Waterproofing Underground Concrete Structures.

摘要

Waterproofing is a relatively impervious membrane, coating, or sealer used in concealed locations to prevent water from entering or passing through either horizontal or vertical building materials. Waterproofing is designed to exclude water even when the water is under a hydrostatic head. Waterproofing is often confused with clear water repellants and bituminous dampproofing. Clear water repellants are intended to reduce water penetration into building materials by capillary action. They are normally used on exterior wall surfaces above grade to prevent damage of horizontal concrete by water, sodium chloride or other ice melting chemicals. Some clear water repellants coatings may also prevent soiling and staining and are frequently used on limestone and concrete for that purpose. Clear water repellents will not prevent the passage of water under a hydrostatic head of from air pressure. Bituminous dampproofing is a coating that is used to prevent building materials from absorbing moisture that may migrate further into the building structure.