ABSTRACT
Bi-component grout has emerged as a preferred option for the primary grouting of segments installed through mechanized tunnelling, not only for closed pressurized face but also non-pressurized face applications. Recent years have seen a transformation of bi-component grout from a proprietary product to a material increasingly subjected to standardized tests and specifications, as well as an extended user range. This contribution will discuss the current status of international standardization and the underlying testing in the context of performance requirements linked to specific aspects of design and construction and proposes areas for future research from a designer’s perspective.
