| CO2强化再生骨料的特性及其对再生混凝土性能的影响 |
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| 引用本文： | 高越青,潘碧豪,梁超锋,肖建庄,何智海.CO2强化再生骨料的特性及其对再生混凝土性能的影响[J].土木与环境工程学报,2021,43(6):95-102. |
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| 作者姓名： | 高越青 潘碧豪 梁超锋 肖建庄 何智海 |
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| 作者单位： | 绍兴文理学院 土木工程学院, 浙江 绍兴 312000;绍兴文理学院 土木工程学院, 浙江 绍兴 312000;同济大学 土木工程学院, 上海 200092;绍兴文理学院 土木工程学院, 浙江 绍兴 312000;绍兴文理学院 浙江省岩石力学与地质灾害重点实验室, 浙江 绍兴 312000 |
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| 基金项目： | 国家自然科学中巴联合基金（51661145023）；浙江省自然科学基金（LY20E080012）；绍兴市科技计划创新项目（2018C30007） |
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| 摘 要： | CO2强化不同品质和粒径再生骨料的特性研究尚不系统和完善。在约20% CO2浓度和自然环境压力条件下，考虑再生粗骨料（RCA）品质和粒径的影响，试验测试了CO2强化再生骨料（CRCA）的碳化率、CO2吸收率、碱度、残留CO2气体含量、吸水率及CO2强化再生骨料混凝土（CRAC）的抗压强度和抗氯离子渗透性能。结果表明：CO2强化再生骨料的碳化率和CO2吸收率随再生骨料水灰比的增加而增加；CO2强化显著降低了再生骨料的碱度，且CO2强化再生骨料粒径越小、水灰比越低，其残留CO2气体含量越高；CO2强化显著降低了再生骨料的吸水率，明显提升CO2强化再生骨料混凝土的抗压强度和抗氯离子渗透性能。
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| 关 键 词： | 再生骨料 再生骨料混凝土 CO2强化 CO2吸收率 残留CO2 |
| 收稿时间： | 2020/6/1 0:00:00 |
Properties of CO2-modified recycled aggregates and its effect on the performance of recycled aggregate concrete |
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| GAO Yueqing,PAN Bihao,LIANG Chaofeng,XIAO Jianzhuang,HE Zhihai.Properties of CO2-modified recycled aggregates and its effect on the performance of recycled aggregate concrete[J].Journal of Civil and Environmental Engineering,2021,43(6):95-102. |
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| Authors: | GAO Yueqing PAN Bihao LIANG Chaofeng XIAO Jianzhuang HE Zhihai |
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| Affiliation: | School of Civil Engineering, Shaoxing University, Shaoxing 312000, Zhejiang, P. R. China;School of Civil Engineering, Shaoxing University, Shaoxing 312000, Zhejiang, P. R. China;College of Civil Engineering, Tongji University, Shanghai 200092, P. R. China; School of Civil Engineering, Shaoxing University, Shaoxing 312000, Zhejiang, P. R. China;Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, Shaoxing University, Shaoxing 312000, Zhejiang, P. R. China |
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| Abstract: | The properties of CO2-modified recycled aggregates with different qualities and particle sizes have not been investigated systematically and comprehensively. In the conditions of 20% CO2 concentration and natural environmental pressure, considering the effect of recycled coarse aggregate (RCA) quality and particle size, the carbonization rate, CO2 absorption, alkalinity, water absorption of CO2-modified recycled coarse aggregate (CRCA) and residual CO2 content in CRCA were investigated; the compressive strength and chloride penetration resistance of CO2-modified recycled coarse aggregate concrete (CRAC) were also evaluated. The results show that the carbonization rate and CO2 absorption of CRCA increase with the increase of CRCA water-cement ratio; the CO2 modification significantly reduces the alkalinity of RCA; the smaller particle size and lower water-cement ratio of CRCA, the more CO2 sequestrates in CRCA; the CO2 modification remarkably reduces the water absorption of CRCA and significantly improves the compressive strengths and chloride penetration resistance of CRAC. |
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| Keywords: | recycled aggregate recycled aggregate concrete CO2 modification CO2 absorption residual CO2 content |
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