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Protection of prestressing tendons in post-tensioned structures can be ensured by the injection of a grout in the duct; since contact with hardened cement paste provides the conditions for passivity of steel. If ducts are fully injected corrosion protection may be guaranteed for a very long time thanks to the alkalinity of the grout, unless incomplete filling of the duct (and thus the lack of grout...
This paper deals with the development of flowable soil–cement mixes to be used for filling underground cavities flooded by sulphate contaminated water. The research started from the need to backfill a former gypsum mine which was excavated with the chamber-pillar technique. The dissolution of gypsum and anhydrite, consequent to the flow of water inside the abandoned tunnels, and the possible collapse...
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