寒区相变混凝土抗压强度与分形特性关联性分析
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1.甘肃省公路航空旅游投资集团有限公司规划发展部;2.中国科学院西北生态环境资源研究院

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TU526

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公航旅集团重点科技攻关项目(2021-A08)


Correlation Analysis of Compressive Strength and Fractal Characteristics in Cold Region Phase Change Concrete
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Planning and Development Department, Gansu Provincial Highway Aviation Tourism Investment Group CO.,LTD

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    摘要:

    利用相变材料和载体材料制备相变颗粒,替代混凝土骨料以制备相变混凝土是一种提升寒区混凝土耐久性的新型技术。为研究相变混凝土抗压强度与其孔隙特征之间的关联性,以正十四烷(n-tetradecane,C14)和膨胀珍珠岩(expanded perlite,EP)为原材料,制备一种水泥包封的新型相变颗粒(EPC14),随后等体积替换混凝土细骨料制备相变混凝土(phase change concrete,PCC-EPC14),对制备的相变混凝土开展50、100、150、200次冻融循环试验,然后采用单轴压缩试验与核磁共振试验测试相变混凝土的抗压强度与孔隙特征,最后利用分形理论计算相变混凝土的NMR(nuclear magnetic resonance)分形维数,分析抗压强度与NMR分形维数之间的关系。结果表明:相变颗粒与混凝土细骨料的最优体积替代比约为20%,此时,经历200次冻融循环后相变混凝土的NMR分形维数最大,孔隙度最小,抗压强度最大;此外,相变混凝土抗压强度与其NMR分形维数呈正比例关系,与弛豫时间信号面积呈反比例关系。

    Abstract:

    Utilizing phase change materials and carrier materials to prepare phase change particles, replacing concrete aggregates for the production of phase change concrete, represents a novel technique for enhancing the durability of concrete in cold regions. In order to investigate the correlation between the compressive strength of PCC and its pore characteristics, a novel type of phase change particles with cement-encapsulated, named EPC14, was prepared by using n-tetradecane (C14) and expanded perlite (EP) as raw materials. Subsequently, phase change concrete (PCC-EPC14) was prepared by replacing fine aggregates at an equal volume. The PCC-EPC14s underwent 50, 100, 150, and 200 freeze-thaw cycles. Then, uniaxial compression tests and nuclear magnetic resonance tests were uesd to test the compressive strength and pore characteristics of the PCC-EPC14s. Finally, the fractal dimension of the PCC-EPC14s was calculated using fractal theory, and the relationship between compressive strength and fractal dimension was analyzed. The results show that the optimal volume replacement ratio of phase change particles to fine aggregates is 20%. At this ratio, the PCC-EPC14 (20%) exhibites the maximum NMR (nuclear magnetic resonance) fractal dimension, minimum porosity, and maximum compressive strength after 200 freeze-thaw cycles. Additionally, a proportional relationship is observed between compressive strength and NMR fractal dimension, while an inverse relationship is found with relaxation time signal area.

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陶志金,董敏琪. 寒区相变混凝土抗压强度与分形特性关联性分析[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-04-21
  • 最后修改日期:2024-06-02
  • 录用日期:2024-06-05
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