Effects of Polypropylene Fibre and Strain Rate on Dynamic Compressive Behaviour of Concrete

Chen, Meng; Ren, Chenhui; Liu, Yangbo; Yang, Yingjian; Wang, Erlei; Liang, Xiaoyao

doi:10.3390/ma12111797

Cited by 9 publications

(8 citation statements)

References 39 publications

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“…Since Kolsky developed the SHPB technology for the dynamic mechanical test [ 26 ], the SHPB tests have been extensively applied to study the mechanical properties of various materials under strain rates ranging from 10 2 to 10 5 s −1 , such as metals, rocks, composite materials and solid propellant [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ]. In this paper, an SHPB device was equipped to perform the impact loading experiment on the HTPB propellant.…”

Section: Experimental Methodologymentioning

confidence: 99%

Dynamic Mechanical Response and Damage Mechanism of HTPB Propellant under Impact Loading

et al. 2020

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The dynamic mechanical behaviors of Hydroxyl-terminated polybutadiene (HTPB) propellant was studied by a split Hopkinson pressure bar apparatus (SHPB) at strain rates ranging from 103 to 104 s−1. The obtained stress–strain curves indicated that the mechanical features, such as ultimate stress and strain energy, were strongly dependent on the strain rate. The real time deformation and fracture evolution of HTPB propellant were captured by a high-speed digital camera accompanied with an SHPB setup. Furthermore, microscopic observation for the post-test specimen was conducted to explore the different damage mechanisms under various conditions of impact loading. The dominated damage characteristics of HTPB propellant were changed from debonding and matrix tearing to multiple cracking modes of ammonium perchlorate (AP) particles, along with the increase of the strain rate. For the first time, the influence of AP particle density on the dynamic response of HTPB propellant was studied by analyzing the strain-rate sensitivity (SRS) index of HTPB propellant with two different filler content (80 wt.% and 85 wt.%), which deduced from a power function of ultimate stress and strain energy density. The result of this study is of significance for evaluating the structural integrity and security of HTPB propellant.

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Section: Experimental Methodologymentioning

confidence: 99%

Dynamic Mechanical Response and Damage Mechanism of HTPB Propellant under Impact Loading

et al. 2020

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“…Fibre reinforced concrete belongs to High Performance Concretes (HPC), which are typically used for strengthening linear horizontal members, for instance, beams [13,14]. The mechanical properties of fibre reinforced concretes are influenced by the type of used fibres, such as steel, glass, polypropylene of basalt [15][16][17]. The research [18] is focused on the mechanical properties and chloride resistance of chloride resistance of concrete reinforced with hybrid polypropylene and basalt fibres.…”

Section: Introductionmentioning

confidence: 99%

Strengthening of Concrete Column by Using the Wrapper Layer of Fibre Reinforced Concrete

et al. 2020

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Structures and bridges are being designed on the proposed and requested design lifetime of 50 to 100 years. In practice, one can see that the real lifetime of structures and bridges is shorter in many cases, in some special cases extremely shorter. The reasons for the lifetime shortening can be increased of the load cases (e.g., due to traffic on bridges, or due to other uses of a structure), using the material of lower quality, implementation of new standards and codes according to Eurocode replacing older ones. During the whole lifetime the structures must be maintained to fulfil the code requests. If the constructions are not able to fulfil the Ultimate Limit States (ULS) and the Serviceability Limit State (SLS), the structures or bridges have to be strengthened (whole or its elements). The purpose of the paper is the presentation of using a layer of the fibre concrete for a columns’ strengthening. Using the fibre reinforced concrete (FRC) of higher tensile strength makes it possible to increase the load-bearing capacity of the cross-section the column. The contact between the old concrete (core of column) and newly added layer (around column) is very important for using that method of strengthening. In the article, there is also a comparison of the surface modification methods.

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“…

where

is the static strength and

is the dynamic maximal compression stress. When analyzing the dynamic properties of concrete by an SHPB device, the increase rate of the dynamic strength is often evaluated by the relationship between DIF and the logarithm of strain rate [ 29 , 30 , 31 , 32 , 34 , 35 , 36 , 37 ].…”

Section: Resultsmentioning

confidence: 99%

“…The dynamic mechanical properties of concrete materials have attracted much attention, and the Split Hopkinson Pressure Bar (SHPB) has been used as a common testing device to evaluate materials' impact performance. The strain rate sensitivity is proven to be one of the significant properties of concrete [28][29][30][31][32][33]. In recent years, some researchers found that severe environmental factors would seriously deteriorate the dynamic performance of concrete [34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Dynamic Mechanical Properties of Epoxy Polymer Concrete under Ultraviolet Aging

Liao

Liu

et al. 2021

Materials

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Epoxy polymer concrete (EPC) is widely applied in engineering for its excellent mechanical properties. The impact loads and severe climatic conditions such as ultraviolet radiation, temperature change and rain erosion are in general for its engineering practice, potentially degrading the performance of EPC. In this paper, a procedure of accelerated aging for EPC, imitating the aging effect of ultraviolet radiation and hygrothermal conditions based on the meteorological statistics of Guangzhou city, was designed. After various periods of accelerated aging, the dynamic behaviors of EPC were studied by using a Split Hopkinson Pressure Bar (SHPB). The verification of the experimental data was performed. The two-stage dynamic compression stress-strain curves were obtained: (a) linear growth stage following by strain hardening stage at impact velocity 12.2 m/s and 18.8 m/s, (b) linear growth stage and then a horizontal stage when impact velocity is 25.0 m/s, (c) linear growth stage following by strain softening stage at impact velocity 29.2 m/s. The experimental results show that the specimens after longer accelerated aging tend to be more easily broken, especially at impact velocity 12.2 m/s and 18.8 m/s, while the strain rate is the main factor affecting the compression strength and stiffness. Ultimately the influence of strain rate and equivalent aging time on dynamic increase factor was revealed by a fitting surface.

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Effects of Polypropylene Fibre and Strain Rate on Dynamic Compressive Behaviour of Concrete

Cited by 9 publications

References 39 publications

Dynamic Mechanical Response and Damage Mechanism of HTPB Propellant under Impact Loading

Dynamic Mechanical Response and Damage Mechanism of HTPB Propellant under Impact Loading

Strengthening of Concrete Column by Using the Wrapper Layer of Fibre Reinforced Concrete

An Experimental Study on the Dynamic Mechanical Properties of Epoxy Polymer Concrete under Ultraviolet Aging

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