Smith-Gillis Reagan, Lopez-Anido Roberto, Rushing Todd S, Landis Eric N
Advanced Structures and Composites Center, University of Maine, Orono, ME 04469, USA.
U.S. Army Engineer Research and Development Center, Vicksburg, MS 39180, USA.
Materials (Basel). 2021 May 12;14(10):2490. doi: 10.3390/ma14102490.
In order to improve flexural and impact performance, thin panels of steel fiber-reinforced ultra-high performance concrete (UHPC) were further reinforced with external layers of continuous fiber-reinforced thermoplastic (CFRTP) composites. CFRTP sheets were bonded to 305 × 305 × 12 mm UHPC panels using two different techniques. First, unidirectional E-glass fiber-reinforced tapes of polyethylene terephthalate glycol-modified (PETG) were arranged in layers and fused to the UHPC panels through thermoforming. Second, E-glass fiber woven fabrics were placed on the panel faces and bonded by vacuum infusion with a methyl methacrylate (MAA) polymer. Specimens were cut into four 150 mm square panels for quasi-static and low-velocity impact testing in which loads were applied at the panel centers. Under quasi-static loading, both types of thermoplastic composite reinforcements led to a 150-180% increase in both peak load capacity and toughness. Impact performance was measured in terms of both residual deformation and change in specimen compliance, and CFRTP additions were reduced both by 80% to 95%, indicating an increase in damage resistance. While both reinforcement fabrication techniques provided added performance, the thermoforming method was preferable due to its simplicity and fewer specialized tool requirements.
为了提高弯曲和冲击性能，钢纤维增强超高性能混凝土（UHPC）薄板用连续纤维增强热塑性（CFRTP）复合材料外层进一步增强。采用两种不同技术将CFRTP片材粘结到305×305×12mm的UHPC板上。首先，将聚对苯二甲酸乙二醇酯改性（PETG）的单向E玻璃纤维增强带分层排列，并通过热成型熔合到UHPC板上。其次，将E玻璃纤维织物放置在板面上，并通过用甲基丙烯酸甲酯（MAA）聚合物进行真空灌注粘结。将试件切割成四块150mm见方的板，用于准静态和低速冲击试验，在试验中，载荷施加在板的中心。在准静态加载下，两种类型的热塑性复合材料增强材料都使峰值承载能力和韧性提高了150%-180%。冲击性能通过残余变形和试件柔度变化来衡量，添加CFRTP后，二者均降低了80%至95%，表明抗损伤能力有所提高。虽然两种增强材料制造技术都提高了性能，但热成型方法因其简单且对专用工具要求较少而更可取。
