科研之友
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摘要
The mechanical properties of embedded reinforcement seriously affect the stability of rammed earth. However, more researches was focused on to analyze the mechanical properties of rammed earth to put forward improvement measures, but there were few studies on the impact of embedded reinforcement in rammed earth. In this paper, the effect of temperature alternation on mechanical properties of embedded reinforcements in rammed earth was investigated through microscopic morphology analysis and electrochemical experiments. The results showed that with the increase of the cycles, the mechanical parameters (including yield strength, tensile strength, section shrinkage and elongation rate) all decreased, and the mechanism characteristics of 20MnSi steel changed from plastic to brittle at T-c = 30 cycles. The corrosion current density increased rapidly from 6.29x 10(-3) A/m(2) (T-c = 20 cycles) to 62.84x 10(-3) A/m(2) (T-c= 30 cycles), and then basically remains unchanged, while the cathodic process changed from oxygen diffusion control to activation control. This is because temperature alternation destroyed the mesh skeleton structure of 20MnSi steel, and 20MnSi steel precipitated the second phase mainly composed of Ni and Cr element, which caused decreasing corrosion resistance and plastic of 20MnSi steel.
