聚氨酯涂层加固混凝土梁的力学性能研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (1): 134-140.

所属专题：水泥混凝土

聚氨酯涂层加固混凝土梁的力学性能研究

雷波¹, 黄显彬²

1.广安职业技术学院土木工程学院,广安 638000;
2.四川农业大学土木工程学院,都江堰 611800

收稿日期:2021-09-27 修订日期:2021-10-29 出版日期:2022-01-15 发布日期:2022-02-10
作者简介:雷波(1986—),男,副教授。主要从事建筑材料、钢结构、建筑施工、结构设计的研究。E-mail:leibo198608@163.com
基金资助:
国家自然科学基金(51908386);广安市科技局2019年市级科技创新重点基础研究项目(19)

Mechanical Properties of Polyurethane Coated Reinforced Concrete Beams

LEI Bo¹, HUANG Xianbin²

1. School of Civil Engineering, Guang'an Vocational & Technical College, Guang'an 638000, China;
2. School of Civil Engineering, Sichuan Agricultural University, Dujiangyan 611800, China

Received:2021-09-27 Revised:2021-10-29 Online:2022-01-15 Published:2022-02-10

摘要/Abstract

摘要： 通过对混凝土试件进行试验研究,在应变率为0.000 3 s^-1和0.065 s^-1的加载条件下进行三点弯曲试验,模拟静态荷载和冲击荷载,评估聚氨酯(PU)涂层在静态荷载和冲击荷载作用下增强混凝土试件力学响应的有效性。结果表明,PU涂层(在混凝土试件的正面或反面)的应用对提高混凝土结构的延性具有积极作用,最大应变和累积应变能随着PU涂层厚度的增加近似线性增加,反面涂覆的方法在静态荷载作用下对混凝土结构的加固效率更高,采用正面涂覆的方法可增强混凝土结构的抗冲击性,通过增加涂层厚度能有效提高加固能力。PU涂层在试件的最终破坏过程中不会脱胶,这意味着材料具有良好的附着力,能有效减弱试件的破碎效应。

关键词: 聚氨酯, 混凝土梁, 涂覆厚度, 动态加载, 三点弯曲, 裂纹模式

Abstract: Experimental investigation was conducted using concrete specimens to assess the effectiveness of polyurethane (PU) coating in enhancing the mechanical response of concrete specimens under static and impact loads. Three point bending tests were carried out at strain rates of 0.000 3 s^-1 and 0.065 s^-1 to simulate static and impact loads. The results show that the application of PU coating (on the front or reverse of concrete specimens) has a positive effect on improving the ductility of concrete structure. The maximum strain and cumulative strain energy increase linearly with the increase of PU coating thickness. The method of reverse coating is more efficient in strengthening concrete structure under static load, and the method of front coating enhances the impact resistance of concrete structure. The strengthening ability is effectively improved by the increase of coating thickness. PU coating does not debond during the ultimate failure of test specimens, which implies that the material has good adhesion characteristics and effectively reduces the crushing effect of specimens.

Key words: polyurethane, concrete beam, coating thickness, dynamic loading, three point bending, fracturing mode

中图分类号:

TU528

雷波, 黄显彬. 聚氨酯涂层加固混凝土梁的力学性能研究[J]. 硅酸盐通报, 2022, 41(1): 134-140.

LEI Bo, HUANG Xianbin. Mechanical Properties of Polyurethane Coated Reinforced Concrete Beams[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(1): 134-140.

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聚氨酯涂层加固混凝土梁的力学性能研究

Mechanical Properties of Polyurethane Coated Reinforced Concrete Beams

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