高分散石墨烯改性水泥基材料力学性能的研究

Study on the Mechanical Properties of Highly Dispersed Graphene Modified Cement Based Materials

通过改性Hummers法制备出高分散性的石墨烯,并以不同的比例掺入到水泥基复合材料中进行力学试验研究。结果表明,掺入一定量的石墨烯能够有效地提高水泥基复合材料的抗折、抗压强度,当石墨烯掺量为0.03wt%时,28d龄期抗折、抗压达到最大值,分别为9.6MPa和62.8MPa,比普通空白样提高了10.3%和18.9%。分析水泥石的SEM、FT-IR及XRD等微观结果发现,石墨烯在水泥水化过程中,通过调控水化晶体的生长形态和聚集状态,改善了硬化水泥石内部微观孔隙分布,使材料密实度增加,从而提高其强度。

The highly dispersed graphene is prepared by modified Hummers method,and it is doped into cement-based composites with different proportions for mechanical experiments.The results show that the flexural and compressive strength of cement-based composites can be effectively improved by adding a certain amount of graphene.When the content of graphene is 0.03wt %,the maximum values of flexural and compressive strength are 9.6MPa and 62.8MPa respectively at 28 days of age,which are 10.3% and 18.9%higher than that of common blank samples.The results of SEM,FT-IR and XRD of hardened cement show that by adjusting the growth morphology and aggregation state of hydrated crystals,the graphene improves the micropore distribution in hardened cement,the compactness of material increases,and the strength of hardened cement is improved in cement hydration process.