 Rock Grouting Overview
Selecting Grout and Additives Grouting Equipment Grouting Procedure For each application of grout, it is necessary to select a starter mix, and then as grouting of the hole proceeds, decide whether to thicken the mix during grouting. Choosing a good starter mix will come from experience at a particular site after several holes have been grouted. At most sites a good starting point is a 2:1 (water:cement by weight) mix. Table 1 provides further guidelines for selecting a starter mix: Table 1 Starter Mix Guidelines Water Test Results indicate UL<5 | 3:1 w:c | Water Test Results indicate UL 5-30 | 2:1 | Water Test Results indicate UL >30 | 1:1 | Joints greater than 2.5 mm wide | 0.8:1 |
Table 2 Typical Grout Mixes for Microfine Cement Grouting W:C | 1:1 | 1.5:1 | 2:1 | Water (kg) | 30 | 45 | 60 | Bentonite (kg) | 0.5 | 1.0 | 1.5 | Microfine Cement (kg) | 30 | 30 | 30 | Superplasticizer (ml) | 300 | 300 | 300 |
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