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改性聚酯纖維在混凝土中的分散性及對耐久性的影響

Dispersivity of modified polyester fibers in concrete and its influence on the durability of concrete

  • 摘要: 制備了不同纖維摻量的改性聚酯纖維混凝土,通過纖維分散的圖像處理方法研究五種不同攪拌方式對改性聚酯纖維在混凝土中分散性能的影響,并通過耐久性試驗研究改性聚酯纖維混凝土的抗碳化、抗氯鹽侵蝕和抗凍性能.結果表明,圖像處理方法能夠較好地評價改性聚酯纖維混凝土中的纖維分散性,認為“砂石膠材60S+水60S+纖維60S”的攪拌方式得到的纖維分散性最好,與肉眼觀察的效果一致.摻加改性聚酯纖維能夠提高混凝土的抗壓強度,摻量為1.1kg·m-3時提高強度14%左右,繼續增大纖維摻量不能持續提升強度.改性聚酯纖維在混凝土中的密集分布能夠削弱CO2的擴散,降低混凝土的碳化速率12.6%~18.9%,纖維摻量越多,抗碳化能力越好.摻加改性聚酯纖維能夠降低混凝土的氯離子擴散系數,提高其抗氯離子侵蝕能力.改性聚酯纖維還能有效減少凍融循環過程中表層材料的剝落,大大改善混凝土的抗凍性.

     

    Abstract: Modified polyester fiber reinforced concrete with different additions was prepared. The dispersivity of modified polyester fibers in concrete by five different mixing methods was studied by an image processing method. With a series of durability tests, the carbonation resistance, chloride penetration resistance and frost resistance of the fiber reinforced concrete were also investigated. The results indicate that the image processing method can evaluate the dispersivity of the fiber reinforced concrete well. The mixing method of "aggregate and binding materials for 60 s + water for 60 s + fiber for 60 s" makes the best dispersivity of modified polyester fibers. It is in accord with direct observations by naked eyes. The compressive strength is increased by the addition of modified polyester fibers. After adding 1.1 kg·m-3 modified polyester fibers, the compressive strength of concrete increases by 14%; but with more modified polyester fibers, the compressive strength no longer increases. The existence of modified polyester fibers in concrete can slow down the diffusion of CO2, the carbonation rate of concrete decreases by 12.6% to 18.9%, and with more modified polyester fibers, the carbonation resistance became better. After the addition of modified polyester fibers, the chloride diffusion coefficient of concrete also decreases. The modified polyester fibers can reduce the surface spalling of concrete during freeze-thaw cycles, which improves the frost resistance of concrete significantly.

     

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