梯形阳极系统监测混凝土耐久性的试验研究

Experimental Study of Concrete Structure Durability Monitoring Using Anoden-Leiter

半电池电位法是混凝土耐久性监测的主要方法之一,目前应用最广的传感器主要是德国SensorTech公司的阳极梯系统。由于混凝土耐久性的演变是一个长期的过程,靠实际工程对该监测技术的实际效果还难以在短时间内做出评价。因此,需要通过试验进行检验和解读监测数据与混凝土状态的相关性。针对该梯形阳极系统,设计制作了与实际背景工程相同的混凝土试件。通过对整个混凝土试件连续数月的加速腐蚀试验,检验该技术在混凝土结构腐蚀监测上实用效果。在本试验中,总体上随着氯离子渗透的发展,阳极梯读数伴随相应变化。各阳极棒电位按顺序先后呈现负移变化,并与氯离子渗透深度具有显著的相关性。就现有的试验结果看,采用该阳极梯对混凝土结构进行监测是可行的,总体上可以较好地跟踪氯离子侵入状况和发展速度。

Semi-cell potential method is one of the main techniques of concrete durability monitoring.The sensor widely used is the AnodeLeiter system(ALS)of Sensor Tech of Germany.Since the evolution of concrete durability is a long-term process,the actual effect of the monitoring technique needs to be tested and evaluated.The test specimens for concrete durability monitoring test are designed based on the actual engineering background.Through the accelerated corrosion test of the whole concrete specimens,the practical effect of the technology and the sensor on corrosion monitoring of concrete structure is verified.In this experiment,the electric potential of each anode is negatively shifted in a sequence with corrosion development,and it shows a significant correlation with the penetration depth of chloride ion.The existing test results show that use of the anode ladders to monitor the concrete structure is feasible,and the penetration and development speed of chlorine ions can be tracked well in general.