玄武岩纤维对悬浮密实结构水泥稳定碎石力学性能的影响

doi:10.16552/j.cnki.issn1001-1625.2024.1525

摘要/Abstract

摘要： 水泥稳定碎石是路面基层最常用的材料,玄武岩纤维能够不同程度地改善水泥稳定碎石的力学性能。本文针对悬浮密实结构水泥稳定碎石中粒径4.75 mm以下细集料含量较多的特点,首先研究了玄武岩纤维长度和掺量对水泥稳定细集料抗压强度、抗折强度的影响规律,在此基础上对掺玄武岩纤维水泥稳定碎石整体的力学性能与普通水泥稳定碎石进行了对比。结果表明:不同长度的纤维在1.2‰(质量分数)的掺量下可使水泥稳定细集料的抗压强度、抗折强度达到最高,水泥稳定细集料1.2‰的纤维掺量换算为水泥稳定碎石整体的纤维掺量为0.48‰;将不同长度纤维按0.48‰掺量掺入水泥稳定碎石后发现,掺入12 mm纤维的水泥稳定碎石表现出更高的无侧限抗压强度和劈裂强度;采用12 mm 玄武岩纤维,在0.48‰的掺量下,悬浮密实结构水泥稳定碎石28 d无侧限抗压强度、7 d劈裂强度和14 d弯拉强度分别提高了23.4%、34.2%和34.1%,此外,玄武岩纤维能够降低水泥稳定碎石的抗压回弹模量,其中14 d时的降低幅度达到22.1%。

关键词: 玄武岩纤维, 水泥稳定碎石, 悬浮密实结构, 抗压强度, 纤维掺量, 基层

Abstract: Cement stabilized macadam is the most commonly used material for pavement base. Basalt fiber can enhance the mechanical properties of cement stabilized macadam to different extents. In view of the content of fine aggregate below 4.75 mm is large in cement stabilized macadam with suspended dense structure, the effects of length and content of basalt fiber on the compressive strength and rupture strength of cement stabilized fine aggregate were studied firstly. Based on this, the overall mechanical properties of cement stabilized macadam with basalt fiber and ordinary cement stabilized macadam were compared. The results indicate that the compressive strength and rupture strength of cement stabilized fine aggregate reach highest when the content of fiber with different lengths is 1.2‰ (mass fraction). The fiber content of 1.2‰ in cement stabilized fine aggregate is equivalent to the fiber content of 0.48‰ in cement stabilized macadam. After mixing the fiber of different lengths at content of 0.48‰ into the cement stabilized macadam, it is found that the cement stabilized macadam with 12 mm fiber shows higher unconfined compressive strength and splitting strength. The 28 d unconfined compressive strength, 7 d splitting strength and 14 d flexural-tensile strength of cement stabilized macadam with suspended dense structure increase respectively by 23.4%, 34.2% and 34.1% at the fiber length of 12 mm and content of 0.48‰. In addition, basalt fiber reduces the compressive resilience modulus of cement stabilized macadam, and the reduction rate reaches 22.1% at 14 d.

Key words: basalt fiber, cement stabilized macadam, suspended dense structure, compressive strength, fiber content, road base

中图分类号:

U416

余海龙, 白文鼎, 刘梅芳, 胡力群, 暴英波. 玄武岩纤维对悬浮密实结构水泥稳定碎石力学性能的影响[J]. 硅酸盐通报, 2025, 44(6): 2343-2352.

YU Hailong, BAI Wending, LIU Meifang, HU Liqun, BAO Yingbo. Effect of Basalt Fiber on Mechanical Properties of Cement Stabilized Macadam with Suspended Dense Structure[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(6): 2343-2352.

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