| 摘要: |
| 针对煤矸石粉替代率50%、聚酯纤维掺量0.4%的沥青混合料，开展盐冻耦合作用（NaCl溶液质量分数为0%、7.0%、13.0%、26.5%，冻融循环次数为0、2、4、6、8）下的半圆弯曲（SCB）试验，分析了盐冻耦合作用对SCB试件内部损伤劣化过程的影响.结果表明：NaCl溶液质量分数为13.0%、冻融循环为8次时，盐冻耦合作用对沥青混合料的侵蚀破坏作用最强，试件内部损伤最严重；在煤矸石粉与矿粉质量比为1∶1、聚酯纤维掺量为0.4%的条件下，沥青混合料能够形成高黏性、致密、厚实的沥青膜以及由纤维形成的三维网状结构，从而显著降低盐冻侵蚀对沥青混合料的损伤.通过Poly2D模型对SCB试件的极限拉应力损伤量进行拟合，拟合系数为0.944. |
| 关键词: 半圆弯曲试验 质量变化 波速 盐冻损伤 Poly2D模型 扫描电镜 X射线衍射 |
| DOI：10.3969/j.issn.1007-9629.2022.05.011 |
| 分类号:U414 |
| 基金项目:安徽省高校自然科学重点研究项目（KJ2017A096）；安徽理工大学研究生创新基金资助项目（2020CX2035） |
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| Salt-Freezing Damage Performance of Coal Gangue Powder/Polyester Fiber Asphalt Mixture |
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WU Jinrong1,2, ZHANG Tao2, LI Fei2
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1.Engineering Research Center of Underground Mine Construction， Ministry of Education， Anhui University of;Science and Technology， Huainan 232001， China;2.School of Civil Engineering and Architecture，Anhui University of Science and Technology， Huainan 232001， China
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| Abstract: |
| The semi circle bending （SCB） test of coupling effect of salt-freezing cycle （the concentration of NaCl is 0%， 7.0%， 13.0%， 26.5%， and the number of freeze-thaw cycles is 0， 2， 4， 6， 8） was carried out with 50% replacement rate of coal gangue powder and 0.4% polyester fiber content， the influence of salt freeze-thaw cycle on the internal damage and deterioration process of the specimen is studied. The results show that when the concentration of NaCl solution is 13.0% and the freeze-thaw cycles are 8 times， the salt-freezing coupling action has the strongest erosion and damage effect on asphalt mixture， and the internal damage of the specimen is the most serious； when the mass ratio of coal gangue powder to mineral powder is 1∶1 and the content of polyester fiber is 0.4%， asphalt mixture can have high viscosity， becoming dense and thick asphalt film and three-dimensional network structure formed by fiber， which can well alleviate and reduce the damage of salt freezing erosion to asphalt mixture. The ultimate tensile stress damage is fitted by Poly2D model， and the fitting coefficient is 0.944. |
| Key words: semi circle bending （SCB） test mass change wave velocity salt-freezing damage Poly2D model SEM XRD |
