| 摘要: |
| 采用高浓度CO2气体强化再生粗骨料（RCA）得到了CO2强化再生粗骨料（CRCA），通过试验测试了天然粗骨料（NCA）、RCA和CRCA的物理力学性能，并分别制备了NCA+RCA，NCA+CRCA，RCA+CRCA混凝土.结果表明：对于相同的级配，CRCA的表观密度、堆积密度、吸水率和压碎指标均介于RCA和NCA之间；用CRCA取代RCA配制混凝土可提高其抗压强度，且提高幅度随取代率（体积分数）的增加而增大；用CRCA取代NCA配制混凝土会降低其抗压强度，且降低幅度随取代率的增加而增大，但是，当取代率小于50%时，混凝土的抗压强度不会显著降低. |
| 关键词: 再生粗骨料 CO2强化 抗压强度 再生混凝土 |
| DOI：10.3969/j.issn.1007 9629.2017.02.021 |
| 分类号: |
| 基金项目:国家自然科学科学基金资助项目（51408138）；中国博士后科学基金资助项目；广西重点实验室系统性研究项目（2014ZDX07）；广西自然科学基金资助项目（2014GXNSFBA118251）；广西高校科学技术研究项目（YB2014022） |
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| Effect of CO2 Modified Recycled Aggregate on Compressive Strength of Concrete |
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YING Jingwei1, MENG Qiujiang1, XIAO Jianzhuang2
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1.College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;2.Department of Structural Engineering, Tongji University, Shanghai 200092, China
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| Abstract: |
| Carbonized recycled coarse aggregates（CRCAs） were obtained by recycled coarse aggregates（RCAs） modified under high concentration of CO2. The physical and mechanical properties of the natural coarse aggregate（NCA）， RCA and CRCA were experimentally investigated， and three types of concrete with different combinations of coarse aggregates， i.e.， NCA+RCA， NCA+CRCA， RCA+CRCA were designed and prepared， respectively. The results show that the apparent density， bulk density， water absorption and crushing index of CRCA are generally laid between those of RCA and NCA for the same coarse aggregate gradation. The concrete compressive strength increases with the increase of replacement of CRCA to RCA， whereas it decreases with the increase of replacement of CRCA to NCA. Also， the concrete compressive strength does not show obvious decrease when the replacement rate is smaller than 50%. |
| Key words: recycled coarse aggregates（RCA） CO2 modified compressive strength recycled aggregate concrete |
