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RISS 인기검색어
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- 저자 : Aofei Guo (검색결과 2 건)
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Flexural Behavior of Layered PVA Fiber/Steel Fiber Reinforced Cementitious Composite Plates
Aofei Guo,Fen Zhou,Yunxing Du,Chuntao Li 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.3
Polyvinyl alcohol (PVA) fiber reinforced cementitious composites (PFRCC) and steel fiber reinforced cementitious composites (SFRCC) were combined to develop two-layer cementitious composites (PF/SFRCC) with extraordinary strength and strain capacity. The flexural behavior of the PF/SFRCC plates was studied through the flexural test. The effects of the thickness of PFRCC and the loading face on the load-deflection relationship, cracking load and deflection, and ultimate load and deflection of the PF/SFRCC plates were discussed. The results showed that as the thickness of PFRCC increases, the behavior of specimens transforms from deflection softening to deflection hardening if the SFRCC is the loading face; however, the specimens always exhibit the deflection softening behavior if the PFRCC is the loading face. Also, the cracking load and the cracking deflection do not change too much, and the ultimate load gradually decreases; however, the ultimate deflection increases significantly if the SFRCC is the loading face but changes slightly if the PFRCC is the loading face. When the SFRCC instead of PFRCC serves as the loading face, the specimens tend to exhibit the deflection hardening behavior; the cracking load, cracking deflection, and ultimate load do not change too much; however, the ultimate deflection is significantly higher.
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Dynamic Compressive Behavior of CTRC and ECC Layered Concrete under Impact Load
Aofei Guo,Fen Zhou,Yunxing Du,Rui Yan 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.11
In this study, carbon textile reinforced concrete (CTRC) and engineered cementitious composites (ECC), together with steel fibers, were combined to fabricate two-layer concrete, called CTRC-ECC concrete. The dynamic compressive behavior of CTRC-ECC concrete was studied through the quasi-static compressive test and the impact test using a split Hopkinson pressure bar (SHPB). The effects of the thickness of CTRC, steel fibers, and impact face on the dynamic compressive strength, dynamic increase factor (DIF), strain at peak, and impact toughness of CTRC-ECC concrete were discussed. The results showed that as the thickness of CTRC increased, the dynamic compressive strength followed an increasing trend generally; the DIF decreased; and the strain at peak and the impact toughness increased firstly and then decreased. The addition of steel fibers to CTRC could increase the dynamic compressive strength significantly when the thickness of CTRC is less than 10 mm, improve the impact toughness slightly, but reduce the DIF significantly. In terms of the strain at peak, it firstly increased and then reduced and lastly did not change too much by steel fibers. The effect of impact face on the dynamic compressive strength, DIF, and impact toughness was not significant; however, when the CTRC face was subjected to impact load, the strain at peak could be slightly higher.
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