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임홍범,최성용,최판길,윤경구 江原大學校 産業技術硏究所 2004 産業技術硏究 Vol.24 No.A
Latex modification of concrete provides the material with higher flexural strength, as well as high bond strength and reduced water permeability. However, If the thermal expansion properties of overlay concrete (latex-modified concretes) are big different from that of substrate (ordinary portland cement concrete), these would cause a big interfacial stresses and result in premature failure. Therefore, the purposes of this study were to investigate thermal expansion characteristics of latex-modified concrete with cement types. The result of thermal expansion showed the coefficient of thermal expansion of concretes increased with latex inclusion. The coefficient of thermal expansion of RSLMC was a little smaller than that of LMC, which might be due to the finer cement grain, compacter internal, and stiffer properties of concrete. However, the coefficients of LMC and RSLMC were quite similar to that of ordinary cement concrete. Thus, this would not cause an interfacial stresses and will enable to ensure long-term performance of concrete bridge deck overlays.
교량의 예방적 유지관리를 위한 콘크리트 보호재료의 활용 방안
임홍범 ( Lim Hong Beom ),신재인 ( Shin Jae In ),서상길 ( Seo Sang Gil ),박창호 ( Park Chang Ho ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
The corrosion of steel bars influences directly the safety and serviceability of concrete structures, and may eventually reduce the service life of concrete structures. Preventive maintenance can be defined as the act of keeping a structure in its as-built condition and protecting it from inevitable deterioration due to environment, traffic vibration and deicing chemicals. The concrete surface coating system is one of many ways to act for preventive maintenance. This study implies demanded capacities, specific properties and various types of concrete surface coating systems. In addition, these systems are considered that there is applicable to bridge members.
교량의 예방적 유지관리를 위한 콘크리트 보호재료의 활용 방안
임홍범(Lim Hong Beom),신재인(Shin Jae In),서상길(Seo Sang Gil),박창호(Park Chang Ho) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
The corrosion of steel bars influences directly the safety and serviceability of concrete structures, and may eventually reduce the service life of concrete structures. Preventive maintenance can be defined as the act of keeping a structure In its as~built condition and protecting It from inevitable deterioration due to environment, traffic vibration and deicing chemicals The concrete surface coating system is one of many ways to act for preventive maintenance. This study Implies demanded capacities, specific properties and various types of concrete surface coating systems In addition, these systems are considered that there is applicable to bridge members
화상분석법을 이용한 하이브리드 콘크리트의 공극구조 특성 및 투수성 평가
장봉진,전범준,홍영호,배종오,임홍범 한국도로학회 2015 한국도로학회논문집 Vol.17 No.1
PURPOSES : In this study, an image analysis method is used to evaluate the pore structure characteristics and permeability of hybrid concrete. METHODS: The binder weight of hybrid concrete is set to 400 kg/m3, 370kg/m3, and 350 kg/m3, and for each value of binder weight, the pore structure and permeability of concrete mixture is evaluated. The permeability of hybrid concrete is evaluated using a rapid chloride penetration test(RCPT). RESULTS : The concrete pore structure characteristics of hybrid concrete reveals that as the binder weight is reduced, the entrained air is reduced and the entrapped air is increased. The permeability of the hybrid concrete for all values was measured to be below 1000 C, which indicates a "Very Low" level of permeability relative to the evaluation standard of KS F 2711. Additionally, as the binder weight is decreased, there is a significant increase in the permeability of chloride ions. CONCLUSIONS : In this study, the pore structure characteristics of hybrid concrete at different binder weights shows that as the binder weight is reduced, the entrained air is reduced and the entrapped air is increased. Consequently, chloride ion penetration resistance of the hybrid concrete is diminished. As a result, it is expected that this will reduce the concrete’s durability.
최성용,이주형,임홍범,윤경구 강원대학교 산업기술연구소 2003 産業技術硏究 Vol.23 No.A
The properties of mechanics and durability of LMC have been performed actively. However. little studies on analysis and properties of thermal expansion has been on the temperature variation. Especially. the low of bonding strength and tensile cracking are caused by difference of thermal expansion between LMC and the substrate concrete Therefore, this study focused on effect of thermal expansion behavior and properties of LMC according to temperature variation. To identify the property of thermal expansion of LMC. tests of modulus of thermal expansion were carried out at 28 days after casting specimen. subjected to temperature variation between 10℃ and 60℃ The results of this study showed the modulus of elastic of LMC was similar to that of ordinary portland concrete(OPC) It means that stresses caused by difference of modulus of elastic did not occur on interface between LMC and existing concrete The modulus of thermal expansion of LMC had a little smaller than that of OPC The modulus of thermal expansion of polymer modified concrete is generally larger than OPC. but the result of this test IS disagree with the fact. which may be due to the humidity evaporation difference and aggregate properties