Li Qiuhong, Li Yinlong, Zhang Yong, Han Yongrui
School of Civil Engineering and Architecture, NanChong Vocational and Technical College, Nanchong, Sichuan 637000, China.
Int J Anal Chem. 2022 Nov 9;2022:3562209. doi: 10.1155/2022/3562209. eCollection 2022.
In order to solve the problem of drying shrinkage of cement-based carbon fiber materials in the early stage of hardening, the author proposes the application of cement-based carbon fiber materials in the construction of building durability. The author uses a self-designed fast ring test method to test and study the drying shrinkage performance of cement-based carbon fiber materials in the early stage of hardening. The results showed that the addition of MP-I and MP-II fibers, which can significantly reduce shrinkage cracking in plastic concrete, has little effect on preventing the shrinkage and cracking of concrete in the early stage of hardening. Mixed with a certain amount of steel fiber, carbon fiber, MH-I, and MPH-I hardened anticrack fiber, all have a better effect on preventing early water loss and drying shrinkage of hardening. The MH-I and MPH-I hardening anticracking fibers have an economical and feasible dosage, and the early water loss shrinkage and crack reduction rates of concrete hardening are 71.2% and 79.0%, respectively. MH-I fibers have no anticracking effect in the plastic stage and are only suitable for shrinkage and crack prevention of concrete in the early stage of hardening, while MPH-I hardened anticrack fibers have a 100% crack-reducing effect in the plastic stage, it is an engineering fiber material that can simultaneously prevent the plasticity and early hardening of concrete from shrinkage and cracking. The application of MPH-I hardened anticrack fiber is of great significance to improve the quality of structural engineering.
为解决水泥基碳纤维材料硬化初期的干燥收缩问题，作者提出将水泥基碳纤维材料应用于建筑耐久性施工中。作者采用自行设计的快速圆环试验方法，对水泥基碳纤维材料硬化初期的干燥收缩性能进行测试研究。结果表明，添加MP - I和MP - II纤维虽能显著减少塑性混凝土的收缩开裂，但对防止混凝土硬化初期的收缩开裂作用不大。与一定量的钢纤维、碳纤维、MH - I和MPH - I硬化抗裂纤维混合，均对防止硬化初期水分散失和干燥收缩有较好效果。MH - I和MPH - I硬化抗裂纤维用量经济可行，混凝土硬化初期水分散失收缩率和裂缝减少率分别为71.2%和79.0%。MH - I纤维在塑性阶段无抗裂效果，仅适用于混凝土硬化初期的收缩和防裂，而MPH - I硬化抗裂纤维在塑性阶段有100%的减裂效果，是一种能同时防止混凝土塑性和硬化初期收缩开裂的工程纤维材料。MPH - I硬化抗裂纤维的应用对提高结构工程质量具有重要意义。
