• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
• /
• pp.271-274
• /
• 2001

Recently, we are facing with the trend of demanding high durability concrete for creek structures. When creek structures are deteriorated, it is very difficult to repair them. The objective of this paper is to develop a mixing model for high durability creek concrete having 300kg/$\textrm{cm}^2$ compressive strength. According to the result of durability experiment, high durability concrete for creek structures has high resistance of air permeability, absorption, chloride diffusion, and chemical attack.

• 한국구조물진단유지관리공학회 논문집
• /
• 제6권1호
• /
• pp.205-212
• /
• 2002

The deterioration rate of concrete structures in urban area is accelerated due to rapid urbanization and environmental pollution. Repair materials and methods newly introduced in Korea should be investigated whether they are appropriate for the urban environment in Korea. The creek concrete structures are exposed in severe environmental condition than others. Based on these background in mind, the study is focused on evaluation of performance on repair materials used to rehabilitate creek concrete structures. To evaluate the performance of repair materials, four kinds of repair materials were selected based on polymer emulsion. This experimental study was conducted on fundamental performance such as setting time, compressive strength, bending strength, bonding strength, thermal expansion coefficient, and durability performance such as chloride diffusion, carbonation, chemical attack, and steel corrosion rate. On the basis of this study, the optimal repair material which is proper to the environment condition can be selected and service life of creek concrete structures can be extended. As a result, the life cycle cost can be reduced and the waste of material resources will be cut down.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 1999년도 봄 학술발표회 논문집(I)
• /
• pp.789-792
• /
• 1999

Reinforced concrete structures covered creek for road vehicle located in urban areas have been experiencing corrosion of concrete and reinforcing steel caused by $H_2S$ gases generated by anaerobic bacterial. H2S gases react with oxygen and water to form sulfuric acid ($H_2SO_4$). This acid chemically attacks concrete, and sulfate ions penetrate into the concrete, causing rebar corrosion. In this work, to determine the conditions of RC culvert boxes which were constructed in the 1970s, various tests were conducted, including carbonation depth, compressive strength, half-cell potential measurements, and XRD analyses. Results indicated that the concrete deterioration was caused by sulfate attack and rebar corrosion. This paper discusses the evaluation on the durability of reinforced concrete structures covered creek for road vehicle.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2008년도 춘계 학술발표회 제20권1호
• /
• pp.1117-1120
• /
• 2008

초고성능 콘크리트(Ultra High Performance Concrete)는 압축강도 200MPa, 인장강도 15MPa 및 휨강도 35MPa 정도의 높은강도 특성과 열화인자의 침투 및 확산 속도가 보통콘크리트에 비해 1/20에서 최대 1/10,000까지 낮은 고내구성을 나타내면서 동시에 슬럼프 플로우가 약 220mm 정도의 자기충전성 특성을 갖는 콘크리트이다. 최근 유럽을 중심으로 초고성능 콘크리트에 대한 연구가 활발히 진행되고 있으며 교량, 플랫폼 지붕구조 및 초고층 건축물 등에 적용이 점차 확대되고 있으며 일본에서는 이미 철도 교량의 거더로 활용도 목전에 두고 있다. 우리나라에서는 KICT를 중심으로 초고성능 콘크리트에 대한 연구가 2003년 이후 지속적으로 이루어지고 있으나 유럽 또는 일본에 비해 연구인력과 연구비의 투자 규모가 매우 작다. 여기에서는 그동안 KICT를 중심으로 한 국내 초고성능 콘크리트의 개발 및 활용 현황에 대하여 살펴보고 향후 이 분야에 대한 연구 활성화를 모색하고자 한다.