磁场诱导定向碳纤维增强水泥砂浆的力学性能

首次利用磁场诱导定向技术，制备了具有明显择优取向的碳纤维增强水泥砂浆，表征与测试了不同水灰比、龄期和纤维掺量的水泥砂浆的碳纤维取向、抗压和劈裂抗拉强度，研究了碳纤维的取向性对力学性能提升效果的影响。结果表明:水灰比、纤维掺量对碳纤维的取向性有显著影响；相较于无择优取向的普通碳纤维增强水泥砂浆，经磁场诱导定向的碳纤维增强水泥砂浆的劈裂抗拉强度有显著增加，而抗压强度无明显变化；相同水灰比下，纤维取向和纤维掺量是影响定向碳纤维增强水泥砂浆劈裂抗拉强度的主要因素。其中，定向碳纤维增强水泥砂浆劈裂抗拉强度增强效率的最佳碳纤维掺量为水泥的0.50%。 

Mechanical properties of cement mortar reinforced with aligned carbon fibers by magnetic field

The aligned carbon fiber reinforced cement mortar was prepared by magnetic field induced orientation technology. The carbon fiber orientations, compression strengths and splitting tensile strengths of cement mortars with different water-cement ratios, ages and fiber contents were measured. The effects of carbon fiber content and orientation on the mechanical properties of prepared cement mortars were studied. The results show that the water-cement ratio and fiber content have a significant effect on the orientation of carbon fiber. Besides, compared with the ordinary carbon fiber reinforced cement mortar, the aligned carbon fiber reinforced cement mortar has a significant increase in the splitting tensile strength, while exhibits no obvious change in the compressive strength. With the same water-cement ratio, the fiber orientation and fiber content are the main factors affecting the splitting tensile strength of aligned carbon fiber reinforced cement mortar. Especially, the optimum content of carbon fiber in the aligned carbon fiber reinforced cement is 0.50% of the cement mass, which has the highest increasing ratio of splitting tensile strength.