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In order to better study the corrosion of rebar inside reinforced concrete, the corrosion position of rebar inside concrete is judged. Put rusted rebar, no rusted rebar, mixed rebar (rust and non-rust) on one side of the concrete test piece, and mark the position of the rebar, use the four-polarization method to observe the resistivity and polarity of reinforced concrete, and study the concrete interior. The degree of corrosion of rebar, the corresponding relationship between the position change and its polarization rate, the results show that: the longer the age of concrete, the worse the conductivity of concrete, the polarization rate of rusted rebar is greater than the polarization rate of un rusted rebar, when rebar is pre-buried above concrete, The polarization rate measured by concrete is greater than that of reinforced pre-buried under concrete. The polarization rate of pre-buried rusted reinforced concrete, the polarization rate of pre-buried mixed rebar, and the polarization rate of pre-buried non-rusted reinforced concrete. It is shown that pre-buried rusted reinforced concrete is more likely to produce polarization effects. The results show that it is feasible to judge the degree of corrosion of steel bars inside concrete by using the four-polarization method.

In order to improve people's chances of survival, Multifunctional fire refuge compartment, a kind of emergency equipment, was invented when a high-rise building breaking out of fire. One key component of it is the environmental monitoring system of refuge cabin. Meanwhile, to ensure that the refuge chamber system can respond quickly and be stable operation, it takes an kind of intelligent control technology which combined with traditional PID control(Proportion、Integration、Differentiation)and fuzzy control technology, namely fuzzy PID control to regulate. In this paper, combined with the fuzzy control technology, we discuss the fuzzy self-tuning PID control method of refuge cabin environment monitoring system. Try to make digital processing of control system by MCU(Micro Control Unit), we use the Simulink and Fuzzy toolbox in MATLAB to simulate the refuge compartment cooling system which using the fuzzy PID control method and compare with the conventional PID control. The result shows that Fuzzy-PID control method reduces the overshoot of the system, shortens the settling time, decreases steady-state deviation, improves the static and dynamic characteristics of the system effectively. Finally, it can enhance the reliability and adaptability of the system.

With the high-rise building fire accidents have increased every year, the appearance of home fire evacuation cabin has a very important significance.At first,We introduced the development status of domestic and international mine refuge Chamber and two mine refuge Chamber products which was used commonly,and analysed their merit and shortcoming,where we could get the inspiration;Then we focused on the present situation of the household refuge compartment and analysis of its shortcomings and the main problems need to be solved;Finally we put forward the design concept of the household fire refuge cabin .

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