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制备了不同纤维掺量的改性聚酯纤维混凝土,通过纤维分散的图像处理方法研究五种不同搅拌方式对改性聚酯纤维在混凝土中分散性能的影响,并通过耐久性试验研究改性聚酯纤维混凝土的抗碳化、抗氯盐侵蚀和抗冻性能.结果表明,图像处理方法能够较好地评价改性聚酯纤维混凝土中的纤维分散性,认为“砂石胶材60 s+水60 s+纤维60 s”的搅拌方式得到的纤维分散性最好,与肉眼观察的效果一致.掺加改性聚酯纤维能够提高混凝土的抗压强度,掺量为1.1 kg·m-3时提高强度14%左右,继续增大纤维掺量不能持续提升强度.改性聚酯纤维在混凝土中的密集分布能够削弱CO_2的扩散,降低混凝土的碳化速率12.6%~18.9%,纤维掺量越多,抗碳化能力越好.掺加改性聚酯纤维能够降低混凝土的氯离子扩散系数,提高其抗氯离子侵蚀能力.改性聚酯纤维还能有效减少冻融循环过程中表层材料的剥落,大大改善混凝土的抗冻性.
The modified polyester fiber reinforced concrete with different fiber content was prepared. The influence of five different mixing methods on the dispersion properties of modified polyester fiber in concrete was studied by the image processing method of fiber dispersion. The durability of the modified poly Carbon fiber, chloride resistance and frost resistance of ester fiber reinforced concrete.The results show that the image processing method can evaluate the fiber dispersion of modified polyester fiber concrete better, s + fiber 60 s ", the dispersion of the fiber is the best, which is consistent with the macroscopic observation.The addition of modified polyester fiber can improve the compressive strength of concrete, and the content is increased at the dosage of 1.1 kg · m-3 Strength of about 14%, continue to increase the fiber content can not continue to enhance the strength of the dense polyester fiber modified concrete can weaken the diffusion of CO_2, reducing the carbonation rate of concrete 12.6% ~ 18.9%, the more the fiber content, The better the anti-carbonization ability.The modified polyester fiber can reduce the chloride ion diffusion coefficient of concrete and improve the resistance to chloride ion erosion.The modified polyester fiber can also effectively reduce the surface material during the freeze-thaw cycle Fall, greatly improving the frost resistance of concrete.