SHOTCRETE (B35 M45 E1000, B35 M45 E700, B35 M45) PRODUCED ON MossIA RAILWAY PROJECT

This EPD® refers to Shotcrete fabricated and used by MossIA ANS at the Bane NOR Intercity (SMS 2A) Railway Project. It is a double rail project through and under the municipality of Moss in Norway. It consists of 2 tunnels: under Moss (2.7 km), and from Moss station to Carlberg (2.3 km); Moss Station (800m); 2 significant culverts: Kransen and Carlberg; and 10 km demolition of the existing tracks.

The shotcrete for rock support requires certain properties of strength, durability and minimum energy absorption. Its thickness is variable, and it depends on the type and quality of the rock mass. The material composition and design are suitable for the area of application to ensure that the reinforcement and fixing details are properly grouted. The material composition has reduced shrinkage properties. Due to technical requirements mentioned before, three dosages of shotcrete were developed and analyzed. The strength of different dosages of shotcrete was determined conforming to EN 12390-1, EN 12390-2, EN 12350-1 and NS-EN 206. The required compressive strength for cored samples converted to cylinders H/D=2.0 is specified by NS-EN 13791 to be 85% of the required characteristic strength. The shotcrete has a B35 strength class and 2.31 Ton/m3 of density. The life expectancy of the tunnel as well as the studied Shotcrete is at least 150 years taking into account technical requirements specified on the MossIA project.

Regarding to production process, there are two twins independent batching plants to produce concrete and shotcrete for the project. There is also a shed to store the aggregates and protect them against the weather. For producing shotcrete, all raw materials are mixed on the concrete plant, taking into account dosages determined on laboratory tests. Shotcrete produced is trucked to the tunnel for the application