基于建筑施工造价管理的碳纤维复合材料开发与应用

Development and Application of Carbon Fiber Composites Based on Construction Cost Management

基于建筑施工造价管理需要对建筑工程用碳纤维进行了表面改性处理,研究了碳纤维掺量和碳纤维长短对复合材料抗压强度和抗折强度的影响。结果表明,碳纤维与 SiO_(2)涂层改性碳纤维掺量对水泥基复合材料强度的影响趋势相同,即水泥基复合材料的抗折强度随着碳纤维掺量或者碳纤维长度增加逐渐增大,而抗压强度随碳纤维掺量增加先增大后减小,在碳纤维或 SiO_(2)涂层改性碳纤维掺量达到 0.6% 时取得抗压强度最大值。相同纤维掺量和相同纤维长度前提下,SiO_(2)涂层改性碳纤维对水泥基复合材料的改善效果优于未改性的碳纤维。涂层改性碳纤维和碳纤维增强水泥基复合材料的破坏机制都为纤维拔出破坏和断裂破坏,但是 SiO_(2)涂层改性碳纤维与基体的粘合力更强而造成拔出破坏更为显著。

Based on the needs of construction cost management, the surface of carbon fiber for construction engineering was modified, and the eff ects of carbon fiber content and carbon fiber length on the compressive strength and fiexural strength of carbonfiber / SiO_(2) coating modified carbon fiber cement-based composites were studied. The results show that the change trend of strength of cement-based composites with the content of carbon fiber modified by SiO_(2) coating is the same as that of carbon fiber reinforced cement-based composites, that is, with the increase of carbon fiber content or carbon fiber length, the fiexural strength of cementbased composites gradually increases, while the compressive strength first increases and then decreases with the increase of carbonfiber content. The maximum compressive strength was obtained when the content of carbon fiber or carbon fiber modified by SiO_(2) coating reached 0.6%. On the premise of the same content and length of fiber, the improvement eff ect of SiO_(2) coated carbon fiber on cement-based composites is better than that of unmodified carbon fiber. The failure mechanisms of coated carbon fiber and carbonfiber reinforced cement-based composites are fiber pull-out failure and fracture failure, but the pull-out failure caused by the stronger adhesion between SiO_(2) coated carbon fiber and matrix is more significant.