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首页 > 过刊浏览>2022年第25卷第4期 >353-359. DOI:10.3969/j.issn.1007-9629.2022.04.004
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车桥耦合振动对钢纤维与磷酸镁水泥砂浆界面黏结性能的影响
作者:
作者单位:

1.同济大学 先进土木工程材料教育部重点实验室，上海 201804;2.同济大学 材料科学与工程 学院，上海 201804;3.广东省高速公路有限公司，广东 广州 510180

作者简介:

高国旗（1997—），男，山西吕梁人，同济大学硕士生. E-mail： gguqoi@126.com

通讯作者:

杨正宏（1967—），男，安徽六安人，同济大学教授，博士生导师，博士. E-mail： tjzhy92037@163.com

中图分类号:

TU528.572

基金项目:

广东省高速公路有限公司科研项目（MZKJ-SY-001）


Effect of Vehicle-Bridge Coupled Vibration on Interface Bond Performance between Steel Fiber and Magnesium Phosphate Cement Mortar
Author:
Affiliation:

1.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education， Tongji University， Shanghai 201804， China;2.School of Materials Science and Engineering， Tongji University， Shanghai 201804， China;3.Guangdong Provincial Highway Co.， Ltd.， Guangzhou 510180， China

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    摘要:

    制备了一种超早强型纤维增强磷酸镁水泥（MPC），通过对纤维拔出性能及孔结构的研究，系统地分析了车桥耦合振动的振幅和频率对钢纤维与MPC砂浆之间界面黏结性能及微观结构的影响.结果表明：钢纤维与MPC砂浆的黏结性能随着振幅、频率的增加呈现先增大后减小的趋势；与静置条件下相比，振幅为2、3 mm，频率为3、6 Hz时，钢纤维与MPC砂浆的最大黏结强度和拉拔能提升最大；一定程度振动可以降低MPC砂浆的孔隙率，细化宏观孔，优化钢纤维与MPC砂浆的界面黏结性能.

    Abstract:

    An ultra-early-strength fiber-reinforced magnesium phosphate cement（MPC）was prepared. The influence of the amplitude and frequency of vehicle-bridge coupling vibration on the interface performance and microstructure between steel fiber and MPC was systematically analyzed through the study of fiber pullout performance and pore structure. The results show that the bond performance between steel fiber and MPC based materials increases at first and then decreases with the increase of amplitude and frequency. Compared with the static condition， when the amplitude is 2， 3 mm and the frequency is 3， 6 Hz， the maximum bond strength and pullout energy between steel fiber and MPC mortar increase maximumly. Under a certain degree of vibration， the porosity of MPC mortar can be reduced， the macroscopic pores can be refined， and the interface bond performance between steel fiber and MPC mortar can be optimized.

    表 1 磷酸镁水泥的化学组成Table 1 Chemical composition of MPC
    表 2 钢纤维物理力学性能Table 2 Physical and mechanical properties of steel fibers
    表 3 车桥耦合振动参数Table 3 Vehicle-bridge vibration parameters
    图1 不同振幅下钢纤维的拉拔荷载-滑移曲线Fig.1 Pullout load-slip curves of steel fibers under different amplitudes
    图2 不同振幅下钢纤维的拉拔能Fig.2 Pullout energy of steel fibers under different amplitudes
    图3 不同频率下钢纤维的拉拔荷载-滑移曲线Fig.3 Pullout load-slip curves of steel fibers under different frequencies
    图4 不同频率下钢纤维的拉拔能Fig.4 Pullout energy of steel fibers under different frequencies
    图5 “8”字形试件MPC砂浆的孔径分布和总孔隙率Fig.5 Pore size distribution and total porosity of “8” shaped MPC mortar specimens
    图6 “8”字形试件MPC砂浆的孔体积分数Fig.6 Pore volume fraction of “8” shaped MPC mortar specimens
    图7 f0-A0组试件中2种钢纤维拔出后的表面形貌Fig.7 Surface morphology of steel fibers in f0-A0 group after pulling out
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高国旗,陈达章,王顺风,刘思佳,杨正宏.车桥耦合振动对钢纤维与磷酸镁水泥砂浆界面黏结性能的影响[J].建筑材料学报,2022,25(4):353-359

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  • 收稿日期:2020-12-27
  • 最后修改日期:2021-02-21
  • 在线发布日期: 2024-01-28
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