围压对高温后玄武岩纤维混凝土渗透率及孔隙结构影响
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安徽理工大学

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中国博士后科学基金面上项目(2018M642502);安徽省自然科学基金青年项目(1908085QE185);安徽省高等学校自然科学研究重点项目(KJ2018A0098);国家级大学生创新创业训练计划项目(201910361023)


Effect of Confining Pressure on Permeability and Pore Structure of Basalt Fiber Reinforced Concrete after High Temperature
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Anhui University of Science and Technology

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    摘要:

    玄武岩纤维混凝土的渗透性能对火灾过后构件耐久性评估至关重要,且考虑荷载作用更能够反映实际情况,因此针对高温后玄武岩纤维混凝土开展变围压作用下渗透率测试以及围压作用前后孔隙结构变化特征研究。结果表明变围压作用下渗透率呈负指数函数衰减;掺入玄武岩纤维与未掺入纤维相比,100℃、300℃、600℃高温后两者初始渗透率相差48.16%、33.89%、1.57%;采用围压敏感系数和无因次渗透率对变围压过程渗透率变化情况进行评价,并将整个过程分为敏感区、过渡区和不敏感区。围压作用后原有孔隙结构发生改变,向小尺寸孔隙发展,微孔孔隙占比达到90%以上;孔隙数量也随之减少,因而使得渗透率降低。

    Abstract:

    The permeability of basalt fiber reinforced concrete is critical to the durability assessment of members after fire, and considering the load effect can better reflect the actual members status. For this purpose, the permeability of basalt fiber reinforced concrete after high temperature is tested under variable confining stress, and the change characteristics of pore structure before and after confining stress are studied. The results show that the permeability decreases with a negative exponential function under variable confining pressure. Compared with non-added fiber, the initial permeability of basalt fiber specimens after the temperature of 100 ℃, 300 ℃, and 600 ℃ is 48.16%, 33.89%, 1.57%. The permeability changes at each stage of confining pressure loading is evaluated by confining pressure sensitivity coefficient and dimensionless permeability, which is divided into sensitive zone, transition zone and insensitive zone. The original pore structure of specimen is adjusted after confining pressure, which is reflected in the development to small-size pores, the proportion of micro-pore is more than 90%, and the number of pores decreases, thus reducing the permeability.

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  • 收稿日期:2020-02-15
  • 最后修改日期:2020-04-08
  • 录用日期:2020-04-15
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