纤维改性水泥基材料研究进展:水泥稳定基层

摘要/Abstract

摘要： 为进一步提升路面半刚性基层抗裂性,促进纤维水泥稳定基层材料应用与发展,本文系统梳理了水泥稳定基层用纤维类型及其物化特性,厘定了水泥稳定基层用纤维适宜长度及掺量,对比评价了不同类型纤维水泥稳定基层力学性能和变形特性,并进一步分析了纤维水泥稳定基层增韧抗裂机理。结果表明:聚酯纤维长度及掺量最大,分别集中于15~50 mm、0.06%~0.08%(质量分数);经纤维改性后水泥稳定基层力学性能及变形特性明显改善,其中,聚乙烯醇(PVA)纤维水泥稳定基层28 d无侧限抗压强度提升程度达6%~34%,聚丙烯纤维水泥稳定基层及PVA纤维水泥稳定基层28 d劈裂强度提升程度均值分别为30%、18%;此外,聚丙烯纤维对水泥稳定基层28 d干缩系数改善效果最优,可降低18%~37%,而PVA纤维水泥稳定基层28 d温缩系数降低程度均值为23%,90 d龄期温缩系数降低程度集中于6%~22%,均处于较高水平;分析纤维水泥稳定基层材料增韧原理可知,纤维主要通过桥接作用削弱基层内部应力集中现象,延缓裂缝发展。

关键词: 道路工程, 纤维, 水泥稳定基层, 力学性能, 变形特性, 增韧机理

Abstract: To improve the crack resistance of pavement semi-rigid base, and promote the application and development of fiber cement stabilized base materials, the fiber types, physical and chemical properties were systematically combed, and the suitable length and content of fiber for cement stabilized base were determined. The mechanical properties and deformation characteristics of different types of fiber cement stabilized base were compared and evaluated, and the toughening and crack resistance mechanism of fiber cement stabilized base was further analyzed. The results show that, in terms of length and content, polyester fiber data is concentrated in 15~50 mm and 0.06%~0.08% (mass fraction), which are higher than other fibers. The mechanical properties and deformation characteristics of cement stabilized base modified by fibers have significantly improved. Among them, the 28 d unconfined compressive strength of the polyvinyl alcohol (PVA) fiber cement stabilized base has been improved by 6%~34%, and the average improvement in the 28 d splitting strength of the polypropylene fiber cement stabilized base and PVA fiber cement stabilized base is 30% and 18%, respectively. In addition, polypropylene fiber has the best effect on improving the dry shrinkage coefficient of cement stabilized base at 28 d, which can be reduced by about 18%~37%. The average reduction in the 28 d temperature shrinkage coefficient of PVA fiber cement stabilized base is 23%, and the data of 90 d temperature shrinkage coefficient is concentrated in 6%~22%, both at a high level. By analyzing the toughening principle of fiber cement stabilized base material, it can be seen that the fiber mainly weakens the internal stress concentration of the base through bridging effect and delays the development of cracks.

Key words: road engineering, fiber, cement stabilized base, mechanical property, deformation characteristic, toughening mechanism

中图分类号:

U416

陈峰, 仪珂, 王朝辉, 党武娟, 屈希峰. 纤维改性水泥基材料研究进展:水泥稳定基层[J]. 硅酸盐通报, 2024, 43(9): 3479-3493.

CHEN Feng, YI Ke, WANG Chaohui, DANG Wujuan, QU Xifeng. Research Progress of Fiber Modified Cement-Based Materials: Cement Stabilized Base[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(9): 3479-3493.

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