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고강도 콘크리트용 시멘트계 메트릭스의 레올로지 성질 및 합리적 유동성 평가에 관한 연구
이건철,조병영,오동욱,Lee, Gun-Cheol,Cho, Byoung-Young,Oh, Dong-Uk 대한건축학회 2012 대한건축학회논문집 Vol.28 No.1
In this study, both rheological aspect for fluidity and correlation for fluidity evaluation methods of cement paste and mortar for high strength concrete mix are considered. Effects of the fiber and correlation of fluidity evaluation methods for cement paste and mortar of each mix in four high strength concrete mix of 40~100 MPa used on the site are reviewed. As a result, cementitious matrix appeared high fluidity, but fluidity in case of adding fiber into plain mix has been decreased because of high viscosity and networking effect of fiber. In addition, the relation of between each fluidity evaluation method and rheological parameters has rather lower interrelationship in case of slump flow, but it showed higher interrelationship with between both 500mm arrival time of L flow test and funneling time and rheology integer. Therefore, in case of high fluidity concrete such as high strength concrete, The physical evaluation including shear-strain rate in addition to fluidity evaluation such as flow is important.
외부환경 변화에 따른 단열소재 이용 시멘트 압출패널의 특성 검토
오동욱,이건철,조병영,Oh, Dong-Uk,Lee, Gun-Cheol,Cho, Byoung-Young 대한건축학회 2012 대한건축학회논문집 Vol.28 No.5
The purpose of this study was to analyze the weatherproof for insulation, warpage and unification characteristics of extrusion cement panel(ECP) according to the variation of external environment. Result to analyze mechanical properties of ECP in a preparatory experiment decided 50% about replacement ratio of insulation materials for fine aggregate as optimum mix of ECP. The weatherproof of ECP using 50% insulation materials were as follows; In insulation characteristics, the thermal conductivity after freezing and thawing test was higher than that after change of temperature and humidity. In warpage characteristics, bending strength and deflection were examined. V and PL with low density had low bending strength after freezing and thawing. The deflection of PL in bowing test was higher than another because hollow bead as insulation materials. Finally, unification characteristics of ECP followed from high quality as low length variations and good bond strength.
잔골재 대체재로서 바텀애쉬를 이용한 초속경 그라우트재의 수밀성 및 내구특성
이건철,오동욱,조병영,김영근,조정기,Lee, Gun-Cheol,Oh, Dong-Uk,Cho, Byoung-Young,Kim, Young-Geun,Cho, Chung-Ki 한국건설순환자원학회 2011 한국건설순환자원학회지 Vol.6 No.3
본 연구에서는 산업부산물로서 재활용율이 낮은 바텀애쉬와 혼화재를 이용하는 에코개념의 터널 보수용 초속경 그라우트 모르타르 개발을 목적으로 실시공 환경조건의 온도하에서 초속경 그라우트 모르타르의 수밀성 및 내구특성에 대하여 검토하였다. 수밀성으로 투수량 및 물흡수계수는 석탄회를 이용하는 시리즈 II의 경우가 증가하는 것으로 나타났으며, 온도조건별로는 $20^{\circ}C$ 양생조건이 $5^{\circ}C$ 양생조건 보다 투수량이 적은 것으로 나타났다. 또한, 본 연구범위 모든 시료는 KS F 4042(콘크리트 구조물 보수용 폴리머 시멘트 모르타르) 투수량 기준인 20g 이내를 만족하는 것으로 나타났다. 내구성으로 중성화 저항성은 고로슬래그 미분말로 치환 사용에 따른 단위시멘트량 감소로 약간 저하하는 것으로 나타났다. 또한, 내알칼리성 및 내산성 결과는 시리즈 I의 경우 수산화칼슘용액에 침지후의 압축강도가 침지전의 압축강도에 비해 저하하는 것으로 나타났다. 반면, 시리즈 II의 경우 강도저하가 미비한 것으로 나타났으며, $5^{\circ}C$ 양생조건의 경우 C 타입의 시멘트를 제외하고는 28일 재령의 압축강도와 동등한 값을 나타내어 고로슬래그 미분말 및 버텀애쉬를 치환 사용한 경우 내알칼리성 및 내산성이 큰 것 알 수 있었다. In this study, in order to develop ultra rapid hardening mortar(URHM) for tunnel repairs using bottom ash of low recycle ratio and Admixture as Eco concept, watertightness and durability properties of URHM on temperature condition of construction field were performed. Test result, seepage quantity and water absorption coefficient regarding watertightness of URHM were as in the following : series II > series I. Seepage quantity for the standard condition were smaller than low temperatures. all specimens were satisfied below 20g as standards of seepage quantity on KS F 4042. Because of the decrease of unit cement content by to replacement of blast furnace slag, the neutrlization resistance for durability properties was reduced. The result of alkali resistance and acide resistance, compressive strengths for specimens soaked in calcium hydroxide solution of seriesI were lower than compressive strengths for specimens not soaked. On the other hand, the case of series II show that the deterioration of compressive strengths for specimens was not almost showed. Compressive strengths of specimens soaked were similar with specimens not soaked except series II-C in $5^{\circ}C$. Therefore, specimens using both blast furnace slag and bottom ash were good in alkali resistance and acide resistance.