| 摘要: |
| 为研究盐冻融循环作用下温拌工艺对胶粉改性沥青混合料（CR MA）低温抗裂性能的影响，以温拌胶粉改性沥青混合料（CR WMA）和热拌胶粉改性沥青混合料（CR HMA）为研究对象，在不同质量分数（0%，4%，8%，12%）的盐溶液和冻融循环次数（0，5，10，15，20次）条件下对小梁试件进行低温弯曲和弯曲蠕变试验，比较了2种CR MA弯曲应变能密度和弯曲蠕变速率等指标的衰减情况，并探讨了SDYK型表面活性类添加剂（掺量为基质沥青质量的06%）对CR MA低温性能的作用效果.结果表明：2种CR MA经盐冻融循环后，其弯曲应变能密度和弯曲蠕变速率均减小，低温抗开裂性能降低；随着盐冻融循环次数的增加，CR WMA各指标变化幅度均小于CR HMA，CR WMA的低温抗裂性能优于CR HMA；当除冰盐的质量分数为8%时，对CR MA的破坏最为严重. |
| 关键词: 冻融循环 除冰盐 胶粉改性沥青混合料 应变能密度 |
| DOI：103969/j.issn.1007 9629201903020 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（11762012）；内蒙古交通科技项目（NJ 2015 1） |
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| Low Temperature Properties of Warm Mixed Crumb Rubber Asphalt Mixture under Salt and Freeze Thaw Cycles |
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SHAN Mingyu, WANG Lan, ZHANG Baoxin
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School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
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| Abstract: |
| In order to study the effect of warm mixing technology on low temperature cracking resistance of the crumb rubber asphalt mixture(CR MA) under salt and freeze thaw cycles, the warm mixed crumb rubber asphalt mixture(CR WMA) and the hot mixed crumb rubber asphalt mixture(CR HMA) were used as the research object. The low temperature bending and bending creep tests of small beam asphalt mixture test piece under different salt mass fraction(0%, 4%, 8%, 12%) and freeze thaw cycles(0, 5, 10, 15,20times) were used to compare the attenuation of the low temperature property of two CR MA by the indicators of bending strain energy density and bending creep rate. The effect of CR MA low temperature performance was studied after adding SDYK surfactant type warm mix additive(the mass fraction was 06% of the matrix asphalt). The results show that bending strain energy density and bending creep rate of two CR MA all decrease after salt and freeze thaw cycles, and the low temperature cracking resistance reduces. With increasing the number of salt and freeze thaw cycles, the variation range of all indexes of CR WMA is smaller than that of CR HMA, which means the low temperature cracking resistance of CR WMA is better than CR HMA. When the deicing salt mass fraction is 8%, the damage of CR MA is the most serious. |
| Key words: freeze thaw cycle deicing salt crumb rubber asphalt mixture（CR MA） strain energy density |
