河南城建学院学报2026，Vol.35Issue(3)：9-16,8.DOI:10.14140/j.cnki.hncjxb.2026.03.002
固定掺量聚丙烯纤维对水泥砂浆力学及干缩性能影响
The influence of polypropylene fiber with fixed content on the mechanical and drying shrinkage properties of cement mortar
摘要
Abstract
To address the issue of durability degradation caused by through cracks due to drying shrinkage in cement-based materials,a systematic study was conducted on the effects of different lengths of polypro-pylene fibers(6 mm,9 mm,12 mm)and their combinations on the mechanical properties and drying shrinkage behavior of cement mortar under the condition of a fixed mass content(1.0%).The microscopic mechanism was analyzed using scanning electron microscopy(SEM).The results showed that the incorpora-tion of polypropylene fibers significantly improved the mechanical and drying shrinkage properties of the mortar.When 9 mm fibers were incorporated alone,the 28-day flexural strength of the mortar reached 7.5 MPa,an increase of 22.95%compared to the control group.The 28-day compressive strength of the mortar in the three-length hybrid group was 36.06 MPa,an increase of 19.21%compared to the control group.The combination of three-length fibers effectively suppressed drying shrinkage,with a shrinkage rate of 0.123 3%at 28 days,a reduction of 16.52%compared to the control group.SEM observations revealed that sin-gle-length fibers mainly enhanced crack restraint through interfacial bonding,while three-length fibers formed a three-dimensional network structure within the matrix,synergistically improving the comprehensive performance of the mortar关键词
聚丙烯纤维/干燥收缩/力学性能/扫描电镜Key words
polypropylene fiber/drying shrinkage/mechanical properties/scanning electron microscope分类
建筑与水利引用本文复制引用
栾利强,李晓龙,石云升,陈耀鹏..固定掺量聚丙烯纤维对水泥砂浆力学及干缩性能影响[J].河南城建学院学报,2026,35(3):9-16,8.基金项目
国家自然科学基金项目(51369010) （51369010）
广西科技计划项目(AD-25069101) （AD-25069101）
