Hydrophobic treatment of concrete
article
As part of the maintenance policy of the Dutch Ministry of Transport, Civil Engineering Division, hydrophobic treatment of concrete was considered as an additional protective measure against penetration of aggressive substances, for instance deicing salts in bridge decks. A set of tests was designed to determine the performance of commercially available silicone-based products, using typical 'bridge' concrete (made with OPC or blast furnace slag cement). Nine products were tested; three complied to all requirements. Treated and non-treated concrete specimens were exposed to weekly salt ponding/drying cycles for 12 months. The amount of chloride that had penetrated into the hydrophobic concrete was about 20% of that in the controls. Durability of the hydrophobic effect was tested by outdoor exposure. During a two year test the water repellent effect remained constant. The influence of outdoor conditions, like temperature and moisture, during application was investigated. Also other application variations were investigated
TNO Identifier
329066
Source
Internationale Zeitschrift für Bauinstandsetzen, 2(2), pp. 145-160.
Pages
145-160
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