纤维对深部隧道用高性能混凝土渗透性能的影响

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发布时间：2020-01-06 00:00:00

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纤维对深部隧道用高性能混凝土渗透性能的影响

Effects of Fibers on Permeability of High Performance Concrete for Deep Tunnels

２０19年第12期

深部隧道；高性能混凝土；纤维；力学性能；渗透性能

Deep tunnel; High performance concrete; Fiber; Mechanical properties; Permeability

２０19年第12期

10.19761/j.1000-4637.2019.12.048.04

国家重点研发计划项目（2018YFC0705404）；国家自然科学基金资助项目（51878480、51678442、51878481、51878496）；国家高铁联合基金项目（U1534207）；中央高校基本科研业务费专项资金资助项目。

郭秋生，陈庆，蒋正武，何倍，徐春普

同济大学材料科学与工程学院先进土木工程材料教育部重点实验室，上海 201804

郭秋生，陈庆，蒋正武，何倍，徐春普

郭秋生,陈庆,蒋正武,等.纤维对深部隧道用高性能混凝土渗透性能的影响[J].混凝土与水泥制品,2019(12):48-51.

GUO Q S,CHEN Q,JIANG Z W,et al.Effects of Fibers on Permeability of High Performance Concrete for Deep Tunnels[J].China Concrete and Cement Products,2019(12):48-51.

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1000

摘要：研究了不同纤维掺加方式与掺量对深部隧道用C50高性能混凝土力学性能、抗氯离子侵蚀性能和表面透气性能的影响，并对其影响机理进行了分析。结果表明，纤维的掺入能显著提高混凝土的力学性能；当聚丙烯纤维体积掺量为0.6%时，混凝土的力学性能最好，28 d抗压强度和劈裂抗拉强度相比于对照组分别提高了9.3%和13.2%，而混杂纤维混凝土的抗压强度和劈裂抗拉强度都有一定的降低；混杂纤维对提高混凝土抗氯离子性能和降低表面透气性能的作用明显优于单种纤维，混杂纤维混凝土56 d电通量比单掺0.3%的聚丙烯纤维混凝土和单掺0.6%的木质素纤维混凝土分别降低了19.1%和15.5%，56 d表面透气系数则分别降低了42.3%和16.7%；纤维不仅能够填充混凝土内部的孔隙裂缝，还能消除混凝土内部“积水”，促进未水化水泥颗粒水化，使混凝土更加密实，从而提高混凝土的抗渗性和耐久性。 Abstract: The effects of mixing methods and dosages of different fibers on mechanical properties, resistance to chloride ion erosion and surface gas permeability of C50 high performance concrete for deep tunnels were studied, and the influence mechanism was analyzed. The results show that the incorporation of fibers can significantly improve the mechanical properties of concrete, when the volume of polypropylene fiber is 0.6%, the mechanical properties of concrete are the best. Compared with the control group, the 28 days compressive strength and splitting tensile strength of concrete increase by 9.3% and 13.2%, respectively, while the compressive strength and splitting tensile strength of multi-mixed fiber concrete decrease. The effects of multi-mixed fibers on improving the chloride ion resistance of concrete and reducing the surface gas permeability are obviously better than that of single-mixed fiber, the 56 days electric flux of multi-mixed fiber concrete decrease by 19.1% and 15.5%, which is lower than that of 0.3% polypropylene fiber concrete and 0.6% lignin fiber concrete, and the 56 days surface air permeability coefficient of multi-mixed fiber concrete decrease by 42.3% and 16.7%. The fiber can not only fills the pore cracks in concrete, but also eliminate the "water accumulation" inside concrete and promote the hydration of the unhydrated cement particles, thereby improving the impermeability and durability of the concrete.

英文名 : Effects of Fibers on Permeability of High Performance Concrete for Deep Tunnels

刊期 : ２０19年第12期

关键词 : 深部隧道；高性能混凝土；纤维；力学性能；渗透性能

Key words : Deep tunnel; High performance concrete; Fiber; Mechanical properties; Permeability

刊期 : ２０19年第12期

DOI : 10.19761/j.1000-4637.2019.12.048.04

文章编号 :

基金项目 : 国家重点研发计划项目（2018YFC0705404）；国家自然科学基金资助项目（51878480、51678442、51878481、51878496）；国家高铁联合基金项目（U1534207）；中央高校基本科研业务费专项资金资助项目。

作者 : 郭秋生，陈庆，蒋正武，何倍，徐春普

单位 : 同济大学材料科学与工程学院先进土木工程材料教育部重点实验室，上海 201804

郭秋生，陈庆，蒋正武，何倍，徐春普

郭秋生,陈庆,蒋正武,等.纤维对深部隧道用高性能混凝土渗透性能的影响[J].混凝土与水泥制品,2019(12):48-51.

GUO Q S,CHEN Q,JIANG Z W,et al.Effects of Fibers on Permeability of High Performance Concrete for Deep Tunnels[J].China Concrete and Cement Products,2019(12):48-51.

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摘要

参数

结论

参考文献

引用本文

摘要：研究了不同纤维掺加方式与掺量对深部隧道用C50高性能混凝土力学性能、抗氯离子侵蚀性能和表面透气性能的影响，并对其影响机理进行了分析。结果表明，纤维的掺入能显著提高混凝土的力学性能；当聚丙烯纤维体积掺量为0.6%时，混凝土的力学性能最好，28 d抗压强度和劈裂抗拉强度相比于对照组分别提高了9.3%和13.2%，而混杂纤维混凝土的抗压强度和劈裂抗拉强度都有一定的降低；混杂纤维对提高混凝土抗氯离子性能和降低表面透气性能的作用明显优于单种纤维，混杂纤维混凝土56 d电通量比单掺0.3%的聚丙烯纤维混凝土和单掺0.6%的木质素纤维混凝土分别降低了19.1%和15.5%，56 d表面透气系数则分别降低了42.3%和16.7%；纤维不仅能够填充混凝土内部的孔隙裂缝，还能消除混凝土内部“积水”，促进未水化水泥颗粒水化，使混凝土更加密实，从而提高混凝土的抗渗性和耐久性。
Abstract: The effects of mixing methods and dosages of different fibers on mechanical properties, resistance to chloride ion erosion and surface gas permeability of C50 high performance concrete for deep tunnels were studied, and the influence mechanism was analyzed. The results show that the incorporation of fibers can significantly improve the mechanical properties of concrete, when the volume of polypropylene fiber is 0.6%, the mechanical properties of concrete are the best. Compared with the control group, the 28 days compressive strength and splitting tensile strength of concrete increase by 9.3% and 13.2%, respectively, while the compressive strength and splitting tensile strength of multi-mixed fiber concrete decrease. The effects of multi-mixed fibers on improving the chloride ion resistance of concrete and reducing the surface gas permeability are obviously better than that of single-mixed fiber, the 56 days electric flux of multi-mixed fiber concrete decrease by 19.1% and 15.5%, which is lower than that of 0.3% polypropylene fiber concrete and 0.6% lignin fiber concrete, and the 56 days surface air permeability coefficient of multi-mixed fiber concrete decrease by 42.3% and 16.7%. The fiber can not only fills the pore cracks in concrete, but also eliminate the "water accumulation" inside concrete and promote the hydration of the unhydrated cement particles, thereby improving the impermeability and durability of the concrete.

关键词:

深部隧道；高性能混凝土；纤维；力学性能；渗透性能

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