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冰川冻土 ›› 2018, Vol. 40 ›› Issue (2): 355-361.doi: 10.7522/j.issn.1000-0240.2018.0040

• 寒区科学与技术 • 上一篇    下一篇

高寒地区水镁石纤维早强型水泥稳定碎石的路用性能研究

盛燕萍1, 李亮亮1, 关博文1, 周辉丽2, 何锐1, 陈华鑫1   

  1. 1. 长安大学 材料科学与工程学院, 陕西 西安 710064;
    2. 青海省交通科学研究院, 青海 西宁 810008
  • 收稿日期:2017-06-11 修回日期:2017-12-06 出版日期:2018-04-25 发布日期:2018-07-02
  • 作者简介:盛燕萍(1981-),女,浙江临安人,教授,2010年在长安大学获博士学位,从事道路结构与材料方面研究.E-mail:shengyanping2003@163.com
  • 基金资助:
    国家重点研发计划项目(2017YFB0309903-02);青海省科技计划项目(2017-ZJ-763;2017-ZJ-764;2017-ZJ-715);中央高校基本科研业务费专项资金项目(310821171115;300102218502)资助

Study on the performance of gravel road stabilized by early strength agent and brucite fibers in alpine regions

SHENG Yanping1, LI Liangliang1, GUAN Bowen1, ZHOU Huili2, HE Rui1, CHEN Huaxin1   

  1. 1. School of Materials Science and Engineering, Chang'an University, Xi'an 710064, China;
    2. Qinghai Research Institute of Transportation, Xining 810008, China
  • Received:2017-06-11 Revised:2017-12-06 Online:2018-04-25 Published:2018-07-02

摘要: 为了提高水泥稳定类基层在高寒地区的适用性,提出在基层中复掺基层早强剂和水镁石矿物纤维使其达到早强抗裂作用,通过研究其抗压强度、劈裂强度、收缩特性以及抗冻性能,分析水镁石矿物纤维在水泥稳定碎石中的作用机理。试验结果表明:复掺基层早强剂和水镁石矿物纤维后,20℃养护条件下基层3 d抗压强度与劈裂强度分别为其28 d的85%和76%,-15℃低温养护条件下3 d抗压强度与劈裂强度分别为其28 d的69%和68%;抗收缩性能在加入水镁石纤维后有较大提高,纤维掺量为4%时,干缩系数与温缩系数比未掺时分别降低约92%和48%;抗冻性能也因掺入水镁石纤维而有所改善,纤维掺量为4%时基层28 d冻融残留抗压强度比(BDR)为0.96%。复掺水镁石纤维与基层早强剂,既能有效保证高寒地区水稳碎石的强度,又能避免基层在干燥气候中的收缩开裂和在低温、变温环境中的温缩开裂,其中水镁石纤维最佳掺量为4%。

关键词: 高寒地区, 水泥稳定碎石, 水镁石纤维, 基层早强剂, 路用性能

Abstract: Aiming to improve the adaptability of cement stabilized macadam base in the alpine regions, both early strength agent and brucite fiber were added to the basement layer. The performances, such as compressive strength, splitting tensile strength, shrinkage and frost resisting property of the base were studied. Also, the effect of adding brucite mineral fiber to cement-stabilized macadam was analyzed. Test results showed that after adding early strength agent and brucite fiber both, compressive strength and the splitting tensile strength of the base reached 85% after 3 days and reached 76% after 28 days, respectively, under curing at 20℃. Meanwhile, compressive strength and splitting tensile strength of the base in 3 days reached 69% and 68% in 28 days, respectively, under curing at -15℃. The anti-shrinkage properties of the base was improved by adding brucite fiber at the optimum mix amount of 4%, as a result, the dry shrinkage coefficient and shrinkage coefficient of the base were reduced by about 92% and 48%, respectively, compared to that without brucite fiber. Meanwhile, frost resistance of the base was improved as well, for example, when the optimum mix amount was also 4%, the BDR of the base would be 0.96%. Through the experiments, the following conclusion can be drawn:the addition of both early strength agent and brucite fiber in the base can not only improve the strength of the base but also prevent shrinkage and low temperature cracking. The optimum mix amount is 4% in the base.

Key words: alpine regions, cement stabilized macadam, brucite fiber, early strength agent, road performance

中图分类号: 

  • U414.1