Experiment research on mechanical properties of manufactured sand concrete reinforced with hybrid fiber after high temperature
In order to study the mechanical properties of manufactured sand concrete reinforced with fiber after high temperature,the axial compression tests of 40 manufactured sand concrete reinforced with fiber specimens were designed and completed,took maximum temperature,manufactured sand replacement rate,fiber content and fiber types as variable parameters.The change of ignition loss and failure pattern of specimens were observed,the stress-stain curves were obtained.The effects of maximum temperature,manufactured sand replacement rate,fiber content and fiber types on the compressive strength and ductility of manufactured sand concrete reinforced with fiber specimens were analyzed.The results showed thatfor different maximum temperatures,the internal structure of the specimen was seriously damaged with the increase of temperature,and the compressive strength and ductility decrease significantly.For different manufactured sand displacement rate,specimens with 50%replacement rate have relatively optimal compressive strength and ductility.For different fiber content,specimens with 1.1%fiber content have relatively optimal compressive strength and ductility.For different fiber types,when the content of steel fiber was certain,the compressive strength of specimens can be improved by basalt fiber,and the ductility of specimens can be improved by polypropylene fiber.
high temperaturehybrid fibermanufactured sand concretecompressive strength
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