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Sikalastic®-245

Spray applied waterproofing membrane for tunnels

Sikalastic®-245 is a spray applied waterproofing membrane based on a flexible EVA copolymer. It is designed for application on cementitious substrates such as spray concrete primary linings. After application, by dry sprayed process, the membrane cures quickly to form a tough and yet flexible film with a tenacious bond to the substrate. Once the Sikalastic®-245 has cured a secondary lining of sprayed concrete or cast in situ concrete is installed against it creating a fully bonded composite lining.

  • Double bond (to primary and secondary lining) prevents lateral water migration
  • Fast curing allows rapid installation of secondary lining
  • Quick wetting polymer ensures film formation with good continuity
  • Application by dry spraying results in high application rates: 50 – 100m2/h with hand spray and 180m2/h with robotic arm
  • High elasticity
  • No toxic components
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Usage

  • Permanent sprayed concrete linings including Composite Shell Linings (CSL).
  • Underground structures with changeable geometry such as: cross pasages, ventilation and escape tunnels, shafts and sumps.
  • Diaphragm and secant pile retaining walls.
 

Advantages

  • Double bond (to primary and secondary lining) prevents lateral water migration
  • Fast curing allows rapid installation of secondary lining
  • Quick wetting polymer ensures film formation with good continuity
  • Application by dry spraying results in high application rates: 50 – 100m2/h with hand spray and 180m2/h with robotic arm
  • High elasticity
  • No toxic components

Packaging

15 kg / 20 kg bag (adapt with local packaging)

Colour

Beige powder

Product Details

Sustainability / Certifications / Approvals

CERTIFICATES AND TEST REPORTS

  • Test for use in contact with water intended for human consumption, according to SS 375:2001 and BS 6920:2000, (subject to local regulation)
Product Information

Composition

EVA polymer and cement

Shelf life

12 months from date of production if stored properly in undamaged and unopened original sealed packaging in dry and cool conditions

Storage conditions

Store properly in undamaged and unopened original packaging in cool and dry conditions between +5 °C to +40 °C. The product must be kept out of direct sunlight. The storage area must be kept dry.

Bulk density

590 g/l ± 100 g/l (20 ºC)

 
Technical Information

Tensile strength

2.7 MPa

  • Specimens conditioned at 23°C, RH 50%

  • Type 5 Specimen

  • Test Speed 100mm/min

(EN ISO 527-3; ISO 527-1)

Crack bridging ability

Class A5 (minimum 2.5 mm) at 20ºC

(EN 1062-7)

Tensile adhesion strength

> 0.5 MPa at 28 days

(EN 1542)

Elongation at break

144%

  • Specimens conditioned at 23°C, RH 50%

  • Type 5 Specimen

  • Test Speed 100mm/min

(EN ISO 527-3; ISO 527-1)

Watertightness

Zero Penetration 28 days at 5 bar

(EN 12390-8)

Water penetration under pressure

Zero Penetration 28 days at 5 bar

Resistance to leaching

  • Hot water

  • Saturated Ca(OH)2

(EN 14415)

Chemical resistance

  • 2.5 g/l Ca(OH)2

  • 10 % NaCl

  • Site Water (C883, C882)

(EN 14414)

Reaction to fire

Class E/EFL

Application

Application Information

Layer thickness

3 to 6 mm

Ambient air temperature

+5°C to +40°C

Relative air humidity

Sikalastic®-245 cures and forms a film by evaporation, if relative humidity is too high or ventilation is insufficient then curing times can be extended.

Consumption

Consumption

Between 3 and 6 kg/m2 depending on roughness of the substrate.

Application of a regulating layer of shotcrete without coarse aggregate is recommended to reduce the surface roughness and limit the consumption of Sikalastic®-245.
Application steps

EQUIPMENT

Sikalastic®-245 is applied by the dry spraying method with an air/electrical driven pump, such as Reed Sove dry spraying machine or similar.

Basic recommended equipment set-up:

  • Equipped with 18 hole pocket bowl

  • 32mm nozzle system with 18 hole water ring

  • Dust collector

  • Water supply booster pump

  • Compressed air supply 6 bar @ 5m3/min

  • Water interceptor on compressed air

SUBSTRATE QUALITY

A smooth surface without free-standing water must be achieved. If the surface is to rough, it is recommended to do a regulating layer with a smoothing mortar or sprayed concrete to obtain an appropiate substrate and control the consumption of Sikalastic®-245.

The surface must be thoroughly cleaned and pre-wetted before spraying Sikalastic®-245.

MIXING

Sikalastic®-245 is mixed with water with a dosage between 45% and 75% of water by weight of powder, depending on the substrate and ambient site conditions. Recommended amount of water around 55% ± 10%.

APPLICATION

Spray the Sikalastic®-245 continuosly over the prepared surface with the dry spraying pump. The application of Sikalastic®-245 can be done in one layer ensuring proper coverage of the full substrate.

Sikalastic®-245 can be also hand applied using a brush, for small repairs or spot applications if needed.

 

CURING TREATMENT

The speed of curing depends on weather conditions on site (humidity, wind conditions and temperature). We recommend not exposing the membrane to air temperatures outside the range of +5 °C and +40 °C for a minimum of 5 days following application, and cyclic variations should not exceed 10 °C within this range.

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