Waterproofing Underground Concrete Structures

Even where underground structures have been built using expensive waterproof concrete to bs 8007 consideration will still need to be given to the waterproofing of construction joints.

Waterproofing underground concrete structures. The utilization of liquid waterproofing membrane cementitious materials polyurethane liquid membrane and bituminous. Typical products are admixtures for watertight concrete combined with appropriate joint sealing systems for connections construction and movement joints. Waterstop is the most typically used waterproofing material in the construction of underground concrete structures to prevent water leakage at joints of discretely consecutive concrete structures. Underground water management sprayable membrane for waterproofing concrete structures.

Some require 14 days or longer. The protection of an underground structure can be performed using a positive side exterior or negative interior waterproofing system. Liquid water penetration is stopped by the structure itself and cannot entirely pass through into the basement. These for example can be used in water storage tanks wet areas basements stps tunnelling concrete underground structures and other similar structures.

Many government agencies have specified the performance requirements of waterstops in the construction of concrete structures. Usually there is no sealing membrane to prevent damp and water from penetrating the concrete. The function of the impermeable barrier is to prevent water penetrations. Others can be applied as soon as the forms are removed.

Most waterproofing systems need protection during backfilling. The building surfaces are made water resistant and sometimes waterproof. Classification and materials used in integral waterproofing damp proofing admixtures is given in table 1 below. Underground and foundation structures are vulnerable constructions when it comes to damp and water leakage.

Waterproofing concrete and brick in underground structures. In general the preferred system is a positive side waterproofing system that protects the structure from all types of attack while providing a tight waterproof membrane. Waterproofing is the formation of an impervious barrier over surfaces of foundations roofs walls and other structural members. Spray applied membrane can be applied between layers of sprayed or cast in place concrete or applied as a stand alone membrane exhibiting high bond strength to the substrates on both sides of the membrane.

The water vapor escaping from the concrete can prevent the waterproofing material from bonding.