Study On Pressure Sensitivity Of Steel Slag Concrete

Under long working time, serious damage, even sudden breakage of ordinary concrete has happened because of environment corrosion, man-made factors and fatigue stress. So it is necessary to develop a healthy monitoring and self-adaptive control system for concrete structure, especially, for some infrastructures. The study of electrical performance and strain sensing would serve theoretical and experimental foundation for the smart concrete which could be integrated with the performance of loading, sensing and transmission.Steel slag is an off scum in the course of steel making, steel slag includes high content of iron oxide, therefore, this thesis chooses steel slag as conductive material and makes it as coarse and fine aggregate substitute. While little findings of pressure sensitivity of steel slag concrete have been got yet, thus, the thesis studied the electrical conductive performance and pressure sensitivity of steel slag concrete systemically by test analysis and researched the conductive mechanism.The National Natural Science Foundation of China (50404005) supports the project. The thesis analyzed the conductive mechanism of steel slag concrete by test analysis; analyzed the conductivity of steel slag concrete developed with diverse stress and studied the affecting factor. The results revealed:⑴Steel slag concrete had good performance in conductivity and mechanics, the ages and moisture content have a little affect for resistivity of steel slag concrete with a large content of ground steel slag.⑵The result showed that steel slag concrete had good pressure sensitivity, theresistivity decreased or increased with press accretion. Therefore, strain sensing could be used for stress evaluation in concrete.⑶The change of the resistivity revealed some regulation under different loading rate and long time loading etc.⑷The compression sensibility of steel slag concrete is measured when the specimen is restrained around the periphery. The result shows that the pressure sensitivity reduces when the specimen is restrained around the periphery.