Base plate
Air pressure relief holes (8 to 10 mm dia) shall be made at four corners and one in the middle into the base plate to release entrapped air during grouting. The base plate must be free from oil, grease or any other deposits.
Formwork
The formwork shall be placed all around the base plate. It must be leak proof and this can be achieved by using rubber strip or mastic sealant beneath the formwork. Dry cement mortar also can be used for this
Mixing and placing
For consistent and homogeneous mix, mechanical mixer should be used. To mix material up to 50 kg, a heavy duty slow speed (400-500 rpm) mixer with paddle is suitable.
Measure the exact quantity of water required as per consistency required. Do not exceed 0.16 water powder ratio under any circumstances. Use of ice-cold water is recommended in hot climate (above 35 deg C). Empty premeasured water into a suitable bucket and add the entire quantity of powder slowly. Mix using heavy duty drilling machine with paddle attachment for 4-5 minutes.
To enable the grouting operation to be carried out continuously, it is essential that sufficient manpower and mixing machines are available at site.
Placing
Place the mixed grout from one end continuously till the required depth is filled. The grout can be placed up to 100 mm thickness. For higher thickness 10 mm down well-graded clean aggregates up to 50 % by weight of Pidigrout 10M, can be added to minimize the heat built up.
All the bolt pockets shall be grouted prior to base plate grouting. Sufficient material shall have to be mixed at site for continuous operations.
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