氧化石墨烯改性碳纤维水泥基复合材料抗冻性能研究

Freezing Resistance of Carbon Fiber Cement-Based Composites Modified by Graphene Oxide

【目的】纳米材料近些年被广泛应用在建筑行业。碳纤维(CF)水泥基复合材料是建筑行业中的一种新型智能建筑材料,其应用广泛,但CF应用在水泥基体中存在很多不足,如分散性差、界面黏结程度差等。利用纳米材料氧化石墨烯(GO)来改善碳纤维(CF)表面性能,可以提升CF在水泥基体中的抗冻性。【方法】采用电泳沉积的方法,利用GO对CF进行表面改性,制备GO-CF杂化纤维,分别对GO、CF及GO-CF水泥基复合材料的抗冻性能进行研究。【结果】在冻融循环次数为200次的条件下,掺量为1%的GO-CF水泥砂浆试件的强度损失率仅为32.7%。【结论】试验结果表明,在不同次数的冻融循环作用下,试件的抗压强度均有所降低,但GO-CF水泥砂浆试件的强度损失率明显低于CF水泥砂浆试件的强度损失率。

[Purposes]Nanomaterials have been widely used in the construction industry in recent years.Carbon fiber(CF)cement-based composite is a new intelligent building material in the construction industry,which is widely used.However,there are many shortcomings in the application of CF in the cement matrix,such as poor dispersion and poor interfacial bonding degree.Therefore,the nanomaterial graphene oxide(GO)is used to improve the surface properties of carbon fiber(CF).Thus,the frost resistance of CF in cement matrix can be improved.[Methods]GO-CF hybrid fibers were prepared by electrophoretic deposition by surface modification of GO.The antifreeze properties of GO,CF and GO-CF cement-based composites were studied respectively.[Findings]Under the condition of 200 freeze-thaw cycles,the strength loss rate of the specimens with 1% GO-CF cement mortar is only 32.7%.[Conclusions]The test results show that the compressive strength of the specimens decreases under different times of freeze-thaw cycles,but the strength loss rate of the GO-CF cement mortar specimens is significantly lower than that of the CF cement mortar specimens.