Bridge Deck Waterproofing

Bridge Deck Waterproofing

The General

Drawings shall define the concrete surfaces to be covered by the waterproofing scheme of the bridge deck. In this respect, DN-STR-03012 sets the norm.


The Employer’s Agent can ensure that the Contractor issues the NSAI Agrément Certificate or equivalent for the proposed bridge deck waterproofing device as soon as possible after the contract has been awarded.

The Employer’s Delegate may need to ask for a site protocol trial to validate the waterproofing device’s appropriateness to local site requirements while evaluating the Contractor’s additional details submitted with the NSAI Agrément Certificate or similar to cater to site conditions.


The General

When it has been fully stabilized to stop the waterproofing device’s displacement during the laying of an external protective sheet or barrier, a bonding agent or liquid waterproofing membrane/adhesive has been set or cured; this technique is mostly used in building waterproofing services.

The primer should be thoroughly dried or cured before the membrane is added unless otherwise defined in the relevant NSAI Agrément Certificate or equivalent. Any residual primer that has not been cleaned is likely to ‘skin over’ as solvent-based primers are used, so it provides the illusion of being dry. Under the introduction of hot bitumen, the trapped solvent can spread quickly and lead to membrane failure.

In the definition, the use of ventilating layers, partial bonding, or bond breakers is not allowed as they provide a simple passage under the membrane for water to flow through. The pumping action created by the selection of vehicle wheels exacerbates the problem and quickly contributes to the total loss of adhesion and floor disturbance.

To ensure the long-term efficiency of a bridge deck waterproofing scheme, including the use of fillets and chamfers, good detailing is essential. For the specifications in this respect, refer to DN-STR-03009.

Sealing can be seen on the drawings of the waterproofing device’s margins and around interruptions such as gullies. In their marketing materials, the majority of manufacturers of certified systems give examples.

Preparation for Surface

Before each installation level starts, the surface should be tested to verify the solvent’s full evaporation, eliminating any stuck aggregate or debris. The needed repairs have been carried out.

Requirements for Temperatures

Spring, summer, and fall, when atmospheric conditions are more favorable, are the most acceptable times for building waterproofing systems.

Requirements for Concrete Ages

‘Young’ concrete appears to have a more considerable degree of surface moisture. Additional caution is then taken to ensure that the required moisture content has been obtained before the waterproofing method is implemented. Significant drying of the flame could be necessary.

The substrate would still be saturated after a prolonged rainfall cycle, and flame drying will dry the immediate surface; however, significant moisture will remain. Before applying for waterproof, care should be taken to establish that the substrate has a good moisture content.

Deficiencies and Maintenance

Should the primed area be affected, the proper primer should be used to correct and allow the requisite evaporation or curing period.

Moisture in the concrete deck, inadequate primer distribution, unevaporated solvents in primers, and general outgassing can result in continuous or non-continuous pin/blow holes in the membranes added to the liquid this method is done by most waterproofing services provider in Bangalore. Permitted waterproofing devices should be protected without unnecessary delay, including, if possible, a tack coat and an external protective covering.

With road surface materials to mitigate blistering harm within days, unless otherwise decided with the Employer’s Representative. In late spring and early summer, the blistering chance is typically more prevalent during bright sunshine conditions. If blistering happens, the NSAI Agrément Certificate or similar may be liable for repairs. With insufficient equipment or poor applied technique, there might be a propensity for sprayed coatings not to penetrate right into the angle but to build up thickness on the adjacent edges, increasing the membrane thinning. It is possible to choose the provision of fillets and spraying methods, substance rheology, and facilities to reduce

Outgassing Out

Many bridge decks’ construction involves voids that hold air, and air may be kept within the concrete itself. This air movement can move in and out of holes with temperature and barometric pressure changes. Such air movement through pores in the bridge deck top surface can cause pinholes in primers and thence blister the liquid applied membrane in the partially cured condition. The size of the pores reduces as concrete ages. Concrete aged less than 28 days can also be more vulnerable to outgassing than older concrete.


It should be ensured that the surface is, and is, free of any loose materials and is stable enough to withstand traction forces until rubber-tired plants and machinery are allowed to travel on bridge deck waterproofing.

If the plant and facilities must be trafficked with the extra protective cover, e.g., if there is a delay in surfacing, any disruption must be incurred right before the surfacing is laid.

To confirm the soundness of the waterproofing sheet, non-destructive checking by CC-SPW-02000 must be used.

Testing Requirements

Repair and Substitution

Appendix 20/1 should identify any particular specifications for the rehabilitation or removal of bridge deck waterproofing systems. Things that might be important to discuss include:

  1. Data on the latest schemes of waterproofing;
  2. Removal criteria for existing surfaces;
  3. Requirements for working in planning
  4. Requirements for the waterproofing repair device.

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