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수산화칼슘의 반응과 확산에 주목한 장기 중성화 예측에 관한 해석적 연구
박동천 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.8
The neutralization of cementitious materials, the reaction of carbonation dioxide from the outside and cement hydration product, such as calcium hydroxide, , was studied by the numerical analysis method (FEM) in order to make consideration of the change of the pore structure and wide-ranging relative humidity during the neutralization reaction. The diffusivity coefficient of calcium hydroxide and the rate coefficient of reaction were estimated through the sensitivity analysis by comparing the experimental value and analytic value.
유기계 건축 재료의 열화 성능 평가방법의 문제점 및 경시 변화를 고려한 수명 예측의 중요성에 관한 해석적 연구
박동천,안재철 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.4
A few problems about life prediction method, property evaluation method, exposure test of repair materials and finishing materials which is relatively easily deteriorated under the severe natural environment were discussed. The chloride ion diffusion FEM analysis taking due account of the property degradation of repair materials was carried out to emphasize the need for deteriorative properties evaluation with age and using them as input data of life prediction analysis. One of the conclusions is that it is important to know the deterioration pattern in consideration of outer causes like a circumstance and inner causes like a material's problem on deciding the serviceable life and suitable repair time.
콘크리트 구조물의 화학적 침식 방지를 위한 핀홀 발생 억제용 신타입 유리섬유 크로스의 개발에 관한 연구
박동천,오상균 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.3
In these days, Various constructive methods of anticorrosive coating to protect the concrete constructions in the vitriolic environment such as drainages are considered. In the research, an applicative lining method of construction applied existing glass fiber cross which has the most positive achievement is compared with a method applied new glass fiber cross to verify the effect of newly invented glass fiber cross and how it controls occurring pinholes. The following conclusions were obtained from the present study.(1) When existing glass fiber cross which is thick and has loose fiber intervals is used to secure thickness of layer, the occurring possibility of pinholes is increased by mixed air during the construction and viscosity of paints. (2) Adhesive strength highly exceeds 1.5 MPa(3) Generally, observed pinholes and mass change are increased together. When exiting glass fiber cross is used, viscosity of paint is increased and controlling effect of occurring pinholes is also increased. However, controlling effect of evaporation is not observed. When new glass fiber cross is used, evaporation of the moisture is not occurred after 4 weeks. (4) If viscosity of paints is high, controlling effect of pinhole is also getting higher.
레디믹스트 콘크리트의 설계기준 압축강도별 염소이온 확산특성
박동천,김용로 한국건축시공학회 2018 한국건축시공학회지 Vol.18 No.6
The RC buildings which are constructed on the seaside are followed by KBC(2016) to achieve the minimization ofdurability damage. To control the corrosion of the reinforcing steel bar by salt attack, W/C should be under 0.4 andspecified concrete strength is higher than 35MPa in the concrete/building construction standard specification. Eventhough it has been proved that the concrete mixed with mineral admixture such as blast furnace slag and fly ash etc. have high strength and durability in previous researches, the beneficial informations are not applied to the codes. Ready-mixed concretes which usually include the admixtures in Busan were tested to certify the salt attack durability. In the same specified concrete strength, remarkable salt attack durability was evaluated in comparison to OPC. Foreconomical and reliable durability design, chloride ion diffusivity should be measured before applying to new buildingconstruction. 해안도시에 건설하는 건축물의 콘크리트 배합은 환경조건에 따라 설계기준 압축강도로 제한하고 있으나 혼화재혼입에 의해 염해 내구성이 급격히 향상되고 있음이 기존연구에서 명확히 되고 있으나 아직 규정에 반영되고 있지는못한 실정이다. 본 연구에서는 레미콘의 배합을 분석하고비교 시험체 제작을 통하여 염해 내구성에 대한 건축구조기준을 만족시키면서 경제성을 가지는 결과를 도출하고자 하였다. 시판되는 레미콘의 경우 설계기준 압축강도 이상의강도와 그에 따른 염소이온 차단성을 가지며 전 배합조건에대해서 OPC 35MPa를 능가하는 성능을 확인할 수 있었다. 내구성 및 경제성을 동시에 달성하기 위해서 납품 전 사전배합을 실시하여 염해 저항성을 포함한 기본물성을 검토할필요가 있다고 사료된다.
재유화형 분말 수지를 이용한 폴리머 시멘트 모르타르의 선팽창 계수에 관한 연구
박동천,안재철,오상균 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.4
The thermal expansion rate among the heat characteristics of polymer cement mortar (PCM) is indispensable input data to evaluate the stress generating at a repair part under outsider environmental temperature using the numerical analysis such as FEM. Re-emulsification type polymer which is in the increasing demand due to the outstanding constructability was used in this study. Using the heat characteristic and mechanical property of PCM, The effects and mechanism of materials composition factor to the thermal expansion rate were discussed on the base of the experimental results. The following conclusions were obtained from the present study.1) The volume of PCM expand or contract by the increasing temperature. The mechanism is quite complicate because the volume change of materials component and moisture diffusion between pores happen simultaneously. 2) The thermal expansion rate generally increase with the relative moisture content.
재유화형 분말 수지 함유 폴리머 시멘트 모르타르의 함수율과 길이 변화의 관계에 관한 연구
박동천 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.8
Information of relationship between the length change and the moisture content change of polymer modified cement mortars (PCM) is a vital prerequisite to make an analytical prediction system of a stress increment occurring at a patch repair region such as repair materials, substrate and interface. In this study, experimental parameters, polymer content fraction and drying start age which is correspond to curing period of a repair region in the field, were adopted to find out the mechanism of the length change by the moisture content change of PCM. The results were discussed associating with mechanical properties and pore structure.