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Kim, Jeong-Eun,Park, Wan-Shin,Jang, Young-Il,Kim, Sun-Woo,Kim, Sun-Woong,Nam, Yi-Hyun,Kim, Do-Gyeum,Rokugo, Keitetsu Korea Concrete Institute 2016 International Journal of Concrete Structures and M Vol.10 No.3
When the energy performance of concrete is substantially higher than that of normal type concrete, such concrete is regarded as energy efficient concrete (WBSCSD 2009). An experimental study was conducted to investigate mechanical properties of energy efficient concrete with binary, ternary and quaternary admixture at different curing ages. Slump test for workability and air content test were performed on fresh concretes. Compressive strength, splitting tensile strength were made on hardened concrete specimens. The mechanical properties of concrete were compared with predicted values by ACI 363R-84 Code, NZS 3101-95 Code, CSA A23.3-94 Code, CEB-FIP Model, EN 1991, EC 2-02, AIJ Code, JSCE Code, and KCI Code. The use of silica fume increased the compressive strengths, splitting tensile strengths, modulus of elasticities and Poisson's ratios. On the other hand, the compressive strength and splitting tensile strength decreased with increasing fly ash.
Kim, Jeong Eun,Park, Wan Shin,Eom, Nam Yong,Kim, Sun Woong,Kim, Do Gyeum,Cho, Myung Sug Trans Tech Publications, Ltd. 2013 Applied mechanics and materials Vol.372 No.-
<P>In this study, some experimental investigations on the development of mechanical properties with age of high performance concrete (HPC) incorporated with blast furnace slag with fly ash or silica fume have been reported. Four different blended HPC were prepared in 0.40 water-binder ratio. At every four mixtures, the compressive strength, splitting tensile strength and modulus of elasticity at 7 and 28 days have been observed for HPC developments. Consequently, only replacement of silica fume significantly increases the mechanical properties in terms of compressive strength, splitting tensile strength and modulus of elasticity.</P>
Jeong-Eun Kim,Wan-Shin Park,Young-Il Jang,Sun-Woo Kim,Sun-Woong Kim,Yi-Hyun Nam,Do-Gyeum Kim,Keitetsu Rokugo 한국콘크리트학회 2016 International Journal of Concrete Structures and M Vol.10 No.3
When the energy performance of concrete is substantially higher than that of normal type concrete, such concrete is regarded as energy efficient concrete (WBSCSD 2009). An experimental study was conducted to investigate mechanical properties of energy efficient concrete with binary, ternary and quaternary admixture at different curing ages. Slump test for workability and air content test were performed on fresh concretes. Compressive strength, splitting tensile strength were made on hardened concrete specimens. The mechanical properties of concrete were compared with predicted values by ACI 363R-84 Code, NZS 3101-95 Code, CSA A23.3-94 Code, CEB-FIP Model, EN 1991, EC 2-02, AIJ Code, JSCE Code, and KCI Code. The use of silica fume increased the compressive strengths, splitting tensile strengths, modulus of elasticities and Poisson’s ratios. On the other hand, the compressive strength and splitting tensile strength decreased with increasing fly ash.
Mechanical Properties of High Strength Concrete Using Mineral Admixtures
Park, Wan Shin,Kim, Jeong Eun,Eom, Nam Yong,Kim, Sun Woong,Kim, Do Gyeum,Cho, Myung Sug Trans Tech Publications, Ltd. 2013 Applied mechanics and materials Vol.372 No.-
<P>This paper reports an investigation in which the performance of fly ash, blast furnace slag and silica fume high strength concretes were studied under 7 and 28 curing days. Three high strength concrete mixtures were made in this investigation. Mixtures containing 25% fly ash, 25% fly ash and 25% blast furnace slag, and 5% silica fume as cement replacement, respectively. The water-binder ratio of all the high strength concrete mixtures was kept constant at 0.34. The replacement of silica fume in the high strength concrete mixtures indicated higher value of the compressive strength, splitting tensile and modulus of elasticity. In addition, blast furnace slag is effective for strength and modulus of elasticity improvement between 7 to 28 curing days.</P>
A Study on Breeding Ecology of Oystercatcher (Haematopus ostralegus) at Yubu Island
Sang-Duck Lee,Sun-Gyeum Kim,Sun-Ho No,Heui-Young Kang,Chung-Yeol Baek,Sam-Rae Cho 한국조류학회II 2014 한국조류학회지 Vol.21 No.2
A survey of the breeding ecology of Oystercatcher (Haematopus ostralegus) inhabiting in the Youbu Island was conducted from February to August 2006. The maximum number of Oystercatcher was 2,500 in February and the minimum 150 in July. The nests had outer diameter of 191.7±6.14 mm, inner diameter of 127.3±3.90 mm, depth of 34.2±16.2 mm, and had far from high tide of 617.2±302.0 cm. The laying of eggs starts at the early April with average incubation of 29 days. The total number of eggs laid was 168, and the clutch size was 2.47±0.89. The eggs had a major axis of 57.51±0.06 mm, minor axis of 39.15±0.34 mm, and the weight was 44.30±0.26 g. The hatching success rate among 168 eggs was 78.6% (132 eggs), and the fledgling success rate was 9.8% (13 eggs). During the period of study, there were disturbance factors on 105 occasions and it was accounted for 54.3% by other birds, 14.3% by fishermen, 10.5% by fish boat and 20.9% by other causes.