| 摘要: |
| 采用钠水玻璃、有机硅树脂和硅烷偶联剂强化再生集料（RA），测试未强化和强化再生集料的压碎值、磨耗值、吸水率和黏附性，优选强化剂；采用扫描电镜观察未强化和强化再生集料的表面微观形貌，探讨强化剂强化再生集料的机理；采用再生粗集料和天然细集料配制沥青稳定再生集料（ATRA），然后进行车辙试验、低温弯曲试验和水稳定性试验，测定沥青稳定再生集料的路用性能.结果表明：再生集料存在孔隙和微裂缝，致使其压碎值、磨耗值和吸水率较高，黏附性较低；有机硅树脂对再生集料综合性能强化效果优于硅烷偶联剂和钠水玻璃；有机硅树脂强化后再生集料的大部分孔隙被有效封堵，微裂缝得到一定程度上的修复，再生集料的抗压碎性能和黏附性提高，吸水性降低；当采用未强化再生粗集料时，沥青稳定再生集料的平均弯曲应变、残留稳定度和冻融劈裂强度比均不满足JTG F40—2004规范要求；当采用2%（质量分数）有机硅树脂强化再生粗集料时，沥青稳定再生集料的路用性能大幅提高，能满足JTG F40—2004规范的相关要求. |
| 关键词: 废弃水泥混凝土 再生集料 沥青稳定再生集料 SEM 强化 |
| DOI：103969/j.issn1007 9629201603029 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51408044)；中国博士后科学基金资助项目(2015T80999)；中央高校基本科研业务费专项资金资助项目(0009 2014G1211007) |
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| Experimental Research on Asphalt Treated Recycled Aggregate |
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ZHANG Yiluo1, GUO Qijie2, JI Xiaoping1
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1.Key Laboratory for Special Area Highway Engineering of Ministry of Education, Changan University, Xian 710064,China;2.Civil Aviation Engineering Consulting Company of China, Beijing 100621, China
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| Abstract: |
| The sodium silicate, organic silicone resin and silane coupling agent were used to enhance the performances of recycled aggregate(RA). The performances of RAs with and without enhancement were investigated, including crushing value, abrasion value, water absorption and adhesion in order to select out the best enhancer. The surface microscopic morphology of RAs with and without enhancement was observed by SEM and further the enhancing mechanism of enhancer on RA was investigated. The recycled coarse aggregate and natural fine aggregate were used to make up asphalt treated recycled aggregate(ATRA), and laboratory experiments were conducted including rutting test, water stability test and low temperature bending test, and then the road performances of ATRAs were investigated. The results show that RA has large crushing value, abrasion value and water absorption and poor adhesion due to the voids and micro cracks that exist in RA. The enhancing effect of organic silicone resin on comprehensive performances of RA is superior over that of sodium silicate and silane coupling agent. Most voids in RA are effectively blocked and micro cracks are repaired in a certain extent when RA is enhanced by organic silicone resin, and the anti crushed and adhesion of RA are improved and the water absorption of RA is reduced. When the RA without enhancement is used in ATRA, the average bending strain, residual stability and freeze thaw splitting strength ratio of ATRA cant meet the requirements of JTG F40—2004. Moreover, When the RA enhanced by 2%(by mass) organic silicone resin is used in ATRA, the road performances of ATRA can be greatly improved and meet regulatory requirements of JTG F40—2004. |
| Key words: demolished cement concrete recycled aggregate asphalt treated recycled aggregate(ATRA) SEM enhancement |
