By R. T. L. Allen (auth.), R. T. L. Allen, S. C. Edwards, J. D. N. Shaw (eds.)
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Additional resources for The Repair of Concrete Structures
American Society for Testing and Materials. 5. British Standard 1014. Pigments for Portland cement and Portland cement products. British Standards Institution, London. 6. British Standard 8110: 1985. Parts I and II. Code of Practice for Structural Concrete. British Standards Institution, London. 7. M. Properties of Concrete. Pitman,- London. 8. British Standard 882: 1983. Aggregates from natural sources for concrete. British Standards Institution, London. 9. British Standards 1199 and 1200: 1976.
If two dissimilar metals, electrically connected, are immersed in an electrolyte a current will flow between them, the rate of current flow being dependent on the relative nobility of the two metals on the electrochemical scale (10) and the electrical resistance of the circuit. The anodic metal, at which electrons pass from the electrolyte into the metal, will be dissolved at a rate proportional to the current flow. In a similar way, anodic and cathodic areas will be set up on the surface of a single metal that is immersed in an electrolyte of varying composition, with electrons leaving the metal at cathodic areas and entering it at anodic areas.
For this reason, epoxy resin bonding aids with adequate pot life and open time for the application conditions are also widely used (14, 15). As an alternative to polymer latex slurry bond-coats, there are now available factory-blended polymer modified cementitious bonding aids based on special spray-dried copolymer powders blended with cement, fine sand and other special additives which are simply gauged with water on site and applied to the prepared parent concrete to give a 'stipple' finish. Even when allowed to set overnight, this type of bonding aid gives a good 'key' for the repair mortar and prevents rapid loss of water from the repair mortar which may result in inadequate hydration and thus poor bond.
The Repair of Concrete Structures by R. T. L. Allen (auth.), R. T. L. Allen, S. C. Edwards, J. D. N. Shaw (eds.)