PP纤维增强水泥基快速修补砂浆的性能分析
Performance Analysis of PP Fiber-reinforced Cement-based Rapid Repair Mortar
以聚丙烯(PP)纤维为增强材料,研究PP纤维对水泥基快速修补砂浆的力学性能、抗冻性和抗裂性能的影响。结果表明:PP纤维能够促进水泥水化,提高基体致密性,而过量PP纤维会导致基体结构劣化。PP纤维在提高砂浆抗折强度、抗压强度和抗冻性能的同时,还能抑制砂浆裂纹发展。综合各项性能,PP纤维最佳掺入质量分数为0.6%,与基准样相比,在3 h、1 d和28 d龄期下,砂浆抗折强度分别提高61.9%、28.4%和48.5%,抗压强度分别提高50.6%、18.2%和12.3%。28 d冻融质量和冻融强度损失分别降低61.7%和79.0%。开裂时间、平均裂纹间距、裂纹起裂荷载、峰值荷载和断裂能分别提高213%、117%、50%、61%和199%,最大裂纹宽度、72 h裂纹数量和裂缝扩展速率分别降低70%、67%和56%。
Polypropylene (PP) fiber was employed as the reinforcing material to investigate its effects on the mechanical properties, frost resistance, and crack resistance of cement-based rapid repair mortar. The results indicated that PP fiber promoted cement hydration and enhanced matrix densification, whereas excessive PP fiber led to matrix structure deterioration. PP fibers not only enhanced the flexural strength, compressive strength, and frost resistance of mortar, but also inhibited the development of cracks in mortar. Based on a comprehensive evaluation of all performance parameters, the optimal mass fraction of PP fiber was determined to be 0.6%. Compared with the reference specimen, the flexural strength of the mortar at 3 h, 1 d, and 28 d curing ages increased by 61.9%, 28.4%, and 48.5%, respectively, while the compressive strength increased by 50.6%, 18.2%, and 12.3%, respectively. The mass loss and strength loss after 28 d freeze-thaw cycles decreased by 61.7% and 79.0%, respectively. The cracking time, average crack spacing, crack initiation load, peak load, and fracture energy increased by 213%, 117%, 50%, 61%, and 199%, respectively, whereas the maximum crack width, 72 h crack number, and crack propagation rate decreased by 70%, 67%, and 56%, respectively.
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河南省高等学校重点科研项目(22A560001)
2024年河南省科学技术厅第六批省科技研发计划联合基金(产业类)项目(245101610063)
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