CSA를 사용한 친환경 지반보수용 현장 기포콘크리트의 기초 특성 검토

우양이,박근배,마영,송헌영,Woo, Yang-Yi,Park, Keun-Bae,Ma, Young,Song, Hun-Young 한국자원리싸이클링학회 2020 資源 리싸이클링 Vol.29 No.1

This study aimed to develop a foam concrete material for a ground repair system that has low strength and low fluidity by using an eco-friendly binder, which substitutes industrial by-products for more than 90% of cement. Basic properties were evaluated after substituting a small amount of calcium sulfo aluminate (CSA) for the binder to improve the sinking depth rate and volume change, commonly found when it had a large amount of industrial by-products. The substitution rates of CSA for the eco-friendly binder used for the foam concrete were 2.5, 5, and 10%. Fresh properties, hardened properties, pore structure, and hydrates were analyzed. Experimental results showed that using only 2.5% of CSA could improve the deep sinking depth which occurred when using an eco-friendly binder. As a result, the weight difference between the upper, middle, and lower parts of cast specimens was improved even after being hardened. The addition of CSA also contributed to the formation of small, uniformly sized closed pores and improved initial strength. However, when the proportion of CSA increased, the long-term strength decreased. However, it satisfied the target strength when 5% or less of CSA was used. The results of this study revealed that it was possible to manufacture foam concrete with low strength and high fluidity for repairing ground satisfying target qualities by adding 2.5% of CSA to the eco-friendly binder containing a large amount of industrial by-products.

고화재 종류와 적용 분야 및 기술 현황

이승헌,우양이,조도영,Lee, Seung-Heun,Woo, Yang-Yi,Cho, Do-Young 한국건설순환자원학회 2015 한국건설순환자원학회지 Vol.10 No.2

지반 함몰 복구용 저강도·고유동 충전재로서 기포콘크리트 연구 및 현장적용

마영,김범석,우양이,정경헌,송헌영,Ma, Young,Kim, Beom-Seok,Woo, Yang-Yi,Jung, Kyung-Hun,Song, Hun-Young 한국자원리싸이클링학회 2020 資源 리싸이클링 Vol.29 No.1

The objectives of this study were to identify the optimal mix of foam concrete with the low-strength and high-flow for the repairing ground subsidence situation emergently by utilizing a large amount of industrial by-products and evaluate the possibility by applying it to the site. The factors of the experiment were the mixing ratio of mixing water and a foaming agent and the mixing ratio of foam over paste volume. The optimal mix identified by the experiment was applied to the field and basic properties were evaluated. The results of the experiment showed that the optimal mixing ratio of mixing water and the foaming agent was 10%. Moreover, when the mixing ratio of pre-foam over paste volume was 170%, it satisfied the target. However, to ensure stable quality when applying to the field, the foam mixing ratio was set 140% for the field application. The field application test of foam concrete with the low-strength and high-flow using an eco-friendly binder satisfied all target performances. Therefore, the possibility of using it as a mixture and construction method for a ground repair system is confirmed. However, there was a quality deviation between the upper part and the lower part due to the separation between foam and paste. Consequently, further studies are needed to improve it.

폴리실리콘 슬러지를 원료로 사용한 포틀랜드 시멘트 클링커의 특성

이승헌,이세진,우양이,박정수,Lee, Seung-Heun,Lee, Se-Jin,Woo, Yang-Yee,Park, Jeoung-Soo 한국건설순환자원학회 2014 한국건설순환자원학회 논문집 Vol.2 No.4

본 연구는 태양광 소재인 폴리실리콘 제조시 부산되는 슬러지를 시멘트 클링커의 원료로서 사용 가능성에 대해 검토하였다. 시멘트 클링커를 제조 할 때, 폴리실리콘의 염소 성분이 소성과정에서 광화제로 작용하여 f-CaO 생성량을 낮추고, 시멘트 클링커 광물 중 $C_3S$ 생성량을 증가시킨 것으로 평가되었다. 또한 제조한 시멘트의 물리적 특성을 측정하였다. 제조 시멘트는 폴리실리콘 슬러지 함유량이 증가할수록 응결 시간을 단축시켰다. 이러한 결과는 염소 성분이 수화촉진제로써 작용해서 $C_3S$의 수화에 의해서 생성된 수산화칼슘의 용해를 촉진하기 때문이다. 또한 이러한 이유로 재령 1일에서의 모르타르 압축강도는 폴리실리콘 슬러지 함유량이 많을수록 컸다. 재령 3, 7, 28일 압축강도는 폴리실리콘 슬러지 첨가량 5wt%까지 증진되는 경향을 나타냈다. 이러한 이유는 클링커 제조 시 염소 성분이 $C_3S$ 광물 생성량을 증가시킴으로 3일 이후 압축강도를 증진시킨 것이다. This study reviewed the usability of sludge, a material that is additionally created when polysilicon (a solar light material) is produced, as the raw material for cement clinker. It was evaluated that when cement clinker is produced, the chloric component of polysilicon acted as a mineralizer in the firing process. In addition, the physical features of the produced cement were measured. The setting time of the produced cement was reduced as the amount of content of polysilicon sludge increased. Such results were drawn because the chloric component acted as hydration accelerator and enhanced the dissolution of calcium hydroxide that was formed by hydration of $C_3S$. Furthermore, for such reason, on the day 1, the compression strength of mortar increased as the content of polysilicon sludge increased. In day 3, 7, and 28, the tendency in which the compression strength increasing up to 5% of the amount of added polysilicon sludge was shown. It is because when clinker was produced, the chloric component increased the amount of $C_3S$ mineral created, thus enhancing the compression strength after day 3.

발전부산물을 활용한 아스팔트 포장용 채움재의 현장시공특성 평가 연구

박근배(Park, Keun Bae),우양이(Woo, Yang Yi),문보경(Moon, Bo Kyung) 한국콘크리트학회 2017 한국콘크리트학회 학술대회 논문집 Vol.29 No.1

산업부산물을 활용한 아스팔트 포장용 채움재 개발 및 현장시공 성능평가 연구

조도영(Do-Young Cho),박근배(Keun-Bae Park),우양이(Yang-Yi Woo),문보경(Bo-Kyung Moon) 한국건설순환자원학회 2016 한국건설순환자원학회 논문집 Vol.4 No.3

국내 화력발전소의 추가 증설과 관련하여 발생 부산물의 신규 사용처 연구가 필요한 실정이다. 본 연구에서는 화력발전소에서 발생되는 플라이애시와 열병합발전소에서 발생되는 열병합애시, 배연탈황공정에서 발생되는 탈황석고 등 부산물로부터 아스팔트 포장용 채움재의 KS 규격을 만족하는 채움재를 제조하였다. 제조된 혼합 채움재와 기존 석회석 채움재의 특성을 비교하고, 각각의 채움재를 사용하여 아스팔트 혼합물을 제조하는 실내실험을 통해 특성을 비교하였다. 또한 혼합 채움재와 석회석 채움재를 사용하여 아스팔트 포장 현장실험을 실시하였다. 현장실험에 사용된 아스팔트 혼합물에 대해서 실내실험과 동일하게 동적안정도, 마샬안정도, 인장강도비, 포화도, 간극률, 흐름값을 평가하였다. 실내실험 및 현장시공시험 결과 기존 석회석 채움재를 사용한 경우보다 동적안정도 및 마샬안정도, 인장강도비에서 우수한 특성을 나타내었으며, 배합설계의 최적화를 통해 기존 석회석 채움재의 특성을 만족시키는 채움재 개발 가능성을 확인하였다. In this study, asphalt paving filler, which satisfies the KS standards, were prepared from industrial by-products, such as fly ash generated from thermal power plants, cogeneration ash generated from cogeneration plants, and desulfurized gypsum generated from the flue-gas desulfurization process. The properties of the prepared mixed filler and the existing limestone filler were compared through laboratory tests for preparing asphalt mixture using each filler. In addition, asphalt pavement field tests were conducted using the limestone filler and mixed filler. The dynamic stability, Marshall stability, tensile strength ratio, saturation, porosity, and flow value of the asphalt mixtures used in the field test were evaluated, as was done in the laboratory test. The laboratory and field construction test results revealed outstanding tensile strength ratio, Marshall stability and dynamic stability when using the prepared filler than for the existing limestone filler. Through optimization of the mixing design, the possibility of developing fillers, which the characteristics of the existing limestone filler, was confirmed.

석탄회 기반 채움재를 활용한 아스팔트 콘크리트의 공학적 특성

김영욱(Young-Wook Kim),박근배(Keun-Bae Park),우양이(Yang-Yi Woo),문보경(Bo-Kyung Moon) 한국건설순환자원학회 2017 한국건설순환자원학회 논문집 Vol.5 No.3

본 연구에서는 국내 화력발전소에서 발생되고 있는 산업부산물을 활용하여 아스팔트 콘크리트용 채움재를 개발 및 혼합물에 적용하여 함량에 따른 특성 및 소성변형 저항성에 미치는 영향을 관찰하였다. 실험결과 석탄회 기반 채움재를 사용할 경우 최적아스팔트함량(OAC)는 기존 채움재 대비 0.1% 낮은 값을 나타내었다. 도출된 최적아스팔트함량에서 채움재 함량에 따른 간접인장강도 및 인장강도비 측정 결과 함량 증가에 따라 높은 성능을 발현하였고, 2.0% 이상의 함량에서 국내 단체표준 품질관리 기준 각 0.8 이상과 0.75 이상을 만족하는 결과를 얻을 수 있었다. 동적안정도는 채움재 2.5%의 함량에서 가장 높은 저항성을 나타내었으며, 함량이 2.5%를 넘어설 때 오히려 성능발현이 저하되는 결과를 나타내었다. 과도한 채움재의 혼입은 상대적으로 아스팔트 함량이 감소되기 때문에 취성파괴를 유발할 수 있으므로 최적의 채움재/아스팔트 의 비율을 찾아 적용하는 방안이 필요할 것으로 판단된다. This paper presents a laboratory investigation into the effects of fillers using industrial by-product such as coal ash, IGCC slag on properties of hot-mixed asphalt concrete variation with filler content. For comparison, existing mixture with lime and dust have also been considered. Marshall and flow test has been considered for the purpose of mix design as well as evaluation of mixture. Other performance tests such as indirect tensile strength test, tensile strength ratio(moisture susceptibility), dynamic stability have also been carried out variation with filler content. It is observed that the mixes with industrial by-product exhibit conform with quality standard. Therefore, it has been recommended to utilize industrial by-product based on fly ash wherever available, not only reducing the produce cost but also partly solve the industrial by-product utilization and disposal problem.

밀레니얼 세대 여성 소비자의 화장품 소비에 미치는 소비 가치의 영향: 한국과 중국의 비교를 중심으로

우양 ( Yu Yang ),정속양 ( Su Yang Cheng ),전종우 ( Jong Woo Jun ) 한국외국어대학교 국제지역연구센터 2022 문화와 세계 Vol.3 No.2

This study explored the impact of consumption values on consumption behaviors of millennial female consumers. As a result of collecting samples from 18-34-year-old women in both Korea and China through a survey, the acceptance price of cosmetics was the most in the 70,000-90,000 won range. As a result of hypothesis testing, functional value, situational value, epistemological value and social value according to nationality showed differences. While Chinese consumers have higher functional and epistemological values of cosmetics than Korean consumers, Korean millennial consumers have higher social and situational values than Chinese consumers. Next, the effects of consumption value on purchase persistence, price sensitivity, brand pursuit, and mood change were different for Korean and Chinese millennial consumers. These results provide practical as well as academic implications on the difference in consumption value and the impact on cosmetics consumption for millennial consumers in Korea and China.