[1]肖庆一,苏刚,张宝虎,等.聚丙烯纤维对二灰稳定红黏土路用性能的影响及微观机理分析[J].长安大学学报(自然科学版),2021,41(5):34-42.
 XIAO Qing yi,SU Gang,ZHANG Bao hu,et al.Effect of polypropylene fiber on road performance of limeash stabilizedred clay and analysis of microscopic mechanism[J].Journal of Chang’an University (Natural Science Edition),2021,41(5):34-42.
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聚丙烯纤维对二灰稳定红黏土路用性能的影响及微观机理分析()
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长安大学学报(自然科学版)[ISSN:1006-6977/CN:61-1281/TN]

卷:
第41卷
期数:
2021年5期
页码:
34-42
栏目:
道路工程
出版日期:
2021-09-15

文章信息/Info

Title:
Effect of polypropylene fiber on road performance of limeash stabilizedred clay and analysis of microscopic mechanism
作者:
肖庆一苏刚张宝虎孙立东龚芳媛
(1. 河北工业大学 土木与交通学院,天津 300401; 2. 天津市公路工程总公司,天津 300280;3. 天津南港工业区规划建设局,天津 300280)
Author(s):
XIAO Qingyi1 SU Gang1 ZHANG Baohu2 SUN Lidong3 GONG Fangyuan1
(1. School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China;2. Tianjin Highway Engineering Corporation, Tianjin 300280, China; 3. Nangang Industrial ZonePlanning and Construction Bureau, Tianjin 300280, China)
关键词:
道路工程聚丙烯纤维二灰稳定红黏土力学性能水稳定性能微观机理
Keywords:
road engineering polypropylene fiber limeash stabilized red clay mechanical property moisture stability microscopic mechanism
文献标志码:
A
摘要:
为了解决二灰稳定红黏土容易出现脆性破坏、水稳定性差等问题,达到增强二灰稳定红黏土材料的韧性以及水稳定性能的目的,采用掺量(质量分数,下同)0%、0.15%、0.3%、0.45%、0.6%的聚丙烯纤维对二灰稳定红黏土进行加固,并通过力学性能试验、水稳定性试验、X射线衍射试验及扫描电镜试验,分析其力学性能、水稳性能以及微观作用机理。研究结果表明:二灰稳定红黏土的力学性能随着养护周期的延长而不断增强,60 d内材料的性能提升最明显,60 d之后性能增幅变小,直至性能稳定;聚丙烯纤维明显增强了二灰稳定红黏土的后期抗压性能与抗拉强度,前期对材料的力学与收缩特性影响不大;聚丙烯纤维掺量的增加会使得材料的劈裂强度先升高再降低,纤维的作用由一开始的提升材料内部机械咬合力转为纤维数量过多导致形成隔断面;聚丙烯纤维的加入有助于改善二灰稳定红黏土的劈裂强度、抗压回弹模量、抗压强度以及水稳定性能,但主要在养护后期体现,且存在最佳纤维掺量0.45%;纤维通过在基体中的空间分布和黏附针状结晶物质增大与土体之间的接触面积与咬合程度,减少土体中的渗水通道,提高了材料抗压性、韧性与水稳定性。聚丙烯纤维加固二灰稳定红黏土从技术性能上可以用于公路基层或底基层材料使用,有效缓解废弃红黏土环境污染和资源浪费问题。
Abstract:
In order to solve the problems of brittle failure and poor water stability of the limash stabilized red clay, and achieve the purpose of enhancing the toughness and water stability of the limash stabilized red clay material, 0%, 0.15%, 0.3%, 0.45%, 0.6% polypropylene fiber content (mass fraction, the same below) reinforced the limash stabilized red clay, and based on the mechanical properties of the polypropylene fiber reinforced limash stabilized red clay through mechanical performance test, water stability test, Xray diffraction test and scanning electron microscope test, water stability and microscopic mechanism of action were analyzed. The results show that the mechanical properties of the limeash stabilized red clay continue to increase with the extension of the curing cycle. The performance of the material is improved most obviously within 60 days, and the performance increase range becomes smaller after 60 days until the performance is stable. Polypropylene fiber significantly strengthens the limeash stabilizes the compressive performance and tensile strength of the red clay in the later stage, and has little effect on the mechanical and shrinkage characteristics of the material in the early stage. The increase in the proportion of polypropylene fiber blending will make the splitting strength of the material first increase and then decrease, the role of fiber will change from the initial increase of the internal mechanical bite force of the material to the excessive number of fibers resulting in the formation of a partition. The addition of polypropylene fibers can help improve the splitting strength, compressive elastic modulus, and compressive strength of the lime stabilized red clay strength and water stability, but it is mainly manifested in the later period of curing, and there is an optimal fiber content 0.45%. The fiber is distributed in the matrix and adheres to the needleshaped crystalline material to increase the contact area with the soil. The degree of occlusion reduces the water seepage channels in the soil and improves the materials compression resistance, toughness and water stability. The polypropylene fiber reinforced limash stabilized red clay can be used as a road base or subbase material in terms of technical performance, which effectively alleviates the environmental pollution and resource waste of the waste red clay. 4 tabs, 10 figs, 28 refs.

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更新日期/Last Update: 2021-09-30