| Textile Reinforced Concrete（TRC）has been widely studied in the past 20 years.TRC has the advantages of high strength,high toughness and so on,which can significantly improve the mechanical properties of cement-based materials with low tensile strength.If the cement slurry is not fully immersed in the fiber bundle,the fiber bundle will be subjected to uneven force,and the outer fiber will be subjected to large force and destroyed first,thus preventing the full utilization of fiber strength.In order to improve the overall performance of TRC,it is usually necessary to treat the fiber.Therefore,in order to explore the influence of different fiber treatment methods on the mechanical properties and durability of TRC,a series of experimental studies have been completed and some conclusions have been obtained:Carbon textile and basalt textile were treated with epoxy resin,silane coupling agent and nano-silica.Through scanning electron microscope and macroscopic mechanical test,it was found that nano-silica impregnated with carbon textile reinforced concrete（CTRC）improved the performance better than that of basalt textile reinforced concrete（BTRC）.The enhancement effect of nano-Si O2impregnation on TRC performance depends on the amount of silica adhesion between the fiber filaments and the structure between the fiber filaments.The treatment of alkane coupling agent can increase the roughness of the fiber surface and enhance the amount of nano-Si O2adhesion on the fiber surface.The influence of different surface treatment methods and temperature on the interfacial properties of CTRC and BTRC was studied by single bundle pull-out test.The test results showed that the pull-out failure mode of carbon fiber bundles and cement-based interface could be changed by surface treatment of CTRC.The failure mode of basalts treated with epoxy resin,silane coupling agent and nano-Si O2can be changed from fiber bundle pull-out to partial or whole fiber fracture and gumming-treated,which shows the same change rule.The high temperature will decrease the bond property of the interface between the fiber bundles and cement base,and the bond force of the interface between the epoxy resin modified fiber bundles and cement base decreases most significantly.The interfacial strength of the nano Si O2impregnated carbon fiber bundles at 100 and 200 conditions is significantly higher than that of the epoxy impregnated carbon fiber bundlesThe effects of different surface treatments and temperatures on the mechanical properties of CTRC and BTRC were further investigated through three point bending tests.The results show that under room temperature or high temperature environment,epoxy resin immersion,direct immersion of nano silica and silane coupling agent and nano silicon dioxide composite processing can improve the flexural performance of carbon textile reinforced concrete plate,but for basalt textile reinforced concrete,only epoxy resin immersion can obviously improve the flexural strength and deformation capacity of the composite material.The specimens of carbon textile reinforced concrete treated with nano-silica and silane coupling agent showed excellent thermal stability.Through accelerated corrosion test,the influence of fiber treatment on seawater corrosion resistance of carbon and basalt textile reinforced concrete was analyzed.The experimental results showed that:the performance of basalt textile reinforced concrete deteriorates more significantly after accelerated corrosion than that of carbon fiber fabric reinforced concrete.Textile treatment under sea water corrosion conditions still can have more significantly enhanced toughening effect,epoxy resin coating the protective effect of the fiber is gradually reduce with the increase of corrosion of age,and two kinds of nano silica impregnated fiber protection is significant Relative to the bending strength,aging corrosion reducing of ultimate bending strain is even more obvious. |
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