Tensile Properties of Hybrid Fiber-Reinforced Reactive Powder Concrete After Exposure to Elevated Temperatures
Source abstract
Abstract
The paper presents a research project on the tensile properties of RPC mixed with both steel and polypropylene fibers after exposure to 20–900 °C. The direct and the indirect tensile strength (in bending) were measured through tensile experiment on dog-bone specimens and bending experiment on 40 × 40 × 160 mm prisms. RPC microstructure was analyzed using scanning electron microscope. The results indicate that, steel fibers can significantly improve the tensile performance of hybrid fiber-reinforced RPC, whereas polypropylene fibers have no obvious effect on the tensile performance. With increasing temperature, the flexural and axial tensile strength of hybrid fiber-reinforced RPC substantially decrease linearly, which attributes to the deteriorating microstructure. Based on the experimental results, equations are established to express the decay of the flexural and tensile strength with increasing temperature.
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Research context
OpenAlex topics: Fire effects on concrete materials · Innovative concrete reinforcement materials · Concrete and Cement Materials Research
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References (29)
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