盐-干湿循环耦合侵蚀下玄武岩纤维再生混凝土耐久性评价及寿命预测
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东华理工大学土木与建筑工程学院

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TU375

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国家自然科学基金(51178361);国家自然科学基金(52368012);江西省自然科学基金(20232BAB204066);江西省重点研发计划(20202BBG 73037);江西省自然科学基金(20181BAB216027);江西省教育厅科技项目(GJJ170486);江西省交通运输厅科技项目(2017C0002)第一作者:杨文瑞(1986—),女,汉族,江西南昌人,博士,副教授。研究方向:主要从事新型材料应用与结构耐久性研究。E-mail:wryang99@163.com。 ,黄跃文1 ,刘利爱1 ,周海1 ,张勋1 ,李成炜1 ,熊小龙1 ,钟勖文1


Durability Evaluation and Life Prediction of Basalt Fiber Recycled Concrete under Salt-Dry-Wet Cycle Coupling Erosion
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School of Civil and Architectural Engineering,East China University of Technology

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    摘要:

    为了研究盐溶液侵蚀下玄武岩纤维对再生混凝耐久性能的影响,本文开展了不同玄武岩纤维掺量下再生混凝土试块在受到盐-干湿循环耦合侵蚀后耐久性能变化规律研究。基于熵权法建立了综合耐久性指标D值来评价再生混凝土耐久性能,分析了盐溶液干湿循环周期和玄武岩纤维掺量对D值的影响,并构建了GM(1,1)均值模型,用以揭示再生混凝土D值的时变规律,得到了不同条件下再生混凝土的预测寿命。结果表明:D值可以反映出不同盐溶液干湿循环周期及玄武岩纤维掺量对再生混凝土耐久性能影响规律。随着盐溶液干湿循环周期的增加,试件D值呈现出逐渐下降的趋势,且变化趋于剧烈,表现为D值下降速率逐渐增大;玄武岩纤维的掺入可以有效提高再生混凝土D值,改善再生混凝土的耐久性能;玄武岩纤维掺量为1.0%时,耐久性能改善效果最佳;在数据量较少时, GM(1,1)模型可以较为精确地预测再生混凝土在盐-干湿循环耦合侵蚀下D值的时变规律。

    Abstract:

    In order to study the effect of basalt fiber on the durability of recycled concrete under the erosion of salt solution, this paper carries out a study on the change rule of the durability of recycled concrete specimens under different basalt fiber content after being subjected to salt-dry-wet cycle coupled erosion. Based on the entropy weight method, the comprehensive durability index D value was established to evaluate the durability of recycled concrete, and the effects of salt solution dry-wet cycle cycles and basalt fiber content on D value were analyzed. Finally, the GM(1,1) mean value model was constructed to reveal the time-varying law of the D value of recycled concrete, and the predicted life of recycled concrete under different conditions was obtained. The results show that the D value can reflect the influence of different salt solution dry-wet cycle cycles and basalt fiber content on the durability of recycled concrete. As the salt solution's dry-wet cycle increased, the D value of the specimen gradually decreased, indicating a severe change. However, adding basalt fiber to the recycled concrete can effectively enhance its D value and durability. When the content of basalt fiber is 1.0 %, the durability of recycled concrete is the best. The GM(1,1) model can more accurately predict the time-varying pattern of D values of recycled concrete under coupled salt-dry-wet cycle erosion when the amount of data is small.

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黄跃文,杨文瑞,刘利爱,等. 盐-干湿循环耦合侵蚀下玄武岩纤维再生混凝土耐久性评价及寿命预测[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-10-19
  • 最后修改日期:2024-05-20
  • 录用日期:2024-05-21
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