Ballast bonding

Ballast bonding is primarily used for rehabilitation works to existing rail embankments. The ballast that is already in place is bonded on one or both sides to provide stability prior to any excavation along the track. Through bonding, the track bed retains its ballasted form and allows continued operation of the railway line during the works.

Ballast bonding does not involve grout injection in the normal sense. Here, the injection product is simply sprayed onto the ballast to form a protective and adhesive layer on the base. The loose ballast is converted into a solid block that automatically remains in place.

Non-foaming polyurethanes that form a tough, elastic grout body are the most suitable product for this purpose.