폴리프로필렌섬유를 혼입한 구조용 경량골재콘크리트의 내화특성

송훈 청운대학교 건설환경연구소 2014 청운대학교 건설환경연구소 논문집 Vol.9 No.2

The fire resistance of structural light-weight aggregate concrete are determined by properties ofhigh water content ratio and explosive spalling. Especially, structural light-weight aggregateconcrete is occurred serious fire performance deterioration by explosive spalling stem from thermalstress and water vapor pressure. Meanwhile, polypropylene fiber is very effective fire resistancematerial for explosive spalling. Thus, this study is concerned with explosive spalling of structural light-weight concrete usingpolypropylene fiber. From the experimental test result, structural light-weight aggregate concrete ishappened explosive spalling. But, polypropylene fiber mixing structural light-weight concrete isgood fire property for decrease of cross section and explosive spalling. 경량골재콘크리트는 콘크리트 구조물의 자중감소를 목적으로 사용되지만 경량골재는 다공체이므로화재와 같은 고온에 노출되는 경우 수증기압이나 열응력에 의해 골재 주변으로 응력이 집중될 가능성이 높아 폭렬이 발생하기 쉽다. 본 연구에서는 구조용 경량골재를 사용한 경량골재콘크리트의 내화특성과 폭렬방지에 유효하다고 알려진 PP섬유를 혼입하여 내화성능을 개선코자 한다. 실험결과 경량골재콘크리트는 실험초기부터 폭렬이 발생하여 단면손상에 의해 주근이 화염에 노출되어 내부온도가 급격히 상승하였다. 하지만 PP섬유를 혼입한 경우 단면손상이 표층부에 한정되어 혼입하지 않은 경우비해 내화성능이 개선된 것을 확인할 수 있다.

Self-cleaning 침투성 함침제의 적용에 따른 타일 및 콘크리트 표층부의 개질특성

송훈,전찬수,김영호 한국디지털건축·인테리어학회 2013 한국디지털건축인테리어학회 논문집 Vol.13 No.4

Concrete structure is not the only material vulnerable to physical and chemical processes of deterioration associates with severe conditions. Deterioration of the concrete structure, however, occurs more progressively from the outside of the concrete exposed to severe conditions. Especially, Carbonation, chloride ion attack is more important factor of concrete durability. This study is interested in manufacturing the self-cleaning concrete surface impregnant including TEOS, lithium silicate for the repair of the exposed concrete surface and the color concrete requiring the advanced function in view of the concrete appearance. Form the results, TEOS and lithium silicate are very effective that increasing the concrete durability using self-cleaning concrete impregnant. Self-cleaning concrete impregnant specimens is satisfied with performance requirement of KS standard in adhesion test in tension but the reinforcement of concrete substrate is slight. So, the self-cleaning concrete impregnant of this study is more desirable for the improvement of durability rather than the reinforcement.

혼화재 및 화학반응제를 혼입한 경량기포콘크리트의 물성 개선

송훈 한국디지털건축·인테리어학회 2012 한국디지털건축인테리어학회 논문집 Vol.12 No.4

Autoclaved lightweight concrete (ALC), also known as autoclaved aerated concrete (AAC), is a lightweight, precast building material that simultaneously provides structure, insulation. ALC is a unique building material. Because of its cellular nature, it is lightweight, self-insulating, as well as sound and fireproof. ALC products include blocks, wall panels, floor and roof panels, and lintels. Recently, the use of ALC has became increasingly popular. However, ALC have high water absorption, low compressive strength and popout the origin of the low surface strength in its properties. Thus, this study is to improve the fundamental strength by controls of increasing of admixtures and chemical reactants. Admixtures make use of meta kaolin and silica fume, chemical reactants make use of sodium silicate and sodium hydroxide. From the test result, the ALC using admixtures and chemical reactants have a good fundamental properties compared with plain ALC. These good fundamental properties is caused by the admixtures and chemical reactants of ALC by the reason of the micro filling effect and chemical binding of C-S-H gel, tobermolite and quartz.

고온에서의 알칼리 활성화 내화성 결합재의 강도 및 공극구조 평가

송훈,김영호,김완기,소형석 한국디지털건축·인테리어학회 2012 한국디지털건축인테리어학회 논문집 Vol.12 No.4

This study is interested in identifying the effectiveness of alkali-activated fire protection material compounds including the alkali-activator such as potassium hydroxide, sodium silicate and fly ash as the fire resistant finishing materials. Also, this paper is concerned with change in compressive strength and pore structure of the alkali-activated fire protection material at high temperatures. The testing methods of fire protection materials in high temperature properties are make use of TG-DSC and mercury intrusion porosimetry measurements. This study results show that compressive strength is rapidly degraded depending on a rise of heating temperature. Porosity showed a tendency to increase irrespective of specimen types. This is due to both the outbreak of collapse of gel comprising the cement and a micro crack by heating. However, alkali-activated fire protection material composed of potassium hydroxide, sodium silicate and fly ash has the thermal stability of the slight decrease of compressive strength and porosity at high temperature. These thermal stability is caused by the ceramic binding capacity induced by alkali activation reaction by the reason of the thermal analysis result not showing the decomposition of calcium hydrate.

규석 분말 및 석고 혼입에 따른 경량기포콘크리트의 강도특성 개선

송훈,추용식,이종규,Song, Hun,Chu, Yong-Sik,Lee, Jong-Kyu 한국건설순환자원학회 2012 한국건설순환자원학회지 Vol.7 No.4

ALC는 경량이며 단열 및 차열 등의 성능이 우수한 반면 낮은 강도로 인한 모서리부의 취성파괴가 발생하기 쉬우므로 운반 및 취급 시 상당한 주의를 요구한다. 본 연구에서는 ALC의 물리적 성능개선을 위해 메타카올린 및 실리카퓸 등의 혼화재나 규석 분말 및 석고의 혼입율을 조절하여 제조한 ALC의 성능을 평가하였다. 연구결과 메타카올린이나 규석 분말의 혼입율이 18%인 경우 강도의 개선이 현저하였다. 이와 같은 결과는 공극의 충전효과에 의한 것으로 강도는 개선되나 밀도가 증가하므로 밀도를 낮추면서 강도를 개선할 수 있는 배합이나 제조법에 대한 연구가 필요하다. Autoclaved lightweight concrete, also known as autoclaved aerated concrete(AAC) or autoclaved cellular concrete (ACC), is made with fine silica powder, quik lime, cement, and an Al powder. ALC contains 70~80% air. The lightweight material offers excellent sound and thermal insulation, and like all cement-based materials, is strong and fire resistant. However, ALC have high water absorption, low compressive strength and popout the origin of the low surface strength in its properties. These properties make troubles under construction such as cracking and popout. Thus, this study is to improve the fundamental strength by controls of increasing of admixtures, gypsum and silica powder size. Admixtures make use of metakaolin and silica fume. From the test result, the ALC using admixture have a good fundamental properties compared with plain ALC. Compressive strength, specific strength and abrasion's ratio were improved depending on increasing admixtures ratio's, gypsum and silica powder size.

구조용 경량골재를 사용한 경량골재콘크리트의 내화특성

송훈,조영국,추용식,이종규 청운대학교 건설환경연구소 2013 청운대학교 건설환경연구소 논문집 Vol.8 No.2

Light-weight aggregate concrete is usually looked upon as a two-component material, consisting of hydrated cement paste and structural light-weight aggregates. The fire resistance properties of light-weight concrete are determined by properties of its components and explosive spalling. Especially, light-weight aggregate concrete is occurred serious fire performance deterioration by explosive spalling. Thus, this study is concerned with explosive spalling of light-weight concrete using structural light-weight aggregates. From the experimental test result, light-weight aggregate concrete is happened explosive spalling. The decrease of cross section caused by explosive spalling made sharp increasing gradient of inner temperature. 경량골재콘크리트는 구조용 경량골재를 사용하여 제조한 콘크리트로 구조물의 경량화를 목적으로 사용된다. 하지만 경량골재콘크리트의 경우 화재에 취약하며 특히 단면결손을 유발하는 폭렬이 발생하기 쉽기 때문에 적용에 대한 사전검토가 필요하다. 본 연구에서는 내화성능이 취약하다고 알려진 경량골재콘크리트의 함수상태에 따른 내화특성에 대해 알아보고자 한다. 실험결과 구조용 경량골재를 사용한 경량골재콘크리트는 실험초기부터 폭렬이 발생하였으며 단면손상에 의해 주근이 노출되는 결과를 보여 내화성능이 취약하였다.

재생원료(망간, 제강슬래그)를 활용한 기능성 세라믹 섬유 단열재 개발

송훈,임형미,박선민,고현석,김한봄,Song, Hun,Lim, Hyung-Mi,Park, Sun-Min,Ko, Hyun-Seok,Kim, Han-Bom 한국건설순환자원학회 2019 한국건설순환자원학회지 Vol.14 No.3

미생물과 화학적으로 변성된 생물흡착제를 이용한 납 흡착특성

송훈,박민정,명정은,정욱진,정병철 대한환경공학회 1998 대한환경공학회 학술발표논문집 Vol.1998 No.12

폴리머 코팅 폐타이어 분말을 혼입한 시멘트 모르터의 기초적 성질

송훈,조영국,소양섭,Song, Hun,Jo, Young-Kug,Soh, Yang-Seob 한국콘크리트학회 1996 콘크리트학회지 Vol.8 No.6

Recently, the disposal of used vehicle tires is a big social problem because the amount of used vehicle tires has been increased with development of' automobile industry. Many researches have been made on the recycling of used vehicle tires in the various fields of industry as well as construction industry. When the crumb rubber made of vehicle tires is mixed in cement concrete and mortar, it is indicated that the adhesive strength of interface between the crumb rubber and cement hydrates is very low. The purpose of this study is to improve the fundamental properties by increasing of the adhesion strength of styrene-butadiene rubber(SF3R) latex coated crumb rubber in ; cement mortar. SBR-modified mortar using crumb rubber is also tested as the same method. From the test results, the cement mortar using SBR latex coated crumb rubber have a good fundamental properties compared with that using uncoated crumb rubber. The mechanical properties of SBR-modified mortar using crumb rubber with polymer-cement ratios of 10% are also improved. 최근 많은 양의 폐타이어가 발생됨에 따라 사회적 문제로 대두되고 있는 실정이며, 이에 대한 재활용은 각 분야에서 활발하게 연구되고 있다. 건설 분야에서는 폐타이어를 냉각 분쇄하여 만든 분말을 시멘트 콘크리트에 혼입하여 사용하는 연구가 많이 수행되고 있다. 시멘트 콘크리트에 폐타이어 분말을 혼입하여 사용할 때는 폐타이어 분말과 시멘트경화체 사이에서 접착성의 문제로 기초적 성질이 저감된다. 본 연구에서는 시멘트 모르터 내부에서 폐타이어 분말의 접착력을 증진시키기 위하여 시멘트 혼화용 폴리머 중의 하나인 스티렌 부타디엔 고무(SBR)라텍스를 사용하여 기초적 성질을 개선하고자 하였다. 실험결과 SBR 코팅 폐타이어 분말을 혼입한 시멘트 모르터는 코팅하지 않은 폐타이어 분말을 사용한 경우보다 기초적 성질이 개선되는 것으로 나타났으며, 또한 폴리머 시멘트비 10%를 사용한 SBR 라텍스 혼입 폴리머 시멘트 모르터의 경우에도 기초적 성질이 개선되었다.

인간의 난관수종액이 생쥐의 배아 발달에 미치는 영향

송훈,권석민,안재형,황영수,정경남,고재환,김용봉 인제대학교 2000 仁濟醫學 Vol.21 No.2

Recently, several reports have demonstrated significantly lower pregnancy rates and higher risk of pregnancy loss with IVF-ET in the presence of a unilateral or bilateral hydrosalpinx. But there is still a lack of knowledge as to how the hydrosalpinx exerts its detrimental effects, moreover it is unclear whether hydrosalpinx fluid exerts a direct embryotoxic effect. This study was to investigate the effect of human hydrosalpinx fluid on the development of mouse embryos by comparison of mouse embryo blastulation and hatching rates in media containing increasing concentrations of hydrosalpinx fluid. Culture of mouse embryos at 0% (controls), 0.4%, 0.8% and 1.2% hydrosalpinx fluid concentrations demonstrated lower blastulation and hatching rates at each level compared with the controls. These data suggested that hydrosalpix fluid is highly toxic to mouse embryos.