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Laboratory study on permanent deformation of foamed asphalt mix incorporating reclaimed asphalt pavement materials

机译：掺再生沥青路面材料的泡沫沥青混合料永久变形的室内试验研究

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For the purpose of investigating the effects of bitumen grade, content of reclaimed asphalt pavement (RAP) material and ageing of RAP, this paper presents the evaluation of permanent deformation of foamed asphalt (FA) mixes by using the dynamic creep test. The mix design of WC-20 was conducted based on the gradation requirement of FA mix and RAP aggregate size. Three parameters, creep strain slope (CSS), Intercept and secant creep stiffness modulus (SCSM), were used to analyze the test results. Mean comparison and multiple analysis of variance (MANOVA) reveal that bitumen grade significantly affects CSS, whilst content and ageing of RAP would have insignificant effect on CSS. High bitumen grade may help FA mixes on the reduction of susceptibility to permanent deformation. Test results reflect that variances of CSS, Intercept, and SCSM are large. There is a good exponential relationship between CSS and SCSM, however no correlation between CSS and air void is found. Comparison of test results between FA mixes and hot asphalt mixes exhibits that susceptibility and creep strength of FA mixes are better than those of selected hot asphalt mixes.
机译：为了研究沥青等级，再生沥青路面（RAP）材料的含量和RAP老化的影响，本文通过动态蠕变试验对泡沫沥青（FA）混合料的永久变形进行了评估。 WC-20的混合料设计是根据FA混合料的等级要求和RAP骨料尺寸进行的。使用三个参数蠕变应变斜率（CSS），截距和割线蠕变刚度模量（SCSM）来分析测试结果。均值比较和方差的多重分析（MANOVA）表明，沥青等级显着影响CSS，而RAP的含量和老化对CSS的影响不明显。高沥青等级可帮助FA混合料降低永久变形的敏感性。测试结果反映出CSS，Intercept和SCSM的差异很大。 CSS和SCSM之间存在良好的指数关系，但是CSS与气隙之间没有相关性。 FA混合料和热沥青混合料之间的测试结果比较表明，FA混合料的敏感性和蠕变强度优于所选的热沥青混合料。

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