Study On Preparation And Properties Of Electrically Conductive Concrete Made With Superfine Stainless-steel Fiber

Using conductive concrete pavement is an environmental-friendly, effective and feasible way for snow melting and deicing in winter. Therefor, development of high performance conductive concrete is of great importance. In this paper, stainless-steel fibers having a number of excellent characteristics are used as conductive medium to prepare conductive concrete. Finite element thermal simulation of pavement and a series of experimental research are combined to discuss this subject in-depth. The main research contents and results are as follows.(1) ANSYS is used to construct the model of road surface warming and the model of deicing, and successfully carry out simulations under different environmental conditions. The main factors influencing the effect of surface warming and deicing are analysied. Finally, the design parameters of the electrically conductive concrete system is given based on simulation and analysis results.(2) Focusing on preparation, on the one hand, the preparation process for stainless-steel fiber concrete is found through the improvement of preparation technology of traditional fiber concrete. On the other hand, different factors which affect electrical conductivity and mechanical properties of stainless-steel fiber conductive concrete(SSFCC) are experimental researched. And an appropriate proportion ratio is found.(3) Considering the changes of the SSFCC electrical resistivity with age, humidity and temperature, the resistivity stability is correspondingly researched. It indicates that the resistivity stability of the SSFCC is excellent.(4) Taking advantage of cold and snowy weather in winter of Harbin, the SSFCC slab is performed surface warming tests, deicing tests, snow melting tests and real-time snow melting tests outdoor. In addition, making use of freezer to simulate low temptature environment, the SSFCC slab is also performed surface warming tests, deicing tests indoor. All these experiments proved the correctness of simulation results and the feasibility of using the SSFCC for snow melting or deicing.(5) The SSFCC is comparaed comprehensively with PAN-based carbon fiber conductive concrete(CFCC) in respects of electric conductivity, mechanical properties and the ability of melting snow and ice when made into slab. It demonstrates that the SSFCC has excellent comprehensive properties.