Rock mass grouting is an important aspect in Norwegian construction of underground space. Norwegian practice can be characterized with its use of high pressures, large grouting fans with many and long holes (Grøv 2014). In the research program TIGHT1 data relating to rock mass grouting has been collected and interpreted. This paper presents how some of the data from TIGHT was gathered, interpreted and how it can be used in practical rock mass grouting. This paper focuses on tests done on grouting materials.

The tests performed in TIGHTs work package 32 has demonstrated great variability in the characteristics of cement-based grouts. Among the tests conducted were:

  • Filtration test

  • Bleeding test

  • Marsh Cone test

The tests listed above requires simple equipment and it can be argued that they can be performed on-site during grouting operation. All the tests above are relative tests, but some3 are related to absolute values. Using the test results from TIGHT as a basis for comparison, these tests can be used on-site to determine if the cement used during grouting have preferable characteristics. Potential problems with the mix, mixer or type of cement can be identified. This can possibly aid in improving the grouting process and result.

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