Assume that the hole takes 6.50 cu ft of grout [ 185 litres] in this period.
The reduction in take shows that refusal is in sight. The specified pressure can be applied at last, and this indicates that most cracks are full and the grout has stiffened appreciably:
SUMMARY OF APPLICATION SO FAR - at 2 hours:
Permeability before grouting is more than 100 lugeons (high)
Water:cement ratio = 0.5:1. Pressure builds up to 50 psi [3.5 bars]
Total cement injected so far
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