| 橡胶沥青混合料RAC-G级配空隙率变化 |
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| 引用本文： | 黄明,郑茂,李彦伟,黄卫东.橡胶沥青混合料RAC-G级配空隙率变化[J].长沙理工大学学报(自然科学版),2012(1):23-28. |
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| 作者姓名： | 黄明 郑茂 李彦伟 黄卫东 |
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| 作者单位： | 同济大学道路与交通工程教育部重点实验室;四川省交通厅交通勘察设计研究院;河北省石家庄市交通运输局 |
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| 基金项目： | 国家自然科学基金资助项目(50308021) |
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| 摘 要： | 针对橡胶沥青专用级配之一的RAC-G，将其在不同级配情况下，通过马歇尔试验，重点考查了此级配中关键档集料掺量的变化对9．5mmRAC-G级配空隙率的影响规律,研究发现，为保证RAC-G级配空隙率在3％-6％的范围内，油石比应控制在8．5％-9．5％；油石比每增加0．5％，橡胶沥青混合料的空隙率减小0．9％-1．2％；在2．36-4．75mm的含量严格控制在12％以下的前提下，通过调整粗集料4．75-9．5mm与≤2．36mm集料的相对含量，可微调空隙率。相比ARAC级配，将9．5mmRAC-G级配应用于超薄罩面或应力吸收层，将具有更好的抗疲劳开裂和防反射裂缝的性能。
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| 关 键 词： | 空隙率 级配 RAC-G 橡胶沥青 油石比 |
Air void variation of asphalt rubber mixture grade RAC-G |
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| HUANG Ming,ZHENG Mao,LI Yan-wei,HUANG Wei-dong.Air void variation of asphalt rubber mixture grade RAC-G[J].Journal of Changsha University of Science and Technology:Natural Science,2012(1):23-28. |
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| Authors: | HUANG Ming ZHENG Mao LI Yan-wei HUANG Wei-dong |
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| Institution: | 1(1.Key Laboratory of Road and Traffic Engineering of the Ministry of Education,Tongji University,Shanghai 201804,China;2.Traffic Investigation and Design Institute of Sichuan Provincial Communications Department,Chengdu 610000,China; 3.Transportation Bureau of Shijiazhuang City,Hebei Province,Shijiazhuang 050051,China) |
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| Abstract: | RAC-G is one of the specific gradations of asphalt rubber.This study focused on the variation law of void ratio of 9.5 mm RAC-G caused by key size sieve pass rate changes through Marshall Tests.The results showed that oil-aggregate ratio should be controlled at 8.5%~9.5% to ensure RAC-G void ratio was within 3% to 6% range;when oil-aggregate ratio increased every 0.5%,void ratio of asphalt rubber mixture reduced by 0.9% to 1.2%.Under the premise that the content of 2.36~4.75 mm is strictly controlled below 12%,we can control void ratio by adjusting the relative content of the coarse aggregate(4.75~9.5 mm) and aggregate≤2.36 mm.Compared with ARAC,9.5 mm RAC-G graduation has a much better performance on resisting fatigue cracks and reflective cracks when applied to ultra-thin overlay or stress absorbing layer. |
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| Keywords: | void ratio gradation RAC-G asphalt rubber oil-aggregate ratio |
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