Dynamic compressive behaviour of concrete after exposure to elevated temperatures

Ren, Weibo; Xu, Jinyu; Su, Haoyang

doi:10.1617/s11527-015-0722-3

Cited by 12 publications

(12 citation statements)

References 32 publications

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“…In the case of impact velocity 25.0 m/s, it seems to be a property transforming speed and the second stages of the curves are nearly horizontal with no obvious strengthening or softening effects. This is similar to the experimental results of dynamic compression tests of unsaturated polyester polymer concrete at different curing ages carried out by Chen et al [ 34 ]. They also found the dynamic compression stress-strain curves under different strain rates and curing ages experience strain hardening stages to strain softening ones.…”

Section: Resultssupporting

confidence: 91%

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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Section: Resultssupporting

confidence: 91%

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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“…Stress–strain behavior is one of the important characteristics for concrete-like materials, which can reflect their strength and deformation properties during loading processes [24]. In order to fully comprehend the dynamic response of concrete with different SF levels, Figure 7 shows the complete stress–strain behavior of concrete specimens under different SF levels and impact velocities.…”

Section: Resultsmentioning

confidence: 99%

“…The mechanical properties and dynamic behaviors of brittle materials relate to the strain rate [24]. Therefore, concrete is a typical strain rate-sensitive material.…”

Section: Resultsmentioning

confidence: 99%

“…Split Hopkinson pressure bar (SHPB) device is an effective technique to analyze and characterize the mechanical properties and dynamic behaviors of brittle materials at high strain rate. In recent years, researchers studied the dynamic mechanical properties of brittle materials, such as rock or rock-like materials [19,20,21,22,23], concrete-like materials [24,25,26,27,28], and ceramics materials [29,30], by using an SHPB device under strain rates ranging from 10 2 to 10 4 s −1 . Many factors have obvious influences on the strain rate sensitivity of concrete.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Silica Fume in Concrete on Mechanical Properties and Dynamic Behaviors under Impact Loading

Zhao

Zhang

2019

Materials

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The effect of silica fume (SF) in concrete on mechanical properties and dynamic behaviors was experimentally studied by split Hopkinson pressure bar (SHPB) device with pulse shaping technique. Three series of concrete with 0, 12%, and 16% SF as a cement replacement by weight were produced firstly. Then the experimental procedure for dynamic tests of concrete specimens with SF under a high loading rate was presented. Considering the mechanical performance and behaviors of the concrete mixtures, those tests were conducted under five different impact velocities. The experimental results clearly show concrete with different levels of SF is a strain-rate sensitive material. The tensile strength under impact loading of the tested specimens was generally improved with the increasing content of SF levels in concrete. Additionally, the tensile strength under impact loading of the concrete enhances with the increase of the strain rates. Finally, failure modes, dynamic tensile strength, dynamic increase factor (DIF), and critical strain are discussed and analyzed. These investigations are useful to improve the understanding of the effect of SF in concrete and guide the design of concrete structures.

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“…Many researchers have investigated the performance of the concrete after exposure to high temperatures, including the change in the microstructure [1][2][3], the degradation of mechanical performance of ordinary concrete [4][5][6][7] and high-strength concrete [8,9], and the effect of different cooling methods [10,11]. It is noted that the mechanical behavior of concrete (both ordinary concrete and highperformance concrete) after exposure to high temperatures degraded to different degrees and is affected by cooling methods.…”

Section: Introductionmentioning

confidence: 99%

Degradation Behavior of Concrete after Freeze-Thaw Cycles and Then Exposure to High Temperatures

Xie

Yang

et al. 2019

Advances in Materials Science and Engineering

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Concrete behavior usually degrades due to freeze-thaw cycles, fire, or both. Existing studies on the degradation behavior of concrete due to exposure to high temperatures were primarily focused on unfrozen concrete. In this paper, the degradation behavior of damaged concrete, after different freeze-thaw cycles (25, 35, 45, and 55 cycles), exposure temperatures (20°C, 300°C, 400°C, and 500°C), and cooling methods (water-cooled and air-cooled), was tested with seventy-five prism specimens. The degradation behavior of the damaged concrete, such as surface characteristics, weight loss, compressive strength, peak strains, and elastic modulus, was studied and analyzed. Results show that (i) the surface color of the concrete does not change significantly throughout the test. As the number of freeze-thaw cycles and temperatures increase, the weight loss of the concrete specimens increases gradually. (ii) After freeze-thaw cycles, the relative strengths and elastic modulus of the concrete specimens significantly degrade compared with those of the unfrozen ones at same temperatures. (c) At elevated number of freeze-thaw cycles and exposure temperatures, the peak strain of the concrete increases gradually. (d) Cooling methods have different effects on the degradation of concrete under different number of freeze-thaw cycles. Finally, a uniaxial compression constitutive model for concrete after freeze-thaw cycles and then exposure to high temperatures was established and a good agreement was observed with test results.

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Dynamic compressive behaviour of concrete after exposure to elevated temperatures

Cited by 12 publications

References 32 publications

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

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

Effect of Silica Fume in Concrete on Mechanical Properties and Dynamic Behaviors under Impact Loading

Degradation Behavior of Concrete after Freeze-Thaw Cycles and Then Exposure to High Temperatures

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