CO2强化再生骨料的表征及其环境效益评价
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1.绍兴文理学院;2.同济大学;3.浙江省岩石力学与地质灾害重点实验室

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国家自然科学中巴联合基金 (51661145023);浙江省自然科学基金项目(LY20E080012);绍兴市科技计划创新项目(2018C30007)


Characterization and environmental benefit assessment of CO2-modified recycled aggregates
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Affiliation:

1.Shaoxing University;2.SHAOXINGUNIVERSITY;3.Tongji University;4.Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province

Fund Project:

Joint research project between Natural Science Foundation of China and Pakistan Science Foundation (No. 51661145023);Natural Science Foundation of Zhejiang Province (No. LY20E080012); Science and Technology Innovation Project of Shaoxing (No. 2018C30007)

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    摘要:

    CO2强化不同品质和粒径再生骨料的表征并不系统和完善。本文在约20%CO2浓度和自然环境压力下,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,综合评价了CO2强化再生骨料的环境效益。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气体越多;CO2强化再生骨料显著降低其吸水率,明显提升CO2强化再生骨料混凝土的强度和抗氯离子渗透性能。CO2强化再生骨料既可吸收CO2气体,又可因CO2强化再生骨料混凝土性能提升而减少材料用量所致CO2排放减小,具有良好的环境效益。

    Abstract:

    The characterization of CO2-modified recycled aggregates with different qualities and particle sizes is not systematic and comprehensive. Under 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 in CRCA were investigated; the compressive strength and chloride penetration resistance of CO2-modified recycled coarse aggregate concrete (CRAC) were also evaluated; finally, its environmental benefits were assessed. 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. The CO2 modification of recycled aggregate captures CO2, and reduces the construction material usage due to the enhanced properties of CRAC, which brings better environmental benefits.

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  • 收稿日期:2020-06-01
  • 最后修改日期:2020-06-12
  • 录用日期:2020-09-25
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