A grouting system is described for use in anchoring a reinforcing member such as a rock bolt in a hole, by the reaction of the mixed components of a primarily inorganic grouting composition so as to form a hardened grout around the reinforcing member. The reactive components include, as a first component, a particulate inorganic cement mixed with a liquid which is non-reactive therewith to form a slush or sludgy mass and, as a second component, separated from the first, a liquid which is reactive with the cement, a particulate aggregate such as sand preferably being present in the cement slush and/or the reactive liquid component. A high-early- strength grouting system for anchoring a reinforcing member in a hole includes a hardenable inorganic grouting composition containing an acidic component comprising an acidic oxy phosphorus compound; a basic component comprising a basic Group II or III metal compound, e.g., MgO; water; and aggregate, e.g., sand; the basic component preferably being in the form of a slush with a non- reactive liquid.
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