Toughness and characterization of reactive powder concrete with ultra-high strength

Ju, Yang; Liu, Hongbin; Chen, Jian; Jia, YuDan; Peng, Peihuo

doi:10.1007/s11431-009-0084-6

Cited by 22 publications

(11 citation statements)

References 10 publications

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“…The linear expansion coefficient  f is 10×10 6 /°C  f 12×10 6 /°C [3,109], which is less than that of the matrix of RPC  l 0 (see Table 2). Therefore, the apparent linear expansion coefficient  l  of the fiber-reinforced RPC decreases with increasing fiber content.…”

Section: Physical Mechanism Of Variation Of Thermal Expansion Coefficmentioning

confidence: 90%

“…(21) and (9), it is shown that theoretical equations are considerably similar to the empirical equations based on regression analysis of the experimental data. The elastic modulus and the elastic wave velocity c of fiber-reinforced RPC increase with increasing fiber volumetric fraction  v [3], which leads to the increase of the Debye temperature (see eq. (17)).…”

Section: Physical Mechanism Of Variation Of Specific Heat Capacitymentioning

confidence: 99%

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Investigation on thermophysical properties of reactive powder concrete

Liu

et al. 2011

Sci. China Technol. Sci.

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The thermophysical properties, such as thermal conductivity, thermal diffusivity, specific heat capacity and linear thermal expansion of reactive powder concrete (RPC) with different steel fiber volumetric fractions are investigated by means of high temperature tests. The thermophysical characteristics of RPC with different fiber volumes under different temperatures are analyzed and compared with those of the common high-strength concrete and high-performance concrete. The empirical relationships of thermophysical properties with temperature and fiber volume are identified. By the heat transfer and solid physics methods, the microscopic physical mechanism of heat transfer process and heat conduction properties of RPC are investigated, and the theoretical formulas of specific heat capacity and thermal expansion coefficient are derived, respectively. The effects of temperature and steel fibers on the specific heat capacity and the thermal expansion coefficient are quantitatively analyzed and the discriminant conditions are provided. It is shown that the experimental results are consistent with the theoretical prediction. reactive powder concrete (RPC), thermophysical properties, high temperature, fiber reinforcement, heat conduction, specific heat capacity, thermal expansion coefficient Citation: Ju Y, Liu H B, Liu J H, et al. Investigation on thermophysical properties of reactive powder concrete.

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Section: Physical Mechanism Of Variation Of Thermal Expansion Coefficmentioning

confidence: 90%

Section: Physical Mechanism Of Variation Of Specific Heat Capacitymentioning

confidence: 99%

Investigation on thermophysical properties of reactive powder concrete

Liu

et al. 2011

Sci. China Technol. Sci.

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“…It remarkably impairs the uniformity of stress-strain response of brittle and concrete-like materials and greatly lowers the precision and reliability of experiment results [37][38][39][40][41]. According to the observed static mechanical properties of RPC [3,7], a copper plate with diameter of 20 mm and thickness of 2.5 mm was mounted to the head of the incident bar as a wave shaper to extend the impulse rising time and reduce both the dispersion effect of incident wave and the inertial effect.…”

Section: Impact Tests and Measurementsmentioning

confidence: 99%

“…With specific fabrication procedures, RPC achieved a static compressive strength between 200 and 800 MPa, a flexural strength around 140 MPa and a rupture energy capacity as much as 40 kJ/m 2 . RPC can sustain 500°C high temperature for two hours with a residual strength of 50% of the peak compressive capacity [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. For these exclusive physical and mechanical performances, RPC has been widely promoted and applied in construction of highways, bridges, skyscrapers, oversized buildings, nuclear facilities, military engineering, etc.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of dynamic mechanical properties of reactive powder concrete under high-strain-rate impacts

Liu

Sheng

et al. 2010

Sci. China Technol. Sci.

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The dynamic mechanical properties of reactive powder concrete subjected to compressive impacts with high strain rates ranging from 10 to 1.1×10 2 s -1 were investigated by means of SHPB (split-Hopkinson-pressure-bar) tests of the cylindrical specimens with five different steel fiber volumetric fractions. The properties of wave stress transmission, failure, strength, and energy consumption of RPC with varied fiber volumes and impact strain rates were analyzed. The influences of impact strain rates and fiber volumes on those properties were characterized as well. The general forms of the dynamic stress-strain relationships of RPC were modeled based on the experimental data. The investigations indicate that for the plain RPC the stress response is greater than the strain response, showing strong brittle performance. The RPC with a certain volume of fibers sustains higher strain rate impact and exhibits better deformability as compared with the plain RPC. With a constant fiber fraction, the peak compressive strength, corresponding peak strain and the residual strain of the fiber-reinforced RPC rise by varying amounts when the impact strain rate increases, with the residual strain demonstrating the greatest increment. Elevating the fiber content makes trivial contribution to improving the residual deformability of RPC when the impact strain rate is constant. The tests also show that the fiber content affects the peak compressive strength and the peak deformability of RPC in a different manner. With a constant impact strain rate and the fiber fraction less than 1.75%, the peak compressive strength rises with an increasing fiber volume. The peak compressive strength tends to decrease as the fiber volume exceeds 1.75%. The corresponding peak strain, however, incessantly rises with the increasing fiber volume. The total energy E disp that RPC consumed during the period from the beginning of impacts to the time of residual strains elevates with the fiber volume increment as long as the fiber fraction is not larger than 2%. It turns to decrease if the fiber volume exceeds 2%. The added fibers make various contributions to enhancing the capability of RPC to consume energy at different loading stages. If the fiber fraction is not larger than 2%, the added fibers make more contribution to enhancing the energy consumption ability of RPC in the period before the peak strain than in the period after the peak strain. The impact strain rate, however, distinctively affects the total energy that RPC consumed and the energy consumed in the different loading periods. The higher the impact strain rate, the more the energy consumed in the stages and therefore the higher the dynamic impact toughness. The empirical relationships of the peak compressive strength, corresponding peak strain, residual strain, total consumed energy and the energy consumed in the varied periods with the impact strain rate and the fiber fraction are derived. Four generalized forms of the dynamic impact stress-strain responses of RPC are formulated by normalizing ...

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“…Since the advent of RPC, it has attracted great attention for both academic and engineering aspects and has been widely used in a variety of engineering applications, such as skyscrapers, pavements, bridges, runways, nuclear containments, underground tunnels, etc. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Toughness and characterization of reactive powder concrete with ultra-high strength

Cited by 22 publications

References 10 publications

Investigation on thermophysical properties of reactive powder concrete

Investigation on thermophysical properties of reactive powder concrete

Experimental study of dynamic mechanical properties of reactive powder concrete under high-strain-rate impacts

On the thermal spalling mechanism of reactive powder concrete exposed to high temperature: Numerical and experimental studies

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