氧化石墨烯对水泥基复合材料性能影响研究

Effect of Graphite Oxide on Properties of Cement Mortar Composites

采用改进Hummers法和超声分散法制备了氧化石墨烯(GO)片层分散液,研究了GO掺量对水泥砂浆复合材料力学性能、微观结构和抗盐溶液侵蚀性能的影响,并利用X射线能谱仪(EDS)、拉曼光谱仪和透射电镜(TEM)对GO的片层结构进行了表征,结果表明:GO参与调控了水泥水化产物的晶体结构;当GO掺量为0.04%时,水泥水化产物中的针状、棒状和片层状晶体结构的交错更加致密,其抗压强度和抗折强度比未掺加GO的分别提高了39.38%和56.43%;一定掺量的GO能够降低水泥砂浆复合材料的孔隙度,并阻止Cl-和SO42-的侵蚀,减少水泥基复合材料长期浸渍在盐溶液中的质量损失和力学性能的衰减,显著改善了其耐久性。

Graphite oxide(GO) dispersion solutions were prepared by modified Hummers method and ultrasonic treatment. The effect of GO on mechanical properties, microstructure and corrosion resistance with immersed in salt solution of cement mortar composites were researched, respectively. GO nano-platelets structure was investigated by EDS, Raman spectrometer and TEM. The results show that when the dosage of GO is 0.04%, the compressive and flexural strength of GO/cement mortar composites is increased by 39.38% and 56.43% respectively compared with control samples, respectively. In addition, the GO nano-platelets can participate in the hydration reaction and help the cement hydration products to form needle-like, rod-like or lamellar crystal structures. And a certain amount of GO can reduce the porosity of the cement-based composites and prevent the erosion of chloride and sulfate ions. As a result, the durability of cement mortar composites has been improved remarkably.