Laserfiche WebLink
PHILLIPS MINING, GEOTECHNICAL 8 GROUTING, INC. <br />and allow it to be brushed and washed off later, to expose the aggregate to which the <br />concrete, at the resumption of pouring, can bond. The downstream vertical face of the <br />upstream concrete pour must also be treated in a similaz manner (by coating the inside face <br />of the downstream form with the equivalent retarder for forms) to allow the subsequent <br />bonding of the next pour to this face. <br />The concrete must be placed in the forms using a suitable concrete pump. During the <br />placement, the concrete must be pumped through pipes placed at suitable locations in the <br />forms to ensure that it is not dropped more than 6 to 7 feet and that it is reasonably evenly <br />distributed over the complete pour plan azea. Concrete placement pipe(s) and air bleeder <br />pipe(s) must be located in the forms and up into the back of the drift, amongst the <br />cribbing, so that efficient dispersal of the concrete is achieved and the drift is filled up to <br />the back as completely as possible. This will require at least 2 to 3 placement pipes in <br />each pour. <br />As noted above, grouting will be required around the plug, especially on the interface <br />between the concrete and rock. Grouting will be performed around each individual <br />section of the plug. This will commence four weeks after the completion of each concrete <br />pour. In addition, some grouting of the rock, for a few feet around the plug, will probably <br />also be required. <br />5. PLUG CONCRETE REQUIItEMENTS <br />The concrete mix design and the achievement of the required concrete properties and the <br />testing thereof, is the responsibility of the contractor. As in all concrete construction, care <br />must be taken to provide the correct blend of materials in the concrete for the plug, not <br />Page 5 <br />