Research And Design Of Auto Testing System For Chloride Ion Permeability In Concrete

The paper introduces the method of research and design of a auto testing system for chlorine ion penetrability in concrete, and this system can exactly estimate concrete chlorine ion penetrability. The system is composed of vacuum water saturation instrument, coulometer test instrument of chlorine ion and computer analyses software, based on ASTM C 1202. Primary content of the paper involves several parts.1. The paper analyzes principle of ASTM C 1202 and the application of ASTM C 1202 to the system.2. The paper analyzes the working flow and design principle of Vacuum water saturation instrument, and accomplishes circuit design of Vacuum water saturation instrument.3. The paper designs and implements the hardware circuit of Coulometer testing instrument. It includes single-chip module, current measure module, temperature measure model, displaying and printing model of data, alteration module of people and machine, serial communication module and so on.4. The paper introduces the PC analysis software which bases on Visual C++. The software includes module of data processing, module of Access data base, module of graph plotting and module of data storage.5. The paper introduces some methods of anti-interference and enhancing precision of current measure, then analyses the effectiveness.6. The paper analyses the accuracy of current measure, and from the analysis of the measure, it makes a conclusion that the system has a high accuracy of current measure.The system has many virtues, such as good measure precision, good automation, convenience of manipulation, friendly software interface, anti-jamming and so on .It has been developed into practice and obtains good effect. So it has satisfied the demand of concrete wear inspect.