Research Of The Traffic Weighting Monitoring System Based On The Pressure-sensitivity Of CFRC

Carbon fiber-reinforced cement-based composites, one branch of the intelligent material, is arousing more and more attention in home and broad, but most of the research focalizes on the Carbon fiber-reinforced mortar (CFRM) and the research of the carbon fiber-reinforced concrete (CFRC) is rarely mentioned now.The pressure sensitivity is one the most important properties of CFRC. Previous studies have showed that , within the elastic regime, the fractional change in electrical resistance, decreased during pressure loading and in each cycle and increased during unloading in each cycle. We are tying to apply this pressure-sensitivity property to the traffic monitoring system.The mechanical property and the sensitivity of carbon fiber reinforced concrete are different from that of the carbon fiber mortar because of the coarse aggregate, so the mix proportion and the measurement method of the carbon-fiber reinforced concrete are introduced in the first chapter. The mechanical and pressure-sensitivity properties of the concrete are also involved. Reasonable fiber content is confirmed by comparing the comprehensive property of concrete with different fiber content in the same conditions.Many factors have impact on the measured resistance of carbon-fiber reinforced concrete due to its complicated mechanism of conductivity. Advanced measures have been taken to resolve the problems encountered in the resistance measurement .Influences of the environmental conditions, such as temperature and humidity, on the electrical and pressure-sensitivity prosperities of carbon-fiber reinforced concrete are introduced in the third chapter.Chapter four is the emphases of this paper. The collocation of the flaky electrode and the collection method of the DC electrical signals are listed amply in this part. Also, the weighting in motion system of strip sample based on the pressure-sensitivity is studied. The fractional electrical resistance system of carbon fiber reinforced concrete for traffic monitoring and weighting in motion was demonstrated in the laboratory for stresses from 18 KN up to 100KN. The result of the experimentation indicates that Under the Hierarchical-loading, the fractional change in the electrical resistance is also hierarchical according to the level of the load This result testify that the applying of the carbon fiber-reinforced concrete is practical.