean nighttime radiance at all times, but those within the island did not, indicating that light pollution in islands in a national park where land development is strictly restricted is influenced by artificial lights in nearby areas. However, the total floor area of an island significantly affected mean nighttime radiance only in August, which appears to be attributed to the impact of intensive use of artificial light by visitors during summer vacation. The size of an island had a negative (-) effect on nighttime radiance. This negative effect suggests that light pollution is a type of ecological edge effect, i.e., the smaller island is more likely to have a relatively larger proportion of edge area that is affected by light emitted from the neighboring areas. The results of this study indicate that managing artificial lights in nearby areas is necessary to mitigate light pollution in islands in marine and coastal national parks.

결합재량에 따른 포러스 폴리머 콘크리트의 공극률과 강도 및 식생 블록 내 초기 생장 특성

성찬용,김영익,Sung, Chan-Yong,Kim, Young-Ik 한국농공학회 2010 한국농공학회논문집 Vol.52 No.6

This study was performed to evaluate the void ratio and strength of porous polymer concrete used coarse aggregates and unsaturated polyester resin to find optimum mix design of porous polymer concrete for planting block. Also, this study was performed to evaluate the planting properties of herbaceous plant and cool-season grass in porous polymer blocks based on the experimental results of porous polymer concrete to develop environmentally friendly planting blocks. Tests for the void ratio and compressive strength of porous polymer concrete were performed at the curing age 7 days. Also, kinds of plants such as Tall fescue, Perennial ryegrass, Lespedeza and Alfalfa for planting were applied to porous polymer blocks. Within 6 weeks after seed, initial germination ratio, cover view and growth length for planting blocks were estimated by various methods.

재생골재를 사용한 폴리머 콘크리트의 강도 특성

성찬용,백승출,Sung, Chan-Yong,Back, Seung-Chul 한국농공학회 2005 한국농공학회논문집 Vol.47 No.4

This study was performed to evaluate the strength properties of polymer concrete using recycled aggre-gate. The compressive strength, splitting tensile strength, flexural strength and pulse velocity of polymer concrete were decreased with increasing the content of recycled aggregate. At the curing age of 7days, the compressive strength was $80.5\~88.3$ MPa, the splitting tensile strength was $9.1\~10.6$ MPa, the flexural strength was $19.2\~21.5$ MPa and the pulse velocity was $3,931\~4,041$ m/s, respectively. Also, the compressive strength, splitting tensile strength, flexural strength and pulse velocity of concrete using recycled fine aggregate were higher than that of the silica sand. Therefore, these recycled aggregate polymer concretes were estimated for high strength concrete without major problem.

폐타이어 칩 및 에폭시를 활용한 탄성 복합체의 개발 - 강도와 내구성을 중심으로 -

성찬용,노진용,Sung, Chan Yong,Noh, Jin Yong 한국농공학회 2016 한국농공학회논문집 Vol.58 No.1

This study was performed to evaluate the strength and durability properties of modified epoxy composites with waste tire chip, recycled coarse aggregate, filler and modified epoxy to improve elongation and elasticity of epoxy. Additionally, for comparing to modified epoxy and unsaturated polyester resin as a binder, unsaturated polyester resin composites were developed in the same condition. The mix proportions were determined to satisfy the requirement for the workability and slump according to aggregate size and binder content. Tests for the compressive and flexural strength, freezing and thawing and durability for 20 % sulfuric solution were performed. The compressive and flexural strength of modified epoxy composites were in the range of 34.9~61.6 MPa and 10.2~18.3 MPa at the curing 7 days, respectively. Also, the compressive and flexural strength of unsaturated polyester resin composites were in the range of 44.2~77.8 MPa and 11.3~20.8 MPa at the curing 7 days, respectively. After 300 cycles of freezing and thawing, weight decrease ratio and durability factor of modified epoxy composites were in the range of 0.8~1.9 % and 95~98, respectively. Accordingly, modified epoxy composites will greatly improve the durability of concrete.

재생굵은골재를 사용한 고강도 콘크리트의 동결융해 특성

성찬용,임상혁,Sung , Chan-Yong,Im , Sang-Hyuk 한국농공학회 2004 한국농공학회논문집 Vol.46 No.2

This study was performed to evaluate the freezing and thawing properties of the high strength concrete using recycled coarse aggregate. The recycled coarse aggregate replaced natural crushed aggregate by 0%, 25%, 50%, 75% and 100%. The compressive strength of the concrete using recycled coarse aggregate showed more than 300 kgf/$cm^2$ at the curing age 28 days. The mass loss ratio by freezing and thawing was less than 1% at all mix type. The relative dynamic modulus of elasticity was decreased with increasing the freezing and thawing cycles. Also, the durability factor by the freezing and thawing was decreased with increasing the content of recycled coarse aggregate. But, the recycled concrete except 100% recycled coarse aggregate showed 60 or more durability factor in the freezing and thawing 300 cycles. Accordingly, these recycled coarse aggregate can be used for high strength concrete.

기계화를 전제로한 산간경사지답 경지정리 방안에 관한 연구

성찬용,황근,한욱동,Sung, Chan-Yong,Hwang, Eun,Han, Wook-Dong 한국농공학회 1981 한국농공학회논문집 Vol.23 No.2

The paddies in the hillsides in Gonggeun-myeon, Hoingseong-gun, Kangweon-do keep a steep slope and run in and out. A land consolidation in such an area, therefore, will require high ratio of land loss and a large amount of earth moving if it follows the existing design criteria to separate drainage and irrigation ditches in a scheme. Due to the consequent decrease in construction cost, the project has not been envisaged. in order to secure the introduction of small-medium size farm machineries into the paddies, farm plots were planned to be straight and drainage with taking care of topography. Findings from the comparison of methodologies are as follows. 1. In places with a solpe of more than 1/30, a reduction in earth moving can be expected with parallel plots to the contours. 2, For the sake of effective using of farm machineries, it is thought that a plot should be running straight parallel to the contours and the ratio of length and width of a plot be more than six. 3. In places with a slop of more than 1/10, a reduction in earth moving and a effective introduction of farm-machineries can he expected with straight parllel plots to the contours. But it is undesirable to introduce a scheme in this places because of the difficulties in acreage computation and farmers' hesitation. 4. The system with a canal for both irrigation and drainage is highly effective to decrease the ratio of land loss as well as construction cost. 5. Parallel plots to the contours and a canal for both irrigation and drainage are highly effective in the decrease in construct cost. 6. To avoid the subdivision of a cooperation in farming is desirable of a plots, has more than two owners.

폴리프로필렌 섬유보강 환경친화형 포장재료의 개발

성찬용,김영익,Sung, Chan-Yong,Kim, Young-Ik 한국농공학회 2004 한국농공학회논문집 Vol.46 No.1

This study is performed to examine the physical and mechanical properties of eco-concrete using soil, natural coarse aggregate, excellent soil compound and polypropylene fiber. The test result shows that mass loss ratio is decreased with increasing the content of coarse aggregate and excellent soil compound. The compressive and flexural strengths are increased with increasing the content of coarse aggregate, excellent soil compound and polypropylene fiber. The coefficient of permeability is decreased with increasing the content of coarse aggregate and excellent soil compound, but it is increased in 0.2% polypropylene fiber content. The lowest coefficient of permeability is showed in $5.066\times 10^{-9}$cm/s. These eco-concrete can be used for farm road.

기포제(起泡劑)를 사용(使用)한 모르터의 제특성(諸特性)에 관(關)한 연구(硏究)

성찬용,Sung, Chan Yong 충남대학교 농업과학연구소 1988 Korean Journal of Agricultural Science Vol.15 No.1

이 논문(論文)은 기포(起泡)모르터의 제특성(諸特性)에 관(關)한 기초자료(基礎資料)를 제공(提供)하고져 수행(遂行)되었는 바, 이 연구(硏究)를 통(通)하여 얻어진 결과(結果)를 요약(要約)하면 다음과 같다. 1. 각(各) 기포(氣泡)모르터에서 물-시멘트비는 당배합비(富配合比)일수록, 기포제(起泡劑) 및 기포(氣泡)의 첨가량(添加量)이 증가(增加)할수록 감소(減少)하였으며, 보통(普通)시멘트 모르터에 비(比)하여 혼합기포주입형(混合氣泡注入型)은 1.6~53.1%, 사전기포주입형(事前氣泡注入型)은 4.4~24.1%의 물-시멘트비(比)가 감소(減少)되었다. 2. 각(各) 기포(氣泡)모르터의 밀도(密度)는 빈배합(貧配合)일수록, 기포제(起泡劑) 및 기포(氣泡)의 첨가량(添加量)이 증가(增加)할수록 작게 나타났으며, 밀도(密度)의 감소율(減少率)은 당배합(富配合)일수록, 기포제(起泡劑) 및 기포(氣泡)의 첨가량(添加量)이 증가(增加)할수록 크게 나타났다. 3. 기포(起泡)모르터는 보통(普通)시멘트 모르터에 비(比)하여 혼합기포주입형(混合氣泡注入型)은 38.8~55.9%, 사전기포주입형(事前氣泡注入型)은 9.7~23.6%의 자중감소(自重減少)를 보였다. 4. 각(各) 기포(起泡)모르터의 급수율(吸水率)은 빈배합(貧配合)일수록, 기포제(起泡劑) 및 기포(氣泡)의 첨가량(添加量)이 증가(增加)할수록 높게 나타났으며, 흡수율(吸水率)의 증가율(增加率)은 당배합(富配合)일수록, 기포제(起泡劑) 및 기포(氣泡)의 첨가량(添加量)이 증가(增加)할수록 크게 나타났다. 5. 72시간(時間) 수침(水浸)에서 각(各) 기포(氣泡)모르터의 흡수율(吸水率)은 보통(普遇)시멘트 모르터에 비(比)하여 혼합기포주입형(混合氣泡注入型)은 3.41~5.85배(倍)로 나타났으며, 사전기포주입형(事前氣泡注入型)은 1.05~1.55배(倍)로 나타났으며, 흡수율(吸水率)의 변화율(變化率)은 모두 수침초기(水浸初期)에 높게 나타나는 경향(傾向)을 보였다. 6. 각(各) 기포(氣泡)모르터의 각(各) 강도(强度)는 빈배합(貧配合)일수록, 기포제(起泡劑) 및 기포(氣泡)의 첨가량(添加量)이 증가(增加)할수록 작게 나타났으며, 각(各) 강도(强度)의 감소율(減少率)은 빈배합(貧配合)일수록, 기포제(起泡劑)나 기포(氣泡)의 첨가량(添加量)이 증가(增加)할수록 크게 나타났다. 7. 기포(氣泡)모르터는 보통(普通)시멘트 모르터에 비(比)하여 재령(材齡) 28일(日)에서 혼합기포주입형(混合氣泡注入型)은 77.0~92.8%, 사전기포주입형(事前氣泡注入型)은 36.7~74.4%의 강도감소(强度減少)를 보였고, 각(各) 기포(氣泡)모르터의 각(各) 강도간(强度間)의 상관관계(相關關係)는 직선형(直線形)으로 나타났으며 고도(高度)의 유의성(有意性)이 인정(認定)되었다. 8. 각(各) 기포(氣泡)모르터의 공기량(空氣量)은 빈배합(貧配合)일수록, 기포제(起泡劑)나 기포(氣泡)의 첨가량(添加量)이 증가(增加)할수록 크게 나타났으며, 공기량(空氣量)이 증가율(增加率)은 당배합(富配合)일수록, 기포제(起泡劑)나 기포(氣泡)의 첨가량(添加量)이 증가(增加)할수록 높게 나타났다. 9. 기포(氣泡)모르터의 공기량(空氣量)은 보통(普通)시멘트 모르터에 비(比)하여 혼합기포주입형(混合氣泡注入型)은 26.0~63.8배(倍), 사전기포주입형(事前氣泡注入型)은 5.8~17.7배(倍)를 보였다. 10. 각(各) 기포(氣泡)모르터에서 밀도(密度)와 흡수율(吸水率), 압축강도(壓縮强度) 및 공기량(空氣量)과의 상관관계(相關關係)는 매우 높은 유의성(有意性)을 보였고, 배합비(配合比)와 기포제( This study was performed to obtain the basic data which can be applied to use of foaming mortars. The results obtained were summarized as follows ; 1. The lowest water-cement ratios were shown at the mixing ratio of 1 : 1. But, it was gradually increased in poorer mixing ratio and decreased in more addition of foaming agent. The water-cement ratios were decreased up to 1.6-53.1% by mix-foaming type and 4.4-24.1% by pre-foamed type than cement mortar. 2. The highest bulk densities were shown at the mixing ratio of 1 : 1. But, it was gradually decreased in poorer mixing ratio and more addition of foaming agent. The decreasing rates of bulk densities were increased in richer mixing ratio and more addition of foaming agent. 3. The bulk densities were decreased up to 38.8-55.9% by mix-foaming type and 9.7-23.6% by pre-foamed type than cement mortar. 4. The lowest absorption rates were shown at the mixing ratio of 1 : 1. But, it was gradually increased in poorer mixing ratio and more addition of foaming agent. The increasing rates of absorption rates were increased in richer mixing ratio and more addition of foaming agent. 5. Absorption rates when immersed in 72hours were shown up to 3.41-5.85 times greater by mix-foaming type and 1.05-1.55 times greater by pre-foamed type than those of cement mortar. it was significantly higher at the early stage of immersed time than cement mortar. 6. The highest strengths were shown at the mixing ratio of 1 : 1. But, it was gradually decreased in poorer mixing ratio and more addition of foaming agent. The decreasing rates of strengths were increased in poorer mixing ratio and more addition of foaming agent. 7. The strengths were decreased up to 77.0-92.8% by mix-foaming type and 36.7-74.4% by pre-foamed type than cement mortar. 8. The lowest air contents were shown at the mixing ratio of 1 : 1. But, it was gradually increased in poorer mixing ratio and more addition of foaming agent. The increasing rates of air contents were increased in richer mixing ratio and more addition of foaming agent. 9. Air contents were shown up to 26.0-63.8 times greater by mix-foaming type and 5.8-17.7 times greater by pre-foamed type than those of cement mortar. 10. The correlations between bulk density, absorption rate, compressive strength and air content were highly significant. The multiple regression equations of bulk density, absorption rate, compressive strength, tensile strength, bending strength and air content were computed depending on a function of mixing ratio and addition of foaming agent. They were generally highly significant.