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Here are technical definitions for the two:

Contact Grouting is the filling of voids between a structure (typically a lining) and the host geologic material.

Consolidation Grouting is the filling of rock discontinuities.

As far as your question concerning the consumption rate of cement for contact grouting it is dependent on numerous variables, the lining method, the quality of the lining, the grouting pressure, the grouting refusal criteria, the timing of the grouting, etc.

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