盐-冻侵蚀环境下聚丙烯纤维混凝土的寿命预测

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (6): 2111-2120.

盐-冻侵蚀环境下聚丙烯纤维混凝土的寿命预测

徐存东^1,2,3, 汪志航^1,2, 陈家豪^1,2, 李准^1,2, 王海若^1,2, 徐慧^1,2

1.华北水利水电大学水利学院,郑州 450046;
2.浙江省农村水利水电资源配置与调控关键技术重点实验室,杭州 310018;
3.河南省水工结构安全工程技术研究中心,郑州 450046

收稿日期:2023-11-20 修订日期:2024-03-15 出版日期:2024-06-15 发布日期:2024-06-18
通信作者: 汪志航,硕士研究生。E-mail:1241517058@qq.com
作者简介:徐存东(1972—),男,博士,教授。主要从事水工结构优化设计和耐久性的研究。E-mail:xcundong@126.com
基金资助:
宁夏回族自治区水利科技项目(QTXGQ-KY-2023-001);甘肃省水利科技计划项目(22GSLK019)

Life Prediction of Polypropylene Fiber Reinforced Concrete under Salt-Freeze Erosion Environment

XU Cundong^1,2,3, WANG Zhihang^1,2, CHEN Jiahao^1,2, LI Zhun^1,2, WANG Hairuo^1,2, XU Hui^1,2

1. School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, China;
2. Key Laboratory for Technology in Rural Water Management of Zhejiang Provincial, Hangzhou 310018, China;
3. Henan Provincial Hydraulic Structure Safety Engineering Research Center, Zhengzhou 450046, China

Received:2023-11-20 Revised:2024-03-15 Online:2024-06-15 Published:2024-06-18

摘要/Abstract

摘要： 针对我国西北地区混凝土结构在盐-冻侵蚀下耐久性降低的问题,本研究选取不同聚丙烯纤维掺量(0、0.6、0.9、1.2、1.5 kg·m^-3)的混凝土试件,将其分别放入清水、3%NaCl、5%Na₂SO₄溶液中进行冻融循环试验,分析试件质量损失率、动弹性模量和抗压强度的变化规律,并基于Weibull理论和灰色预测理论分别建立标准模型,对聚丙烯纤维混凝土结构的最大服役年限进行预测,同时结合SEM分析聚丙烯纤维对混凝土的作用机理。结果表明:清水冻融工况对混凝土造成的损伤要低于盐冻侵蚀,其中氯盐对混凝土的力学性能侵蚀破坏最为严重;聚丙烯纤维的渗入可以有效减缓冻融侵蚀作用下混凝土力学性能的衰减速率,削弱因外界侵蚀对抗压强度等带来的影响。当纤维掺量达到1.2 kg·m^-3时效果最优,灰色预测模型和Weibull两种模型的寿命预测结果大致相似,其中灰色预测模型只能根据现阶段所含有的数据进行大范围的推断,而Weibull模型预测结果较为精确。该结果可为混凝土的力学性能研究和选择较佳的模型预测混凝土服役寿命提供一定的理论指导和依据。

关键词: 混凝土, 聚丙烯纤维, Weibull模型, 灰色预测模型, 耐久性, 寿命预测

Abstract: In response to the problem of reduced durability of concrete structures in the northwest region of China under salt frost erosion, this study selected concrete specimens with different polypropylene fiber contents (0, 0.6, 0.9, 1.2, 1.5 kg·m^-3) and placed them in clear water, 3%NaCl, and 5%Na₂SO₄ solutions for freeze-thaw cycle testing. The changes in mass loss rate, dynamic elastic modulus and compressive strength of specimens were analyzed, and standard models were established based on Weibull theory and grey theory to predict the maximum service life of polypropylene fiber reinforced concrete structures. At the same time, SEM was used to analyze the mechanism of polypropylene fiber reinforced concrete. The results show that the damage caused by clear water freeze-thaw conditions to concrete is lower than that caused by salt freeze-thaw erosion, with chloride salt causing the most severe erosion damage to mechanical properties of concrete. The infiltration of polypropylene fibers can effectively slow down the degradation rate of mechanical properties of concrete under freeze-thaw erosion and weaken the impact of external erosion on compressive strength. The optimal effect is achieved when the fiber content reaches 1.2 kg·m^-3. The life prediction results of grey prediction model and Weibull model are roughly similar. The grey prediction model can only make large-scale inferences based on data currently contained, while Weibull model has more accurate prediction results. This result can provide theoretical guidance and basis for studying the mechanical properties of concrete and selecting the best model to predict the service life of concrete.

Key words: concrete, polypropylene fiber, Weibull model, grey prediction model, durability, life prediction

中图分类号:

TU528.572

徐存东, 汪志航, 陈家豪, 李准, 王海若, 徐慧. 盐-冻侵蚀环境下聚丙烯纤维混凝土的寿命预测[J]. 硅酸盐通报, 2024, 43(6): 2111-2120.

XU Cundong, WANG Zhihang, CHEN Jiahao, LI Zhun, WANG Hairuo, XU Hui. Life Prediction of Polypropylene Fiber Reinforced Concrete under Salt-Freeze Erosion Environment[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(6): 2111-2120.

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