Abstract
The effects of high-temperature thermal cycling (temperatures up to 500°C) and steel fiber contents on the mechanical and thermal properties of ultrahigh-performance concrete (UHPC) containing polypropylene (PP) fibers were investigated in this study. The different maximum temperatures for thermal cycling included 300, 400, and 500°C. The mechanical properties, including the compressive strength and tensile strength, and thermal properties, including the unit weight and thermal conductivity, of the UHPC specimens were measured. The experimental results indicated that the compressive strength, tensile strength, unit weight, and thermal conductivity decreased as the temperature increased to 500°C. Test results showed that for each maximum temperature, the reduction of the thermal conductivities from one to six thermal cycles was not significant. The thermal conductivity of the UHPC decreased as the unit weight of the UHPC decreased, and the thermal conductivity also decreased as the compressive strength of the UHPC decreased. Scanning electron microscopy (SEM) analysis showed that the microstructures of the UHPC specimens exposed to high temperatures contained voids due to the PP fiber melting. The porosity of the UHPC specimens increased as the maximum temperature of the thermal cycles increased, which decreased the unit weights and thermal conductivities of the UHPC specimens. Moreover, the porosity at a temperature of 500°C increased by 60.0, 74.5, and 123.4% for steel fiber contents of 1.0, 1.5, and 2.0%, respectively. It might be due to incompatible thermal expansion between the concrete matrix and steel fiber.
Highlights
Burning fossil fuels in power plants could have adverse effects on the environment and bring attention to increasing the use of new and renewable energy sources, such as solar, wind, and geothermal energy
The mechanical and thermal properties of ultrahigh-performance concrete (UHPC) specimens containing steel fiber contents of 1.0, 1.5, and 2.0% were exposed to high-temperature thermal cycles ranging from 300 to 500°C. e compressive strengths, tensile strengths, unit weights, and thermal conductivities were measured before and after the UHPC specimens were exposed to thermal cycling. e relationships between the thermal conductivity and unit weight and between the thermal conductivity and compressive strength of the UHPC were examined
UHPC specimens before and after the concrete specimens were exposed to six thermal cycles with different maximum temperatures
Summary
Burning fossil fuels in power plants could have adverse effects on the environment and bring attention to increasing the use of new and renewable energy sources, such as solar, wind, and geothermal energy. Yuan et al [12] investigated the compressive strength and thermal conductivity of high-temperature aluminate cementitious materials, including nano-MgO, for thermal energy storage. Erefore, to apply UHPC as a solid media for thermal energy storage, studies must be performed on the mechanical and thermal properties of UHPC specimens under high-temperature thermal cycles. The mechanical and thermal properties of UHPC specimens containing steel fiber contents of 1.0, 1.5, and 2.0% were exposed to high-temperature thermal cycles ranging from 300 to 500°C. e compressive strengths, tensile strengths, unit weights, and thermal conductivities were measured before and after the UHPC specimens were exposed to thermal cycling. A type of monofilament PP fiber with a specific weight of 0.91 and a melting point of 160°C was used, as shown in Figure 1(b). e PP fibers were straight fibers that each had a diameter of 21 μm and a length of 12 mm
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