基于GM11-Markov模型盐雾侵蚀对纤维混凝土耐久性能的影响
作者:
作者单位:

1.兰州理工大学 土木工程学院,甘肃 兰州 730050;2.兰州理工大学 西部土木工程防灾减灾教育部工程研究中心, 甘肃 兰州 730050

作者简介:

于剑桥(1995—),男,河北围场人,兰州理工大学硕士生.E-mail: 1815200102@e.gzhu.edu.cn

通讯作者:

乔宏霞(1977—),女,山西应县人,兰州理工大学教授,博士生导师,博士.E-mail: qiaohx7706@163.com

中图分类号:

TU528.58

基金项目:

国家自然科学基金资助项目(51168031,51868044)


Effect of Salt Spray Corrosion on Durability Performance of Fiber Concrete Based on GM11-Markov Model
Author:
Affiliation:

1.School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China;2.Western Civil Engineering Disaster Prevention and Mitigation Engineering Research Center, Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China

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    摘要:

    以玄武岩-聚乙烯醇(PVA)纤维体积分数为变化参数,对纤维混凝土进行室内盐雾侵蚀加速试验,通过抗压耐蚀系数Kf、相对质量评价参数ξ1、相对动弹性模量评价参数ξ2以及扫描电镜(SEM)照片,分别从宏观、微观层面对纤维混凝土耐久性损伤劣化进行评价分析,并基于GM(1,1)-Markov模型对其寿命进行预测.结果表明:在盐雾环境下,纤维混凝土的Kf先上升后下降,ξ1波动性较大,ξ2可作为评价纤维混凝土损伤劣化的决定性因素;GM(1,1)-Markov模型与实测数据吻合较好,纤维混凝土的最佳玄武岩、PVA纤维体积分数分别为0.10%、0.05%,其在盐雾环境下的服役时间最长,达到680 d.

    Abstract:

    Taking the volume fraction of basalt-polycinyl alcohol(PVA) fiber as the variable parameter, the indoor salt spray accelerated corrosion test was carried out. The damage and deterioration was evaluated and analyzed from the macro and micro aspects through the compressive corrosion resistance coefficient Kf, relative quality evaluation parameter ξ1, relative dynamic elastic modulus evaluation parameter ξ2 and scanning electron microscope (SEM) images, and the life of the fiber concrete was predicted based on GM(1,1)-Markov model. The results show that the Kf of the fiber concrete increases first and then decreases in the salt spray environment, ξ1 fluctuates greatly, and ξ2 can be used as the decisive factor for evaluate the damage and deterioration of fiber concrete. The data based on GM(1,1)-Markov model agrees well with the test data. The optimum volume fraction of basalt and PVA fiber is 0.10% and 0.01% respectively. The specimen with the optimum volume fraction has the longest service time under the salt spray environment, reaching 680 d.

    表 3 纤维混凝土的纤维体积分数及抗压强度Table 3 Fiber volume fraction and compressive strength of fiber concretes
    表 1 胶凝材料化学组成Table 1 Chemical compositions of cementitiou materials
    图1 试验流程图Fig.1 Test flow chart
    图2 盐雾侵蚀作用下纤维混凝土抗压耐蚀系数Kf的经时变化曲线Fig.2 Time variation curves of Kf of fiber concretes under salt spray corrosion
    图3 盐雾侵蚀作用下纤维混凝土相对质量评价参数的经时变化曲线Fig.3 Time variation curves of ξ1 of fiber concretes under salt spray corrosion
    图4 盐雾侵蚀作用下纤维混凝土相对动弹性模量评价参数的经时变化曲线Fig.4 Time variation curves of ξ2 of fiber concretes under salt spray corrosion
    图5 盐雾侵蚀200 d后OPC和B0.10P0.05的SEM照片Fig.5 SEM images of OPC and B0.10P0.05 after salt spray corrosion for 200 d
    图6 B0.10P0.05的GM(1,1)、GM(1,1)-Markov模型拟合结果Fig.6 Model fitting results of GM(1,1) and GM(1,1)-Markov of B0.10P0.05
    图7 基于GM(1,1)-Markov模型预测混凝土的相对动弹性模量Fig.7 Prediction of Er of concrete based on GM (1,1) -Markov model
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于剑桥,乔宏霞,朱飞飞,王新科.基于GM11-Markov模型盐雾侵蚀对纤维混凝土耐久性能的影响[J].建筑材料学报,2022,25(9):910-916

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  • 收稿日期:2021-08-09
  • 最后修改日期:2021-11-10
  • 在线发布日期: 2022-09-30
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