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  Crystalline Waterproofing Systems for Tunnels

  This paper aims to present the capillary crystalline waterproofing systems that are recommended for tunnels, stations, shafts, etc. These systems can be supplied as admixture for concrete or applied as a coating over the concrete. They are different from the usual adhered or floating superficial systems by reacting with the water and cement paste in the concrete forming an internal crystalline net in the pores and capillaries. Due to this, the water and aggressive agents penetration are drastically decreased. The crystalline systems can be applied in cast "in situ", shotcrete and precast concretes. Some job sites cases are presented as the Corredor Duarte Tunnel, in Santo Domingo, Dominican Republic.

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