振动搅拌工作参数对混凝土抗氯离子渗透性能的影响

Influence of Vibration Mixing Parameters on the Resistance to Chloride Ion Penetration of Concrete

摘要: 为了探索提高水泥混凝土抗氯离子渗透能力的新方法，对搅拌过程中影响混凝土抗氯离子渗透性能的部分因素及其影响规律进行了初步研究。主要从振动搅拌装置的振幅、频率和搅拌线速度等参数发生变化时对混凝土抗氯离子渗透性能的影响规律进行了正交试验研究。研究结果表明，当选用振幅取1.93 mm，振动频率取35 Hz，搅拌线速度取1.4 m/s，新拌混凝土的抗氯离子渗透性能较好。且三个因素对混凝土抗氯离子渗透性的影响主次顺序为：振幅 > 振动频率 > 搅拌线速度。根据测试结果，提出了混凝土抗氯离子渗透性能的BP神经网络预测模型，为工程设计提供参考。振动搅拌为提高混凝土耐久性提供了一种新的途径。

Abstract: In order to explore a new method to improve the anti-chloride ion permeability of cement concrete, some factors that affect the anti-chloride ion permeability of the concrete during the mixing process and their influence rules have been preliminary studied. Orthogonal experiments were conducted mainly from the influence of the vibrational mixing device’s amplitude, frequency and mixing linear speed on the impact of the concrete’s anti-chloride ion penetration performance. The research re-sults show that when the amplitude is 1.93 mm, the vibration frequency is 35 Hz, and the mixing linear velocity is 1.4 m/s, the fresh concrete has better resistance to chloride ion penetration. And the primary and secondary order of the influence of three factors on the anti-chloride ion permea-bility of concrete is: amplitude > vibration frequency > mixing linear velocity. According to the test results, a BP neural network prediction model for the anti-chloride ion permeability of concrete is proposed to provide a reference for engineering design. Vibration mixing provides a new way to improve the durability of concrete.