Sika Deutschland GmbH has been the key supplier of the German Railways for a range of coatings, sealants and adhesives for more than 100 years. The flexible grouts of the Icosit® KC 300 range have won worldwide renown for tailor made, long lasting direct fixation of rails to solid substrates, i.e. concrete and steel. They are incorporated in a variety of trackwork designs, in discrete and continuous fixation, embedded/floating rail, lawn track, for railway, light rail, tram and crane track installations.
Sika provides design and technical assistance to consultants, operators and contractors for optimum and innovative trackwork solutions under a wide variety of conditions of exposure, for wheel loads ranging from 4 to 75 metric tons.
FLEXIBLE POLYURETHANE GROUTS FOR TRACKWORK
These load-bearing, flexible polyurethane grouts of the Icosit® KC 330/Icosit® KC 340 range fulfil 4 main requirements for direct fixation:
- Levelling out inevitable tolerances between rail and concrete or steel substrate
- Highly efficient electrical insulation for prevention of stray current leakage as a safeguarding against signalling malfunction, electrochemical corrosion and data transfer interference
- Resilient intermediate layer for optimum reduction of noise and vibration transmission, i.e. vibration damping, cast-in-situ after alignment to eliminate any point loads
- Powerful adhesive for added safety and maximum performance
HIGH PERFORMANCE COMBINED WITH LONG DURABILITY
Successful dynamic performance tests with minimum 3 to 4 million cycles are a prerequisite for market introduction. Field tests with the German Railways proved that during 28 years of exposure to dynamic stress and weathering, with virtually no maintenance, the reduction in flexibility of the Icosit® KC 330 flexible grout was only marginal. The University of Calgary confirmed suitability for service temperatures from -40°C (-40°F) to +70°C (+158°F). Field test reports confirm reduction of structure borne sound transmission of up to 18 dbA. The high performance is also governed by the fact that these flexible grouts contrary to pure elastomers – are all somewhat compressible which is absolutely essential to compensate for the unfavourable shape factor in practice and to retard the "bouncing back" effect.