氧化石墨烯增强水泥复合材料的断裂性能  

Fracture properties of graphene oxide reinforced cement composites

作　　者：李欣 罗素蓉[1] LI Xin;LUO Surong(School of Civil Engineering,Fuzhou University,Fuzhou 350116,China)

机构地区：[1]福州大学土木工程学院,福州350116

出　　处：《复合材料学报》2021年第2期612-621,共10页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金海峡联合基金重点项目(U1605242)。

摘　　要：将氧化石墨烯(GO)加入水泥砂浆中,以提高其抗裂性和韧性。通过三点弯曲梁法测试了GO增强水泥砂浆试件的断裂性能,采用双K断裂模型分析了GO掺量对改性水泥砂浆断裂参数的影响。结果表明:GO提高了水泥砂浆试件的起裂韧度,当GO掺量(与胶凝材料质量比)为0.01%~0.07%时,较对照组分别提高了13.4%、25.4%、24.6%和16.7%,但对失稳韧度的影响有限,不同GO掺量水泥砂浆的断裂能较对照组提高了10.7%~33.3%。结合微观试验发现,GO主要通过影响水泥水化过程,优化孔结构,促进高密度水化产物生成,提高水化产物间的粘结力,进而抑制微裂缝生成和发展。In order to improve the toughness of cement-based materials, grapheme oxide(GO) was added into cement mortar. The effect of GO on the fracture properties of cement mortar was tested by three-point bending beam fracture test, and the fracture parameters were obtained through double K fracture model. The results show that GO improves the initial fracture toughness of cement mortar. When the GO content(mass ratio to cementitious material) is 0.01%-0.07%, the initial fracture toughness of GO reinforced cement mortar is increased by 13.4%, 25.4%,24.6% and 16.7%, respectively, compared with the control group. However, the influence of GO on the unstable fracture toughness of cement mortar is limited. The fracture energies of GO reinforced cement mortars with different GO contents are increased by 10.7%-33.3%, compared with the control group. Combined with the microscopic test,it is found that the GO influences the hydration process of cement, optimizes pore structure and promotes the generation of high stiffness hydration products. It also improves the adhesion of hydration products, and further inhibits the generation and development of micro-cracks.

关 键 词：氧化石墨烯 水泥基材料 断裂性能 双K断裂参数 水化产物 

分 类 号：TU528[建筑科学—建筑技术科学]