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RISS 인기검색어
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- 저자 : 김기헌 ( Kim Ki-heoun ) (검색결과 2 건)
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신설 콘크리트 교면 덧씌우기를 위한 라텍스 개질 콘크리트의 강도발현 특성
윤경구,김기헌,이주형,홍창우,김동호,Yun, Kyong-Ku,Kim, Ki-Heoun,Lee, Joo-Hyung,Hong, Chang-Woo,Kim, Dong-Ho 한국도로학회 2001 한국도로포장공학회 논문집 Vol.3 No.3
기존의 교면포장공법의 근본적인 문제점으로 인해 새로운 교면포장 공법이 점차 부각되고 있는 실정이며, 새로운 교면포장 공법으로 연구되고 있는 것이 라텍스 개질 콘크리트를 이용하는 것이다. 따라서, 본 연구에서는 신설 콘크리트 교량 교면포장으로 덧씌우기된 LMC의 강도발현 특성과 덧씌우기 될 때의 기존콘크리트와의 부착특성을 파악하고자 하였다. 이런 연구를 위해 라텍스 혼입률에 따른 라텍스 개질 콘크리트의 압축강도와 휨강도, 그리고 기존콘크리트와의 부착강도를 측정하였다. 본 연구결과 라텍스 혼입량 증가로 폴리머 입자들의 볼베어링 작용, 연행된 공기 및 라텍스 안에 있는 계면활성제의 분산작용에 의하여 LMC의 작업성과 휨강도를 증가시킨다는 사실을 파악 할 수 있었고, LMC와 기존 콘크리트 슬래브와의 부착강도는 크게 증진함을 알 수 있었다. This study focused on the investigation of compressive and flexural strengths development, and bond strength of latex modified concrete in order to validate the feasibility of application into concrete bridge deck overlay. Pull-out bond test was used for evaluating the bond strength of latex modified concrete to substrate. The main experimental variables were latex-cement ratio, surface preparation and moisture levels. The compressive strength of latex modified concrete decreased slightly and the flexural strength increased as the latex content increased from 5% to 20%. This might be due to the flexibility latex filled in voids and interconnections of hydrated cement and aggregates by a film of latex particles, respectively. In general, increasing the amount of latex will produce concrete with increased tensile and flexural strength and lower modulus of elasticity. Significant improvements in bond strength between new and existing concrete were achieved through the modification of the new concrete bridge deck overlay by latex polymers. The effect of surface preparation on bond of latex modified concrete to conventional concrete were significant at the conditions by sand paper and wire brush. A better bond could be achieved by rough surface rather than smooth. The saturated condition of surface is the most appropriate moisture level among the considered followed by dry condition and wet condition.
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조효남 ( Cho Hyo-nam ),김기헌 ( Kim Ki-heoun ),임종권 ( Lim Jong-kwon ),최현호 ( Choi Hyun-ho ),정평기 ( Jung Pyung-ki ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.1
Latex Modified Concrete(LMC) has been widely used on highway bridges over the past 35years around the world since it is more resistant to the intrusion of chloride ions, has higher tensile, compressive, and flexural strength, and has greater freeze-thaw resistance. However, in Korea it has not been introduced to fields due to higher initial construction cost for its overlay than conventional pavement materials. Due to durable characteristics it should be noted that the LMC may be cost-effective than conventional pavement technique such as asphalt pavement technique considering life-cycle cost(LCC) concept. The objective of this study is intended to suggest a practical LCC analysis model for pavement projects and to demonstrate relative cost-effectiveness of LMC overlays comparing with conventional pavement techniques. It may be stated that the procedure proposed in this study can be utilized for optimal decision of cost-effective pavement design.
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