Composition, method and system for stabilising a rock mass

An injectable composition for stabilising a rock mass by pumping the injectable composition through a rod into a hole in the rock mass, the composition including:

• a Part AB including a Part A including water and a hydration inhibitor and a Part B including gypsum;
• and, a Part C including an activator and water,
• wherein the composition is formed by mixing Part AB with the Part C immediately prior to introduction into the rock mass to provide the injectable composition,
• wherein the Part AB is adapted to remain at a first viscosity below a pumpable viscosity threshold for a first time period of at least about 10 minutes, and
• wherein the mixing of the Part C with the Part AB results in the injectable composition having a second viscosity initially at least about 1,000 cps less than the first viscosity so as to be suitable for injection into the rock mass, the second viscosity increasing over a setting time period such that the composition becomes set within the rock mass.