Hadian - Engineering Consulting of Mazandran Power Co. IRAN

All articles which, upt to now have been written about corrosiveness on the concrete poles in electrical fines, are concentrated on the chemical aspect of matter and mostly are remind us the action and reactions and affective results In them. In this article, the case is analyzed and shown with a completely different view, that the main cause of crack and degeneration In concrete has a mechanical aspect and related to the manner of structure against the input forces, and the chemical elements author to focus on the corrosiveness phenomena: 1- Concentration of maximum stress caused of maximum bending moment In the begining of pole. 2- Appearing of splits in the approximate bight of 1.5 m. from the bottom of the pole, 3- Nonexistence of conduct of poles with the earth on the crack points and usage of fresh water in the pole factories. The effective elements on the existance and expansion of fault and degeneration in concrete structures are : (a) ductility . (b) variable and periodical actions and tired some. (c) tughness. (d) brittleness. (e), are considerated and with presenting of suggestion, in the concluding of article. It is reminded that the first element of corrosiveness is a tiny and microscopic crack which in the point of maximum moment and concentration of stress in the first part of pole is appeared and the alternation of the stresses caused the expansion of cracks and In ultimately with the influence of water and rusting of steell has wore intensify and ultimately terminated to progressive failure.