솔잎재 콘크리트의 강도 특성에 관한 실험적 연구

남기성 ( Nam Ki Sung ),성찬용 ( Sung Chan Yong ),김경태 ( Kim Kyung Tae ),김영익 ( Kim Young Ik ),서대석 ( Seo Dae Seuk ) 한국농공학회 1998 한국농공학회 학술대회초록집 Vol.1998 No.-

This study was to estimate the strength of pine needle ash concrete using cement, natural aggregates and pine needle ash(PNA). The highest strength was achieved by 5% pine needle ash filled PNA concrete respectively. It was increased 6% by compressive strength, 15% by tensile strength and 13% by bending strength than that of the normal cement concrete, respectively.

마당극의 몸미학

남기성(Ki-Sung Nam) 민족미학회 2007 민족미학 Vol.7 No.-

하천 현장에 타설된 레미콘의 공학적 특성

남기성 ( Nam Ki Sung ),성찬용 ( Sung Chan Yong ) 한국농공학회 2004 한국농공학회 학술대회초록집 Vol.2004 No.-

본 연구는 현장에서 사용되는 레미콘의 공학적 특성을 규명하였으며, 이 연구를 통해 얻어진 결과를 요약하면 다음과 같다. 1. 재령28일 압축강도 21MPa와 24MPa의 슬럼프는 출하전에는 12~13.5cm로 나타났고, 현장에 도착한 레미콘의 타설전 측정치는 11.5~12.5cm로 나타났으며, 온도상승으로 인한 슬럼프의 감소는 아주 미미하게 나타났다. 2. 콘크리트의 내부온도는 출하전 15~22℃, 현장 도착 후 타설전 측정온도는 17~27℃로 나타났다. 3. 재령28일의 압축강도 21MPa 와 24MPa를 기준으로 한 레미콘의 공기량은 출하전에는 3.2~5.4%의 범위로 나타났고, 현장 도착 후 공기량은 3.3~5.6%의 범위로 큰 차이는 나타나지 않았다. 4. 재령28일의 압축강도 21MPa 와 24MPa를 기준으로 한 레미콘의 염화물 함량은 0.3kgf/m³ 이하로 나타났으며, 출하전 과 현장 도착 후의 값은 거의 변동이 없는 것으로 나타났다. 5. 재령28일의 압축강도 21MPa을 기준으로 한 레미콘의 재령7일 압축강도는 14.1~16.2 MPa이었으며, 재령28일은 24.4~26.0MPa이었고, 재령28일의 압축강도 24MPa을 기준으로 한 레미콘의 재령7일 압축강도는 21.8~22.6MPa이었으며, 재령28일의 경우는 27.7~29.1MPa로 기준치보다 11~23%정도 크게 나타났다. This study was performed to evaluate engineering properties of ready mixed concrete(RMC) in the scene. The slumps of the RMC of compressive strength 21MPa(A) and 24MPa(B) at the curing age of 28days were 12 ~ 13.5cm and 11.5 ~ 12.5cm in before and after supplied in the scene, respectively. The temperatures of concrete inside were 15~22℃ and 17~27℃ in before and after supplied in the scene, respectively. The air contents of A and B were 3.2~5.4% and 3.3 ~5.6% in before and after suppled in the scene respectively. The chloride contents of A and B were 0.3kgf/m³ below and was not different in before and after supplied in the scene, respectively. The compressive strengths of A and B were 14.1 ~ 16.2MPa and 21.8~22.6MPa at the curing age of 7days, and were 24.4 ~ 26.0MPa and 27.7~29.1MPa at the curing age of 28days, respectively.

폴리프로필렌 섬유를 혼입한 레미콘의 강도 및 비파괴 시험

남기성 ( Nam Ki Sung ),윤동채 ( Youn Dong Chae ),윤여훈 ( Yoon Yeo Hoon ),성찬용 ( Sung Chan Yong ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-

This study is performed to evaluate the strength and non-fracture test of the ready mixed concrete(RMC) using polypropylene. The slump is reached in 8±2cm of each RMC using polypropylene or without polypropylene, air content is reached in 4.5±1.5%, the chloride content is below 0.3kg/m³. The compressive strength of RMC not using polypropylene is appeared over 210kgf/ cm² at the curing age 7 days and 239 kgf/ cm² at the curing age 28 days. The compressive strength of RMC using polypropylene is appeared over 188kgf/ cm² at the curing age 7 days and 238kgf/ cm² at the curing age 28 days. The dynamic modulus of elasticity of RMC not using polypropylene is appeared over 298x10³kgf/cm² at the curing age 7 days and 342X10³ kgf/cm² at the curing age 28 days. The RMC using polypropylene is appeared over 284 x 10³kgf/ cm² at the curing age 7 days and 238 x 10³kgf/ cm² at the curing age 28 days. 1he pulse velocity of RMC not using polypropylene is appeared over 4,198mjs at the curing age 7 days and 4,382m/s at the curing age 28 days. The RMC using polypropylene is appeared over 4,182mjs at the curing age 7 days and 4,342m/ s at the curing age 28 days.

환경오염에 의해 발생하는 열화인자 침투저감을 위한 EVA와 강섬유를 혼입한 콘크리트의 내구 특성

남기성 ( Ki-sung Nam ),전형순 ( Hyung-soon Jun ) 한국환경기술학회 2015 한국환경기술학회지 Vol.16 No.5

산업의 고도성장에 따라 발생하는 이산화탄소, 폐수 등과 같은 오염물질의 발생이 증가하고 있다. 이들 오염물질은 열화인자를 활성화시켜 콘크리트 내구연한을 감소시키고 있다. 시멘트 콘크리트 구조물의 내구성을 개선하기 위해 재유화형 폴리머 분말, 수용성 폴리머 등 혼화재료에 대한 연구가 진행되고 있으며, 현장에서는 보편적으로 사용하는 플라이애시, 고로슬래그 및 실리카 흄과 같은 혼화재료를 사용하고 있다. 특히, 재유화형 EVA 분말수지는 경화과정에서 콘크리트 내의 공극과 모세구조를 메워주는 특징을 지고 있어 방수성, 접착성이 필요한 보수·보강재료로 사용하고 있으며, 시멘트와 같이 포대로 저장 가능하기 때문에 운반과 이용이 편리한 장점을 지니고 있다. 시멘트 콘크리트는 압축력에 대한 저항성은 우수하나 인장, 전단 및 휨에 대한 저항성이 상대적으로 작아 균열이 발생하기 용이하기 때문에 강섬유 및 폴리프로필렌 섬유 등과 같은 보강 재료를 사용하여 이들 단점을 개선하고 있다. 따라서 본 연구에서는 현장에서 사용하고 있는 플라이 애시를 혼입한 레미콘 배합을 기초로 하여 EVA와 강섬유를 결합한 강섬유 보강 EVA 콘크리트를 개발하였으며, EVA와 강섬유 혼입에 따른 내구적 특성을 알아보기 위해 흡수율, 염소이온 투과 저항성, 건조수축 및 내산성 시험을 실시하였고, 그 결과는 다음과 같다. 흡수율 저감효과와 염소이온 투과 저항성이 EVA 5.0%를 혼입하고 강섬유 혼입률 0.6%에서 가장 효과적이었다. 건조수축변형률 저감과 내산성은 EVA 5.0%를 혼입하고 강섬유 혼입률 1.0% 에서 가장 우수하였다. 이와 같은 결과로 EVA와 강섬유를 적정량 사용한다면 콘크리트 구조물의 내구성이 향상에 콘 도움이 되리라 사료된다. According to the rapid growth of industry, it had increased pollutants such as carbon dioxide and waste water. These pollutants were generating deterioration factors and decreasing the life of concrete structures. It has been conducted on the study for admixture such as redispersible polymer powder and water-soluble polymer to improve the durability of cement concrete structures, the admixtures as fly ash, blast furnace slag and silica fume was extensively used in site. Especially, EVA(Ethylene-Vinyl Acetate) redispersible polymer powder was used as a maintenance and reinforced material to improve waterproofing and adhesiveness, had the properties filling the concrete pores and capillary structure and had the advantages for transportation and usability. Cement concrete was very excellent in resistance to compressive force but because resistance for tensile, shear and flexural force was very weak, crack was occurred in the concrete structures and reinforcing materials such as steel and polypropylene fiber were used to compensate these weakness. In this study, the steel fiber reinforced EVA concrete was developed on the basis of ready mixed concrete that mixed the fly ash in site and the experiment of water absorption ratio, chloride ion penetration resistance and acid resistance was performed to evaluate durable characteristics of concrete with EVA and steel fiber contents. The results of these tests had been drawn; The reduction of water absorption ratio and chloride ion penetration resistance showed the most effective in 5% of EVA contents and 0.6% of steel fiber contents. The reduction of dry shrinkage strain and acid resistance showed the most excellent in 5% of EVA contents and 1.0% of steel fiber contents. From these results, We considered that the durability of concrete structures was greatly improved, if we used appropriate amount of EVA and steel fibers.

현장에 타설된 레미콘의 물리·역학적 특성

남기성 ( Nam Ki-sung ),성찬용 ( Sung Chan-yong ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-

This study is performed to properties of ready mixed concrete (RMC) in site. The unit weight of the B company's RMC is range from 2,308 kg/㎥ to 2,355 kg/㎥ and that of the J company's RMC is range from 2,888 kg/㎥ to 2,310 kg/㎥. The compressive strength of B company's RMC of curing age of 7 days is range from 191kgf/㎠ - 232kgf/㎠ and that of curing age of 28days is 273kgf/㎠ ~ 306kg/㎠. The compressive strength of J company's RMC of curing age of 7 days is range from 151kgf/㎠ ~ 177kgf/㎠ and that curing age of 28 days is range from 215kgf/㎠ ~ 234kgf/㎠. The B and J company's air content is range of 3.2 ~ 5.2%. The content of Chloride of the Band J company's is range from each 0.026 kg/㎥ ~ 0.046 kg/㎥ and 0.034 kg/㎥ ~ 0.069kg/㎥, respectively.

솔잎재 콘크리트의 탄성특성 및 내산성에 관한 실험적 연구

남기성 ( Nam Ki Sung ),민정기 ( Min Jeong Ki ),김영익 ( Kim Young Ik ),서대석 ( Seo Dae Seuk ),이전성 ( Lee Jeon Sung ),성찬용 ( Sung Chan Yong ) 한국농공학회 1999 한국농공학회 학술대회초록집 Vol.1999 No.-

This study is performed to evaluate an elastic properties and acid-resistance of concrete using pine needle ash(PNA). Materials used for this experiment are PNA, normal portland cement, natural fine and coarse aggregate. Test results show that the highest ultrasonic pulse velocity, dynamic and static modulus of elasticity is achieved by 5% PNA filled PNA concrete, which has showed similar with those of the normal cement concrete. Acid-resistance of PNA concrete is increased with increase of the content of PNA, it is 1.29 times of the normal cement conrete by 5% PNA filled PNA concrete and 2.57times by 15% PNA filled PNA concrete. Accordingly, PNA concrete will greatly improve the properties of concrete.

폴리프로필렌 섬유 보강 EVA 콘크리트의 압축강도 및 내구성

남기성,성찬용,Nam, Ki Sung,Sung, Chan Yong 한국농공학회 2015 한국농공학회논문집 Vol.57 No.4

The important properties of EVA (ethylene vinyl acetate) redispersible polymer was waterproof, densification of internal pore space of concrete and ball bearing and micro filler. Also, the significant role of polypropylene(PP) fiber was crack control and blockade of movement for deterioration factors. The most studies for EVA were limited in the field of mortar and PP fiber reinforced concrete had been studied in the state of being restricted unit water content, rich mix and mixing much of the fiber without considering construction site. Therefore, the control mix design were applied in ready mixed concrete using 10 % fly ash of total cement weight used in batch plant. On the basis of control mix design, EVA contents ranging from 0 % to 10 % of total cement weight and PP fiber contents ranging from 0 % to 0.5 % of EVA concrete volume were used in the mix designs. The results showed the maximum compressive strength value was measured at EVA 5.0 % and PP fiber 0.1 %, the minimum water absorption ratio was at EVA 10 % and PP fiber 0 %, the durability factor for freezing and thawing resistance was at EVA 5.0 % and PP fiber 0.3 % and the minimum weight reduction ratio of resistance to sulfuric acid attack was at EVA 10 % and PP fiber 0.5 % after curing age 42days. Meanwhile, From these results, PP fiber reinforced EVA concrete would be very benefit, if each optimal mix types were used in hydraulic structures, underground utilities and agricultural structures.

폴리프로필렌 섬유보강 화강토 콘크리트의 역학적 특성

남기성,전형순,Nam, Ki Sung,Jun, Hyung Soon 한국농공학회 2013 한국농공학회논문집 Vol.55 No.1

This study will not only prove experimental dynamic properties which are classified to slump, compressive strength, tensile strength, flexure strength and toughness granite soil concrete with a fine aggregate of granite soil and blast-furnace cement and polypropylene fiber over 45 mm, but also establish a basic data in order to use environment-friendly pavement through prove useful pavement mixed with granite and polypropylene (PP) fiber which is a kind of material to prevent a dry shrinkage clack, a partial destruction and useful and light. The value of slump test was gradually increased by PP fiber volume 3 $kgf/m^3$, but compressive strength took a sudden turn for the worse from 5 $kgf/m^3$. The compressive strength indicated a range of 13.72~18.35 MPa. On the contrary to compressive strength, the tensile strength showed to decrease with rising PP fiber volume, and the tensile strength indicated a range of 1.43~1.64 MPa. The tensile strength was stronger about 2~15 % in case of mixing with PP fiber volume than normal concrete. The flexural strength indicated a range of 2.76~3.41 MPa. The flexural strength was stronger about 20 % in case of PP fiber volume 0 $kg/m^3$ than PP fiber volume 9 $kg/m^3$. The toughness indicated a range of 0~25.46 $N{\cdot}mm$ and increased proportionally with PP fiber volume. The toughness was stronger about 8.3 times in case of PP fiber volume 9 $kg/m^3$ than PP fiber volume 1 $kg/m^3$. The pavement with PP fiber volume over such a fixed quantity in the park roads and walkways can have a effect to prevent not only resistance against clack but also rip off failures.

폴리프로필렌 섬유보강 EVA 콘크리트의 휨 성능

성찬용,남기성,Sung, Chan Yong,Nam, Ki Sung 한국농공학회 2016 한국농공학회논문집 Vol.58 No.2

This study was performed to evaluate the effective analysis of flexural performance for polypropylene fiber (PF) reinforced EVA concrete that can be used in marine bridge, tunnel and agricultural structures under flexural load. The control design was applied in ready mixed concrete using 10 % fly ash of total binder weight used in batch plant. On the basis of the control mix design, there was designed mix types that contained PF ranged from 0 % to 0.5 % by volume ratio into two mix types of using 0 % and 5.0 % EVA contents of total binder weight. Before evaluating the flexural performance, we tested compressive strength and flexural strength to evaluate whether polypropylene fiber reinforced concrete could be used or not in site. The method of flexural performance evaluation was applied by ASTM C 1609. These results showed the maximum compressive strength and flexural strength was measured at each E5P1 and E5P2. Concrete reinforced with PF exhibited deflection-softening behavior. In the concrete reinforced with 0.4 % PF contents and containing 5.0 % EVA, the flexural performance was the best.