Waterstops for concrete constructions

Our company can offer a wide-ranging assortment of waterstops for concrete constructions. These products are manufactured from high-quality standardize materials, so they are absolutely suitable for all concrete structures with exalted technical requirements:

• bridges;
• chemical plants;
• industrial buildings;
• water and sewage treatments;
• power stations;
• locks;
• swimming pools;
• retaining walls;
• dams;
• clear-water reservoirs;
• tunnels;
• culverts;
• abudments;
• etc.

We purvey all types: reinforced, constructional, expansion and corner joint, welded on, capping, T-lining (T-lock) waterstops, also waterstops for clamped constructions, compression profiles, shrinkage tubes, etc.

Watertops for concrete constructions (series H)

Considerations for the selection of waterstops:

Waterstops are used for the sealing of structural joints in concrete constructions and must be permanently water-tight. The selection of the suitable waterstop depends on the influences to which the structure is subject:

a) Influences due to shrinkage, contraction, temperature cycles, dynamic loads, etc.;
b) Water loading from pressure water, surface water, groundwater, etc.;
c) Joint type (expansion and contraction joints type I/II, compression joints, construction joints, etc.).

For structures designed to cope with extreme loads, special attention must be paid to the quality of the waterstops. The external quality control of Besaplast^® Kunststoffe GmbH is ensured by the Material
Testing Instute MPA in Dortmund. For waterstops fulfilling the requirements of DIN 18541 and 7865, a
quality control is mandatory.

Waterstops are generally subdivided into 3 categories:

a.  construction joint waterstops (internal / external);

b.  expansion joint waterstops (internal / external);

c.   capping joints.

While internal waterstops (fig. 1) are used on principle in every structure and structural component, external waterstops (fig. 2) are mainly installed under foundation slabs, in vertical structural components and in structures where pressurized water acting from inside and damage to the waterstop are excluded.

External waterstops must have the following minimum dimensions for pressurized water:

• 32 cm wide with 6 anchor webs, f = 20 mm;
• 25 cm wide with 6 anchor webs, f = 30 mm.

For internal (fig. 1) as well as for external waterstops (fig. 2) the following dimensions apply:   waterstop width = component width.

fig. 1

fig. 2

Capping joints with at least 1 anchor web (fig. 3) are used for the capping of joints not exposed to pressurized water. Those with at least 2 anchor webs (fig. 4) are used to complement systems of internal and external waterstops.

fig. 3

fig. 4

For joint capping strips, the following guidelines are applicable:

• non-pressurized water:
  at least 1 anchor web, f = 20 mm;
• pressurized water up to 8 m water column:
  at least 2 anchor webs, f = 20 mm;
• pressurized water up to 20 m water colum:
  at least 3 anchor webs, f = 20 mm.

The Besaplast^® shrinkage tube (fig. 5) is designed to recluse the cross section of structural shrinkage
cracks and to seal them. The run of the crack is determined by inserting triangular fillets. The shrinkage tube S1 will be used by wall thick then 350 mm. For bigger walls the shrinkage tube S2 should be inserted.

fig. 5

Material selection:

1. Besaflex^® (PVC-P) - for normal structural loads;
2. Nitriflex^® (in acc. with DIN 18541) - for higher structural loads and high resistance to chemicals
3. Elastoflex^® (in acc. with DIN 7865) - for higher structural loads with extensive joint movements, frequent load changes and / or low temperatures;
4. Polyethylene - for resistance to aggressive chemicals, permanent elasticity and resistance to microbes;
5. Thermoplastic elastomeric (TPE) - for exacting requirements with respect to elon-gation at tear and UV resistance.

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