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| 逐级递进射流冲击破碎废弃混凝土分离骨料可行性试验 |
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汤积仁1,2,姚奇1,2,章文峰3,卢义玉1,2,张洋凯1,2,汪壘1,2
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(1.重庆大学煤矿灾害动力学与控制国家重点实验室,重庆 400044;2.重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室, 重庆 400044;3.重庆渝湘复线高速公路有限公司,重庆 408500)
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| 摘要: |
| 基于砂浆与骨料不同抗冲击特性,提出逐级递进射流冲击破碎废弃混凝土分离骨料方法,通过开展废弃混凝土分离骨料实验及再生骨料性能测试试验,对该方法的可行性和可靠性进行验证。结果表明:逐级递进射流冲击破碎废弃混凝土分离骨料方法能高效分离骨料与砂浆；与机械破碎法相比该方法制备的再生骨料残余砂浆含量显著下降(降低约80%),表观密度略有增加(增加约5%),吸水率显著降低(降低约75%)；制备的再生骨料表观密度及吸水率都达到再生骨料国家I类标准。 |
| 关键词: 扇形射流 废弃混凝土 再生骨料 残余砂浆 |
| DOI：10.3969/j.issn.1673-5005.2022.02.012 |
| 分类号::TU 528.041 |
| 文献标识码:A |
| 基金项目:国家杰出青年科学基金项目(51625401)；长江学者和创新团队发展计划项目(IRT17R112)；重庆市自然科学基金项目(cstc2019jcyj-bshX0025) |
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| Experiment on feasibility of separating aggregate from waste concrete by progressive jet impingement |
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TANG Jiren1,2, YAO Qi1,2, ZHANG Wenfeng3, LU Yiyu1,2, ZHANG Yangkai1,2, WANG Lei1,2
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(1.State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China;2.National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing 400044, China;3.Project of Double Track of Chongqing-Yuxiang Expressway, Chongqing 408500, China)
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| Abstract: |
| On the basis of the different impact resistance characteristics of mortar matrix and mortar, a method of separating the aggregate of waste concrete impacting by progressive jet was proposed. The feasibility and reliability of the method were verified by carrying out waste concrete aggregate separation experiment and recycled aggregate performance test. The results show that the aggregate separation method of progressive jet impact crushing waste concrete can effectively separate aggregate and mortar. Compared with the mechanical crushing method, the residual mortar content of recycled aggregate prepared by this method is significantly reduced by about 80%, the apparent density is slightly increased by about 5%, and the water absorption rate is significantly reduced by 75%. The apparent density and water absorption rate of the recycled aggregate prepared by this method meet the national level I standard of recycled aggregate. |
| Key words: fan-shaped jet waste concrete recycled aggregate (RA) residual mortar |
