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通过纳米SiO2/纤维增强混凝土高温后抗压、劈拉和抗折试验,探讨了钢纤维和纳米SiO2对混凝土在不同高温后强度及变形性能的影响.结果表明:随温度升高,抗压、劈拉和抗折强度均减小;复合掺加纤维和纳米材料抗压强度及变形性能优于单掺纤维或纳米材料,随钢纤维掺量增大抗压、劈拉和抗折强度呈增大趋势,掺入纳米SiO2各强度指标均有改善,劈拉和抗折破坏形态得到改善,由脆性破坏转变为塑性破坏,变形曲线丰满度提高,下降段平缓.
The effects of steel fiber and nano-SiO2 on the strength and deformation properties of concrete after different high temperature were discussed through compressive, splitting and bending tests of nano-SiO2 / fiber reinforced concrete after high temperature.The results show that with the increase of temperature, The splitting tensile strength and the flexural strength all decrease. The compressive strength and deformation properties of composite fibers and nanomaterials are better than those of single fibers or nanomaterials. With the increase of steel fiber content, compressive strength, splitting tensile strength and flexural strength increase In the general trend, the strength indexes of nano-SiO2 were improved, the splitting and bending failure modes were improved, and the brittle failure changed into plastic failure. The fullness of deformation curve increased and the descending stage was gentle.