长江科学院院报 ›› 2019, Vol. 36 ›› Issue (9): 142-145.DOI: 10.11988/ckyyb.20180901

• 水工结构与材料 • 上一篇    下一篇

粉煤灰对再生混凝土抗碳化性能的影响

董伟1,苏英1,林艳杰2,肖阳1   

  1. 1.内蒙古科技大学 土木工程学院,内蒙古 包头 014010;
    2.内蒙古科技大学 基建处,内蒙古 包头 014010
  • 收稿日期:2018-08-22 修回日期:2018-10-09 出版日期:2019-09-01 发布日期:2019-09-12
  • 作者简介:董 伟(1987-),男,内蒙古包头人,讲师,博士,主要从事混凝土耐久性方面的研究。E-mail:dw617@126.com
  • 基金资助:
    内蒙古自治区自然科学基金项目(2017BS0505)

Effect of Fly Ash on Recycled Concrete’s Resistance to Carbonization

DONG Wei1, SU Ying1, LIN Yan-jie2, XIAO Yang1   

  1. 1.School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China;
    2.Infrastructure Construction Department, Inner Mongolia University of Science and Technology, Baotou 014010, China
  • Received:2018-08-22 Revised:2018-10-09 Online:2019-09-01 Published:2019-09-12

摘要: 粉煤灰再生混凝土符合“十三五”规划绿色发展理念,粉煤灰及再生骨料等废弃物的有效利用具有重大的经济意义和环保意义。试验设计了不同粉煤灰掺量(0%,15%,25%,35%,45%)的再生混凝土,研究粉煤灰再生混凝土的碳化规律,并建立碳化预测模型。结果表明:混凝土的碳化深度与碳化时间及粉煤灰掺量呈正比关系;CO2扩散系数与粉煤灰掺量呈线性函数关系。建立了基于CO2扩散系数的碳化深度预测模型,模型的建立为粉煤灰再生混凝土的应用提供了重要支撑。

关键词: 再生混凝土, 粉煤灰掺量, 碳化深度, 预测模型, CO2扩散系数

Abstract: Adding fly ash in recycled concrete accords with the concept of “The 13th Five-Year Green Development Plan”. The reasonable use of fly ash and recycled aggregate wastes is of great significance for economy and environment. In this research, we designed recycled concrete specimens dosed with different content of fly ash (0%, 15%, 25%, 35% and 45%) to investigate the rule of carbonization of recycled concrete mixed with fly ash. Results demonstrate that the carbonization depth of concrete is in positive relation with carbonizing age and fly ash content; the coefficient of CO2 diffusion is in a linear functional relation with fly ash content. Moreover, we built a prediction model for carbonization depth based on the coefficient of CO2 diffusion.

Key words: recycled concrete, fly ash dosage, carbonization depth, prediction model, coefficient of CO2 diffusion

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