具有大规模规整致密花状微观结构形貌高/超高性能氧化石墨烯/水泥基复合材料

High/Ultra-high Performance Graphene Oxide/Cement-based Composites with Large-scale,Ordered and Compact Flower-like Microstructures

通过掺入氧化石墨烯(GO)及调控水灰比制备了高性能及超高性能水泥基复合材料,当水灰比为0.26及GO掺量为0.03%和0.05%时,水泥基复合材料的抗压强度和抗折强度分别为125.6 MPa、146.7 MPa和15.6 MPa、18.3 MPa。当水灰比为0.18及GO掺量为0.03%和0.05%时,水泥基复合材料的抗压强度和抗折强度分别为168.6 MPa、181.3 MPa和26.9 MPa、29.4MPa。水泥基复合材料的抗渗透、抗冻融、抗碳化等性能得到了显著提高。通过SEM观察水泥基体的微观形貌,发现水泥水化产物成为了形状规整的水化晶体,并且交织交联成为规整致密的花状微观形貌。XRD结果表明,规整形状水化晶体是由多种水泥水化晶体复合杂化形成的复合晶体。

The high-and ultra-high-performance cement composites(HPC and UHPC)were prepared by doping graphene oxide(GO)and varying water-cement ratio.When water-cement ratio is 0.26 and GO dosage is 0.03%and 0.05%,the compressive and flexural strength of HPC were 125.6 MPa,146.7 MPa and 15.6 MPa,18.3 MPa,respectively.And while water-cement ratio is 0.18 and with 0.03%and 0.05%GO,the compressive and flexural strength were 168.6 MPa,181.3 MPa and 26.9 MPa and 29.4 MPa,respectively.The penetration resistance,freeze-thaw resistance and carbonation resistance of the cement composites got remarkably improved by properly adding GO.The regular-shaped crystals of cement hydration products which gathered to form ordered and compact microstructures were observed in SEM microscopic morphology.XRD results indicated that the regular-shaped hydration crystals were constructed by complexing and hybridizing.of cement hydration crystals.