Corrosion of Reinforcement in Concrete - Monitoring, by Papers from EUROCORR '97 - by Mietz, J.; Elsener, B.;

By Papers from EUROCORR '97 - by Mietz, J.; Elsener, B.; Polder,R.(eds.)

The result of study information and alertness of assorted prevention, security and remedial equipment are mentioned, including facets of the knowledge of the mechanisms of the procedures which are concerned. event within the box with the appliance of electrochemical equipment for cover and recovery and methods for tracking the safety are defined.

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24 Corrosion of Reinforcement in Concrete - Monitoving, Prevention and Rehabilitation Intercrystalline SCC is a selective type of corrosion with accelerated metal dissolution at the crack tip (grain boundary). In the case of low carbon steel the cathodic effectiveness of the grain faces is increased by the cementite layers (Fig. 5). This explains the high sensitivity of low carbon steels (see below). It was found that with decreasing concentration C, temperature T of the nitrate solution and mechanical stress uo the lifetime, L, until fracture takes place, increases.

00 Fig. 3 Potential of the same two electrodes (Fig. 2) 24 h later together with potentials of 4 additional electrodes (Refs 5-8) i n titofreshly immevsed mortar blocks. See text for further details. 1 - 0 30 60 90 Time (s) 120 150 180 Fig. 4 Potential of an embedded Mn0,-electrode in dry mortar against a surface-held SCE, using a sponge with tap water as the contacting electrolyte. Junction Potentials at a ConcretelElectrolyte Interjace 0 600 1200 1800 2400 37 3000 Time (min) Fig. 5 A repetition of the experiment in Fig.

Short Literature Review The primary 'inhibitor' for steel in concrete is the hydroxide ion (OH-) which when present at a sufficiently high concentration will promote the formation of a stable oxide/ hydroxide film (passive film) at the steel surface. While numerous other inhibitors have been suggested, only a small group has been seriously studied. Literature reviews have been published [7,8]. g. chromates). 1. Nitrites The efficiency of calcium and sodium nitrite as inhibitors in concrete has been reported by several authors [9,10] since the early 1970s.

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