Contact grout is a repair material, usually consisting of concrete, that is used to fill voids between two surfaces that are in contact with each other. It is widely used in the installation and rehabilitation of pipes.
The development of trenchless construction techniques like those that take advantage of contact grout has contributed to the growth of the industry.
Contact grout is used in the construction of bridges, buildings, dams, railways, roads and retaining walls, as well as in the pipelines and tunnels of trenchless construction. In general, grout can be applied in a variety of ways.
Contact grout is used between two surfaces with unwanted gaps between them. It can seal gaps between a concrete tunnel lining and surrounding rock. The result is the consolidation of these materials.
One use of contact grout is to fill the annular space between installed pipes and the ground in which it is installed. It is also used to fill the annular space between a host pipe and a sliplining pipe liner.