| 摘要: |
| 提出了一种再生建筑废弃物的高效利用方法，并以此制备了生态型超高性能混凝土（UHPC）.基于改进的颗粒堆积模型（MAA模型），开发了最大粒径为4.75 mm的碳化再生粗骨料（CRCA）超高性能混凝土（CRCA-UHPC），评估了CRCA对UHPC 宏观性能及纳微观结构的影响.结果表明：将CRCA掺入 UHPC中可以改善UHPC的力学性能和耐久性能，降低UHPC的自收缩，优化骨料与基体间的界面过渡区（ITZ）. |
| 关键词: 再生粗骨料 超高性能混凝土 清洁建筑材料 碳化再生粗骨料 |
| DOI：10.3969/j.issn.1007-9629.2022.11.011 |
| 分类号:TU525 |
| 基金项目:国家自然科学基金资助项目（52178249） |
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| Preparation of Environmentally Friendly UHPC Containing Carbonized Recycled Coarse Aggregate |
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LENG Yong1,2, YU Rui1, FAN Dingqiang1,2, ZHANG Xueyu1,2
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1.State Key Laboratory of Silicate Materials for Architectures， Wuhan University of Technology， Wuhan 430070， China;2.School of Materials Science and Engineering， Wuhan University of Technology， Wuhan 430070， China
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| Abstract: |
| An efficient utilization method of recycled construction waste， and a method for preparing ecological ultra-high performance concrete were proposed. First， based on the improved particle packing model MAA model， carbonized recycled coarse aggregate ultra-high performance concrete （CRCA-UHPC） with a maximum particle size of 4.75 mm was developed. Then， the effect of the introduction of CRCA on the macroscopic properties as well as the nano-microstructure of UHPC was evaluated. The results show that by the introduction of CRCA into UHPC， the mechanical properties and durability of UHPC are improved， the autogenous shrinkage of UHPC is reduced， and the interface transition zone （ITZ） between the aggregate and the matrix is optimized. |
| Key words: recycled coarse aggregate （RCA） ultra-high performance concrete （UHPC） clean building material carbonized recycled coarse aggregate （CRCA） |
