Use of Composites to Resist Blast

Malvar, L. J.; Crawford, John E.; Morrill, Kenneth B.

doi:10.1061/(asce)1090-0268(2007)11:6(601)

Cited by 81 publications

(30 citation statements)

References 13 publications

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“…It was concluded that that the columns of the Murrah building could have been upgraded using FRP composite wraps to enhance their blast resistance, limit their lateral deflection, and prevent its collapse. Malvar et al (2007) also showed that both steel jackets and FRP wraps could be used to successfully prevent column damage and building collapse. Elsanadedy et al's (2011) numerical study on CFRP-retrofitted concrete column using the K&C concrete damage model indicated that charge weight and stand-off distance in a blast event plays the critical role on the response of the concrete columns under explosion but even a light retrofitting could provide considerable increase of blast resistance of columns.…”

Section: Frp Retrofitted Concrete Columnsmentioning

confidence: 99%

“…The third part of this paper presents a review of the fatigue behaviour of concrete structures strengthened with externally bonded FRP, focusing on the fatigue performance of FRP-concrete bond interface. Buchan and Chen (2007) and Malvar et al (2007) summarized experimental and finite element (FE) studies conducted to investigate the behaviour of FRP strengthened concrete structures under blast loads available in the public literature before 2006. Thus, this section presents a review of the more recent studies on FRP strengthened concrete structure under blast and impact loads conducted since then.…”

Section: Introductionmentioning

confidence: 99%

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A review of FRP strengthened concrete structures under extreme loading

Chen¹,

Xie

Tao

et al. 2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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Many concrete structures are vulnerable to extreme loadings such as accidental impact, terrorist attack and earthquake disasters. Retrofitting of existing concrete structures for enhanced performance under these loadings has been an important topic of research for a long time, especially since the 911 terrorist attack. Among the different retrofitting techniques, external bonding of fibre reinforced polymer (FRP) composites has been a popular one. This paper presents a brief review of recent research on FRP strengthened concrete structures under blast, impact, earthquake and cyclic loading.

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Section: Frp Retrofitted Concrete Columnsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A review of FRP strengthened concrete structures under extreme loading

Chen¹,

Xie

Tao

et al. 2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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“…In recent years, different HPFRCCs have been developed to improve the mechanical performance, resilience and durability of concrete structures [15,16]. HPFRCCs have been expected to improve on the drawbacks of concrete and improve on impact resistance [17]. Most recently, river sand and high-volume supplementary cementitious materials such as fly ash and/or ground-granulated blast slag have been used to reduce material costs and carbon footprints [15,16].…”

Section: Introductionmentioning

confidence: 99%

Effect of SIFRCCs with Varying Steel Fiber Volume Fractions on Flexural Behavior

2020

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Conventional concrete is a brittle material with a very low tensile strength as a result of compressive strength and tensile strain. In this study, the flexural behavior characteristics of slurry-infiltrated fiber-reinforced cementitious composites (SIFRCCs) based on slurry-infiltrated fiber concrete (SIFCON), such as high-performance fiber-reinforced cementitious composites (HPFRCCs), were analyzed to maximize the fiber volume fraction and increase resistance to loads with very short working times (such as explosions or impacts). For extensive experimental variables, one fiber aspect ratio and three fiber volume fractions (6%, 5%, and 4%) were designed, and the flexural toughness and strength were figured out with respect to variables. A maximum flexural strength of 45 MPa was presented for a fiber volume fraction of 6%, and it was found that by increasing the fiber volume fraction the flexural strength and toughness increased. The test results with respect to fiber volume fraction revealed that after the initial crack, the load of SIFRCCs frequently increased because of the high fiber volume fraction. In addition to maximum strength, acceptable strength was found, which could have a positive effect on brittle fractures in structures where an accidental load is applied (such as an impact or explosion).

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“…The second important range of application of polyurea spray coatings is as blast protection of ceramic and composite structures, especially long fiber reinforced thermoset structures, such as glass fiber reinforced epoxy composites [6]. In case of the application of two-component sprayed polyurea coatings on exterior concrete or masonry objects subjected to impact load or blast, the polyurea's large scale elongation during short term load enables the dissipation of significant amounts of energy, as well as save continuous membrane holding the crushed structure [7].…”

mentioning

confidence: 99%

Milled basalt fibers as reinforcement for polyurea composite spray coatings with improved thermomechanical stability and mechanical performance

et al. 2020

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The novel polyurea-based (PUA) composites modified with milled basalt fibers (BMF), formed with spray coating technology were produced. The addition of 5-30 wt % of BMF into commercial two-component PUA was used as a low-cost modification which allowed to significantly improve the mechanical performance, as well as thermomechanical and thermal stability of the final products. It was found that the incorporation of 30 wt % of BMF resulted in over 30% stiffness improvement and extension using temperature of the coating above 80 °C. Moreover, an increase by 25 °C in thermal stability evaluated by thermogravimetric analysis (TGA) was achieved, without significant changes in the rheological behavior of the compositions, resulting in the presence of structural defects. Finally, an evaluation of crosslink density was conducted in order to ascertain that the applied modification of the thermoset reactive fast-curing system allows to obtain fully cured products which may be used as a spray coating for hydrotechnical objects protection. Mielone włókna bazaltowe jako wzmocnienie polimocznikowych kompozytowych powłok natryskowych o zwiększonej stabilności termomechanicznej i wytrzymałości mechanicznejStreszczenie: Metodą powlekania natryskowego wytworzono nowe kompozyty na bazie polimocznika (PUA) modyfikowanego mielonymi włóknami bazaltowymi (BMF). Komercyjny dwuskładnikowy PUA modyfikowano niskokosztowo za pomocą dodatku 5-30% mas. BMF, co pozwoliło na wyraźną poprawę właściwości mechanicznych, a także stabilności termomechanicznej i termicznej PUA. Stwierdzono, że wprowadzenie do polimocznika 30% mas. BMF zwiększyło o ponad 30% jego sztywność i umożliwiło rozszerzenie zakresu temperatury stosowania powłoki powyżej 80 °C. Metodą analizy termograwimetrycznej (TGA) stwierdzono wzrost stabilności termicznej o 25 °C, bez istotnych zmian w reologicznym zachowaniu kompozycji, mogących prowadzić do tworzenia się wad strukturalnych w gotowych wyrobach. Na podstawie oceny gęstości usieciowania potwierdzono, że przeprowadzona modyfikacja termoutwardzalnego reaktywnego systemu szybkiego utwardzania pozwala na uzyskanie w pełni utwardzonych produktów, które można zastosować jako powłokę natryskową do ochrony obiektów hydrotechnicznych.Słowa kluczowe: polimocznik, kompozyt, powłoka natryskowa, włókno bazaltowe, właściwości termomechaniczne.The growing knowledge of the influence of exploitation and weathering conditions on the durability over the whole life cycle of steel and concrete construction elements requires the development of novel protective methods. One of the most extensively developed protection methods used for large scale civil engineering objects, especially those made of concrete, is the application of polyurea (PUA) and polyurethane (PUR) elastomeric spray coatings [1,2]. Their benefi-

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Use of Composites to Resist Blast

Cited by 81 publications

References 13 publications

A review of FRP strengthened concrete structures under extreme loading

A review of FRP strengthened concrete structures under extreme loading

Effect of SIFRCCs with Varying Steel Fiber Volume Fractions on Flexural Behavior

Milled basalt fibers as reinforcement for polyurea composite spray coatings with improved thermomechanical stability and mechanical performance

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