| 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. |
| 关键词: 车桥耦合振动 磷酸镁水泥 钢纤维 界面黏结性能 孔结构 |
| DOI：10.3969/j.issn.1007-9629.2022.04.004 |
| 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） |
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| Effect of Vehicle-Bridge Coupled Vibration on Interface Bond Performance between Steel Fiber and Magnesium Phosphate Cement Mortar |
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GAO Guoqi1,2, CHEN Dazhang3, WANG Shunfeng1,2, LIU Sijia1,2, YANG Zhenghong1,2
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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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| 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. |
| Key words: vehicle-bridge coupled vibration magnesium phosphate cement steel fiber interface bond performance pore structure |
