| 摘要: |
| 对胶粉改性沥青混合料进行融雪盐条件下的冻融循环试验，随后测试其空隙率、劈裂强度以及马歇尔模数，分析冰冻温度、融雪盐浓度和冻融循环次数对混合料空隙率、劈裂强度以及马歇尔模数的影响，同时对融雪盐条件下冻融循环后混合料的微观形貌进行观察，探讨融雪盐条件下冻融循环后混合料水稳定性能的劣化机理.结果表明：冰冻温度、融雪盐浓度和冻融循环次数都会对胶粉改性沥青混合料的空隙率、劈裂强度和马歇尔模数产生较大的影响；融雪盐晶粒对沥青黏结性的破坏以及冰晶在混合料内部的膨胀和消融是造成混合料水稳定性能下降的关键原因. |
| 关键词: 沥青混合料 正交试验 冻融 空隙率 劈裂强度 马歇尔模数 |
| DOI：103969/jissn1007 9629201405012 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（11162010） |
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| Water Stability of Rubber Modified Asphalt Mixture under Salt Freeze Cycle |
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FENG Lei, CUI Yanan, LI Chao
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School of Civil Engineering, Inner Mongolia University of Technology, Huhhot 010051, China
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| Abstract: |
| Freeze thaw cycle test for rubber modified asphalt mixture was conducted under the condition of deicing salt, then its void ratio, splitting strength and Marshall modulus were determined. The influences of freezing temperature, deicing salt concentration and number of freeze thaw cycles on the void ratio, splitting strength and Marshall modulus were investigated, at the same time the degradation mechanism of mixture after freeze thaw cycle was analyzed by observing its microstructure under the deicing salt conditions. The results show that freezing temperature, deicing salt concentration and number of freeze thaw cycles would produce a greater influence on the void ratio, splitting strength and Marshall modulus of rubber modified asphalt mixture. The key reason for the decline of water stability of mixture is the damage of deicing salt grain on the cohesiveness of asphalt and the expansion and ablation of ice mixture inside. |
| Key words: asphalt mixture orthogonal test freeze thaw void ratio splitting strength Marshall modulus |
