폐도자기 분말도 변화에 따른 순환골재 사용 콘크리트의 물리적 특성에 관한 연구

류현기,박정민,정재호,김의창,윤승조,Ryu, Hyun-Gi,Park, Jeong-Min,Joung, Jae-Ho,Kim, Eui-Chang,Yoon, Seung-Joe 한국건설순환자원학회 2011 한국건설순환자원학회지 Vol.6 No.2

본 연구의 목적은 폐도자기 분말도 변화에 따른 순환골재 강도 증진에 관한 연구로 유동성은 폐도자기 분말 치환율이 증가할수록 유동성이 감소하는 경향으로 나타났으며, 공기량은 KS 한도범위를 만족하는 것으로 나타났다. 압축강도는 순환골재 및 폐도자기 분말 치환율이 증가할수록 증가경향이고, 내구성으로 건조수축에 의한 길이변화는 폐도자기 미분말이 커질수록 다소 완만한 건조수축율을 나타내었고, 또한 단열온도상승은 순환골재 대체율 및 폐도자기 미분말이 증가할수록 최고온도에서 약 $6{\sim}10^{\circ}C$정도 낮게 나타내어 수화열에 의한 균열저감 효과를 발휘하였다. 순환골재 사용량을 30%정도 권장 하고 있지만 점토인 폐도자기의 분말도를 조절하여 사용할 경우 순환골재의 다량 사용시에는 콘크리트의 제반성상에 문제가 없을 것으로 판단되었다. Objective of this study is to identify properties on strength increase of hardened concrete and fluidization of non-hardened concrete using waste ceramics generated by construction waste, which is a type of industrial waste, and by ceramics, which is a clay plastic, during its production process, and determine length change ratio caused by drying shrinkage during substitution of recycle aggregate and waste ceramics, and whether they can be used as concrete compounds. Slump of non-hardened concrete exhibited the best fluidization and formability at recycled aggregate's replacement ratio of 60% driven by higher substitution ratio of recycled aggregate and waste ceramics while air content met the KS requirement when substitution ratio of waste ceramics was $4,000cm^2/g$. Compressive strength of hardened concrete exceeded the requirements at early age and standard age and temperature dropped by roughly $6{\sim}10^{\circ}C$ less than the standard at maximum temperature in adiabatic temperature increase, which will hopefully result in stronger durability.

부순모래 置換率 變化에 따른 콘크리트의 力學的 特性分析

柳顯紀 忠州大學校 1998 한국교통대학교 논문집 Vol.33 No.2

This study aims to present the reference data in efficiency mixing design of concrete using the mixed fine aggregate of the river and crushed sand, through trial mixing. It also aims to analyse the mechanical properties and shrinkage in hardened state. By the test results, the formula of the unite water content is as follows. 1) Substitute Ratio of Crushed Sand 0% : w/c = 0.0909·F + 81.0242 2) Substitute Ratio of Crushed Sand 20% : w/c = -0.1104·F + 86.2807 3) Substitute Ratio of Crushed Sand 40% : w/c = -0.1170·F + 86.5635 And, in mechanical properties of concrete, the compressive strength of the concrete containing crushed sand compared with river sand is lower, tensile strength is higher, and bending strength is the same. Drying shrinkage is increased while the replacement ratio of crushed sand is increaded.

잔골재율 변화에 따른 콘크리트의 특성분석

柳顯紀 충주대 2004 産業科學論文集 Vol.12 No.-

The volume of aggregate in a concrete mixture occupies approximately 70~80 percent of a total volume. Especially, Fine aggregate is important to mix design because it has a lot of effects on a concrete quality. Accordingly, this research that consults list of references mix and sets a standard looking for a proper S/a made a study of a concrete dynamical quality change according to the fluctuation of S/a.

현장에서의 원가절감 방안에 대하여

류현기,Ryu, Hyeon-Gi 한국건설안전협회 2009 建設 安全技術 Vol.50 No.-

카본블랙을 혼화재료로 사용한 콘크리트의 특성 분석

류현기,권용주 한국건축시공학회 2010 한국건축시공학회지 Vol.10 No.2

The purpose of this study is to determine the possibilities of blending carbon black, which is known for its permeability as well as its strong heat and fire resistance, into concrete, in a manner that reinforces its strengths mentioned above. Experiments show that in non-solidified, fresh-mixed concrete, the addition of carbon black effectively reduced slump level and air content due to its absorptiveness and minute particle size. It also showed good results in terms of coagulation time, penetration resistance and bleeding level. In solid concrete, it showed better strength than plain concrete. Due to the pozzolanic reaction, its strength became more pronounced over time. At approximately 850 degrees Celsius, the heat and fire resistance level increased in parallel to the level of chemical substitution (by carbon black). Drying shrinkage level appeared to be optimal, and environmental assessment test results related to CO, CO2 and formaldehyde also scored better than plain concrete. In summary, with the appropriate use of AE water-reducing agents, carbon black can prove to be a strong candidate as an ingredient for industry-grade concrete. 본 연구에서는 흡착 및 내열, 내화성이 우수한 카본블랙을 이용하여, 콘크리트의 제반성능을 파악하여, 콘크리트용 혼화재료로써 활용가능성 여부를 판단하고자 함이 본 연구의 목적이다. 실험결과 굳지 않은 콘크리트에서는 흡수율 및 미립분의 카본블랙의 충전효과로 인하여 슬럼프증가 및 공기량 감소를 나타내었으며, 블리딩, 관입저항에 의한 응결시간은 양호한 결과로 나타났다. 또한 경화콘크리트의 강도 특성에는 Plain보다 높은 강도를 나타내었으며, 포졸란 반응에 의해 장기강도로 갈수록 강도 발현이 높게 나타났다. 또한 약 850℃내외의 가열 후의 압축강도에서 치환율이 증가할수록 내화, 내열성이 높게 나타났으며, 건조수축 역시 양호하게 나타났고, CO, CO2, 포름알데히드의 환경성 평가도 Plain보다 양호한 결과로 나타났다. 이상 결과를 종합하면, 고강도의 배합설계를 고려한 적절한 AE감수제를 사용할 경우 카본블랙이 콘크리트용 혼화재로써 사용이 가능할 것으로 판단된다.

산업부산물 및 폐기물을 이용한 콘크리트용 골재-콘크리트용 골재로서 광산폐석의 활용

류현기 한국콘크리트학회 1997 콘크리트학회지 Vol.9 No.3

제조업 육성이 한국경제 살리는 길 -골판지 분야 연구개발이 절실이 필요-

류현기 (사)한국포장협회 1995 包裝情報 Vol.25 No.-

유해물질의 흡착 및 방향성콘크리트의 활용 가능성 분석

류현기,김홍래 忠州大學校 2010 한국교통대학교 논문집 Vol.45 No.-

Along with the ongoing developments of skyscrapers and large-scale facilities such as administrative and business complexes, there has been growing demand for use of eco-friendly construction materials. One emerging issue is the indiscriminate use of synthetic materials that are almost indistinguishable from their organic counterparts and the harmful gases released from concrete such as formaldehyde, CO2, CO, ammonia, radon gas, hexagon chrome, dust, etc, causing indoor air pollution. The purpose of this study is to develop materials to be used in concrete solution that will effectively reduce the pollutants and change them into fragrances and thus, calculate the possibility of “environment-friendly concrete”. This is done through two types of activated carbon (from coconut and lignum), diffused as chemical substitutions (10% replacement ratio) along with the addition of air freshener (0.02%) of lavender flavor such as coffee, lemon, pine, etc. The test results showed some loss of liquidity in non-solidified concrete due to the strong absorptive characteristics of activated carbon. However, the air content, bleeding level, penetration-resistance and coagulation time were at optimal level, especially more so with the coconut-based active carbon rather than the ligneous. In the case of solid concrete, when active carbon with numerous particle gaps were used as substitute aggregate, it proved to be weaker than the plain concrete. But the good dry shrinkage rate, absorption of the pollutants (formaldehyde, CO2, CO), plus the pleasant fragrances, mean great potential. With further studies and experiments such as lowering W/B and proper use of another admixture to improve the strength, the possibility of industry-grade, eco-friendly concrete is just around the corner.

무기질계 혼화재의 혼입률 변화에 따른 시멘트 모르터의 수밀 특성 분석에 관한 연구

柳顯紀,梁富弘 충주대학교 산업대학원 1999 大學院論文輯 Vol.1 No.-

This study is intended to devolop the self waterproof agents for high performance concrete by analyzing the properties of fresh and hardened mortar with various addition rations of the inorganic admixture and zinc stearate. As the results of the test,the flow and air content increase with the addition of expansive. When the replacement rate of silica fume increases, the flow decreases for the increased wiscidity. And the flow and air content decrease with the addition of zinc stearate. At hardened state,the compressive strength, tensile strength and flexual strength decrease with the addition of expansive additives and zinc stearate. With the increase of silica fume's replacement, they show a little decrease at early age and then increase gradually. Also, absorption and permeability show a steep decrease when zinc stearate is added, and a slack decrease with the replacement of silica fume.

하수슬러지 소각재를 이용한 시멘트 모르타르의 특성분석

류현기,박정민,Ryu, Heon-Ki,Park, Jeong-Min 한국건설순환자원학회 2010 한국건설순환자원학회지 Vol.5 No.3

오늘날 각종폐기물 발생량이 증가되는데, 본 실험 연구에서는 미장 및 벽돌 제조용의 배합비를 적용하여 시멘트 모르타르의 하수슬러지 소각재의 폐기물을 이용하여 활용가능성에 대한 기초적 자료를 제시함이 본 연구의 목적이다. 실험에 따른 결과를 종합해 볼 때, 배합비 1:2의 하수슬러지 10%와 황토의 소량 첨가율과 배합비 1:7의 경우 압축강도가 다소 작지만 석분과 하수슬러지 10% ~ 20%를 첨가하면 하수슬러지를 재순환 할 수 있으며, 환경 친화적인 재료의 기초적 자료로 활용 가능할 것으로 판단된다. This is an experimental research in order to judge the applicability of sewage sludge incineration ash having applied the mixing proportion needed to manufacture bricks and to do plaster work with addition of hwangtoh and slaked lime as a part of the methods for utilizing the wastes produced from sewage sludge incineration ash. Based on the results from experiment and analysis, it is judged that, in case of mixing proportion of 1:2 for the purpose of plastering and masonry work, the cement mortar produced by using a 10% addition ratio of sewage sludge incineration ash with mixture of hwangtoh covering all range of addition ratio, and also the cement mortar produced by using a 20% of sewage sludge incineration ash together with 0% and 10% addition ratio of hwangtoh, was possible to be applied to the practical use. In case of mixing proportion of 1:7 for manufacture of bricks and blocks, if such brick and block products are produced with 10% and 20% addition ratio of sewage sludge incineration ash having added aggregate fines or stone dust that has been actually used in brick and block manufacturing, it is judged that these bricks and blocks could be practically used in the job sites, although strength development is a little bit lower.