| 摘要: |
| 研究了水泥、消石灰和消石灰矿渣粉3种外加材料对乳化沥青冷再生混合料路用性能的影响.采用扫描电镜观察了掺水泥乳化沥青冷再生混合料中新旧胶浆界面的显微结构，分析了外加材料对乳化沥青冷再生混合料强度的改善机理.结果表明：水泥对乳化沥青冷再生混合料的劈裂强度、高温稳定性、水稳性和疲劳寿命提高作用最大，消石灰矿渣粉次之，而消石灰最小.水泥或消石灰矿渣粉产生的水化产物与乳化沥青相互交织形成新胶浆，新胶浆劲度模量与严重老化的旧(沥青)胶浆劲度模量差别不大，同时水化产物能在新旧胶浆之间起“桥梁”作用，这促进了新旧胶浆之间的受力协调，大大改善了新旧胶浆之间的黏结，从而极大地提高了乳化沥青冷再生混合料的强度性能和路用性能. |
| 关键词: 冷再生 乳化沥青 水泥 路用性能 强度 机理 |
| DOI：10.3969/j.issn.1007 9629.2013.03.029 |
| 分类号: |
| 基金项目:国家国际科技合作项目（2010DFB83490 ）；上海市科技项目（10dz1200400）；“十一五”国家科技支撑计划项目（2010BAK69B16） |
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| Effect of Additives on Pavement Performance of Cold Recycled Asphalt Emulsion Mixture |
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DU Shao wen
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Key Laboratory for Special Region Highway Engineering of Ministry of Education, Changan University, Xian 710064, China
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| Abstract: |
| The effect of three types of additives, including cement(C), hydrated lime(L) and hydrated lime slag powder(LS) on the pavement performance of cold recycled asphalt emulsion mixture was investigated. Interface microstructure between new old mastics in cold recycled asphalt emulsion mixture with cement was observed by scan electron microscopy, and then the strength improvement mechanism of cold recycled asphalt emulsion mixture by additives was analyzed. The test results show that the addition of cement can improve the indirect tensile strength, rutting resistance, water resistance and fatigue life of cold recycled asphalt emulsion mixture best, followed by hydrated lime slag powder, hydrated lime is the last. The stiffness modulus of new mastic formed by hydrate products of cement or hydrated lime slag powder with asphalt emulsion is similar with that of old mastic(aged asphalt mastic). Hydrate products has the bridge effect between new old mastics, promoting the loading coordination and increasing the interface adhesive between new old mastics, thus， the strength and pavement performance of cold recycled asphalt emulsion mixture can be improved. |
| Key words: cold recycling asphalt emulsion cement pavement performance strength mechanism |
