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碳纸与碳布二者有何区别？

2021-11-16 00:00

碳纤维材料混凝土结构加固修补的研究始于80年代的美日等发达国家。 中国的这项技术起步较晚，但随着中国经济建设和交通事业的迅速发展，碳纸与碳布的强化应用得到大力推进，发展迅速。碳纤维加固有碳纤维布加固和碳纤维板加固两种应用形式，两者在结构承载力提高幅度上存在差异。

说到碳纸与碳布，是由碳纤维材料制成的，但两者有差异，碳纤维布顾名思义，与布相似，重量轻，厚度薄，布料柔软，可以裁断，用碳素丝编织。碳纤维布的厚度为300g的0.167mm，200g的0.111mm。碳纸与碳布适用于建筑物使用载荷增加、工程使用功能变更、材料老化、混凝土强度等级低于设计值、结构裂缝处理、恶劣环境服役构件修理、处理防护的加固工程。 在结构抗剪切、抗震、抗弯曲方面有很大帮助。在使用上，可以根据工程需要粘贴成多层。碳纤维同时贴在多层上，CCM膜电极在拉伸力衰减的问题上会存在一定的浪费，因此建议不要超过4层。

碳纤维板是碳纤维原丝和树脂固化的碳纤维复合材料，类似于钢板。碳纤维板的厚度为1.2mm和1.4mm，还有2.0mm和3.0mm。对防止结构失稳较好，常用于桥梁等加固工程。

仅从抗拉强度来看，规格要求I级碳纤维布达到3400MPa，高于I级碳纤维板2400MPa。但是，在实际加强中，CCM膜电极承载力的提高也与截面厚度有关，如果进行这样的对比，则在同样为10cm宽的情况下，1.2mm厚的碳纤维板能够提供的力为1.2×2400×100=288000N，I级300g的碳纤维布为300g，根据力学性能的计算，一块碳纤维板可以相当于4~8块碳纤维布，如果碳纸与碳布的层数超过4层，建议更换为碳纤维板的加强来实现。

使用哪个好一些呢？具体的应用因加固工程的实际情况而异，只有哪个材质更合适。由于碳板比较硬，碳纤维布比较柔软，因此在使用场景中有时会将碳纤维布应用于圆柱或不规则形状的结构，碳纸与碳布用于桥底或地板等比较平坦的地方。每个产品都有各自的优点和缺点，但在使用上根据情况进行选择！

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