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Koichiro Yamato,Akira Sasaki,Takayasu Ito,Isamu Yoshitake 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.2
In regions where the concrete structures are exposed to a salty environment, the concrete requires high resistance to chloride-ion penetration. To achieve higher resistance against chloride ingress, a pozzolanic admixture incorporating a high volume of SiO₂ and Al₂O₃ has been developed. The admixture is a fine mineral powder with a specific surface area of 13,000 m²/kg or higher. It is typically mixed with the concrete at a cement replacement level of 5-13 mass% (20-40 kg/m³). To demonstrate the applicability of the admixture to general ready-mix concretes, this study examined the fundamental properties of concrete cured under standard conditions regarding resistance against chloride ingress. Chloride immersion tests revealed high resistance against penetration of concrete produced with the admixture. Pore-size distribution analysis confirmed that the volume of pores less than 0.01 μm diameter increased whereas a decrease of large pores occurred (0.1 μm diameter or larger). The major contributor to the high resistance was found to be the immobilization of penetrating chloride ions by the formation of Friedel’s salt.
Optimization of energy saving device combined with a propeller using real-coded genetic algorithm
Ryu, Tomohiro,Kanemaru, Takashi,Kataoka, Shiro,Arihama, Kiyoshi,Yoshitake, Akira,Arakawa, Daijiro,Ando, Jun The Society of Naval Architects of Korea 2014 International Journal of Naval Architecture and Oc Vol.6 No.2
This paper presents a numerical optimization method to improve the performance of the propeller with Turbo-Ring using real-coded genetic algorithm. In the presented method, Unimodal Normal Distribution Crossover (UNDX) and Minimal Generation Gap (MGG) model are used as crossover operator and generation-alternation model, respectively. Propeller characteristics are evaluated by a simple surface panel method "SQCM" in the optimization process. Blade sections of the original Turbo-Ring and propeller are replaced by the NACA66 a = 0.8 section. However, original chord, skew, rake and maximum blade thickness distributions in the radial direction are unchanged. Pitch and maximum camber distributions in the radial direction are selected as the design variables. Optimization is conducted to maximize the efficiency of the propeller with Turbo-Ring. The experimental result shows that the efficiency of the optimized propeller with Turbo-Ring is higher than that of the original propeller with Turbo-Ring.
Optimization of energy saving device combined with a propeller using real-coded genetic algorithm
Tomohiro Ryu,Takashi Kanemaru,Shiro Kataoka,Kiyoshi Arihama,Akira Yoshitake,Daijiro Arakawa,Jun Ando 대한조선학회 2014 International Journal of Naval Architecture and Oc Vol.6 No.2
This paper presents a numerical optimization method to improve the performance of the propeller with Turbo-Ring using real-coded genetic algorithm. In the presented method, Unimodal Normal Distribution Crossover (UNDX) and Minimal Generation Gap (MGG) model are used as crossover operator and generation-alternation model, respectively. Propeller characteristics are evaluated by a simple surface panel method “SQCM” in the optimization process. Blade sections of the original Turbo-Ring and propeller are replaced by the NACA66 a = 0.8 section. However, original chord, skew, rake and maximum blade thickness distributions in the radial direction are unchanged. Pitch and maximum camber distributions in the radial direction are selected as the design variables. Optimization is conducted to maximize the efficiency of the propeller with Turbo-Ring. The experimental result shows that the efficiency of the opti-mized propeller with Turbo-Ring is higher than that of the original propeller with Turbo-Ring.