| 摘要: |
| 采用“逐级填充”方法进行骨架嵌挤密实型级配设计，以“等体积替换”为主导，用定量胶粉等体积替换对应尺寸集料，进行干法橡胶改性沥青混合料配合比设计体系的研究.结果表明：影响干法橡胶改性沥青混合料抗飞散性能的因素依次为：级配>油石比增量>粗胶粉掺量；对于胶粉体积分数为5.0%的干法橡胶改性沥青混合料，当采用SIDG级配，粒径为4.75~9.5mm的粗胶粉掺量不超过胶粉总质量的50%，且油石比在原级配基础上增加0.3%时，混合料抗飞散性能最佳；当胶粉体积分数为3.0%时，混合料动稳定度有显著提高，但随着胶粉体积分数的继续增加，动稳定度呈下降趋势. |
| 关键词: 废胎胶粉 干法 沥青混合料 配合比设计 等体积替换 肯塔堡飞散试验 |
| DOI：103969/j.issn1007 9629201401018 |
| 分类号: |
| 基金项目:重庆交通大学交通土建工程材料国家地方联合工程实验室开放基金资助项目（LHSYS 2012 006） |
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| Research on the Mix Design of Dry Process CrumbRubber Modified Asphalt Mixture |
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YU Miao, WU Guoxiong
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National and Regional United Engineering Lab for Communications Construction Materials,Chongqing Jiaotong University, Chongqing 400074, China
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| Abstract: |
| “Filling in gradation”method has been adopted in the skeleton interlocking dense gradation design with “equi volume replacement”method as the guiding idea for solving the problem of inadequacy of conventional gradation design methodologys direct application in the design of dry process crumb rubber modified asphalt mixture. The research on the mix design system for dry process crumb rubber modified asphalt mixture was carried out adopting the method of replacement of equi volume aggregates with quantified crumb rubbers. The results demonstrate that the gradation has the most predominant effect on the mass loss in Cantabro test compared with the asphalt aggregate ratio, and the crumb rubber content affects least in the three factors. The results indicate that with the skeleton interlocking dense gradation and no more than 50% of the coarse rubber, the asphalt aggregate ratio increased by 0.3% on top of the original gradation, the good performance of the dry process crumb rubber modified asphalt mixture with 5.0% rubber content by the aggregate in volume can be achieved in Cantabro test. In addition, the dynamic stability can be improved distinctly when the rubber content accounts for 3.0% in volume, but then reduced with the continuous increase of rubber content. |
| Key words: waste crumb rubber dry process asphalt mixture mix design equi volume replacement Cantabro test |
