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Composite Strips with Various Anchor Systems for Retrofitting Concrete Beams
Yoshitake, Isamu,Yumikura, Keiyu,Mimura, Yoichi,Kim, Yail-J. Korea Concrete Institute 2011 International Journal of Concrete Structures and M Vol.5 No.1
This paper presents the performance of anchor systems for reinforced concrete beams retrofitted with carbon fiber reinforced polymer (CFRP) strips. Nine simply-supported beams are tested with various anchor systems such as steel hooks, steel plates with anchor bolts, CFRP anchor plates, and near-surface mounted (NSM) CFRP strip. The effects of these anchors on the behavior of the retrofitted beams are discussed, including load-carrying capacity, failure modes, and ductility characteristics. Test results indicate that end-anchorage is an important parameter when a CFRP-retrofit design is conducted. Mechanical bolts and NSM CRFP anchors are recommended.
Composite Strips with Various Anchor Systems for Retrofitting Concrete Beams
Isamu Yoshitake,Yail J. Kim,Keiyu Yumikura,Yoichi Mimura 한국콘크리트학회 2011 International Journal of Concrete Structures and M Vol.5 No.1
This paper presents the performance of anchor systems for reinforced concrete beams retrofitted with carbon fiber reinforced polymer (CFRP) strips. Nine simply-supported beams are tested with various anchor systems such as steel hooks, steel plates with anchor bolts, CFRP anchor plates, and near-surface mounted (NSM) CFRP strip. The effects of these anchors on the behavior of the retrofitted beams are discussed, including load-carrying capacity, failure modes, and ductility characteristics. Test results indicate that end-anchorage is an important parameter when a CFRP-retrofit design is conducted. Mechanical bolts and NSM CRFP anchors are recommended.
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.