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<br />002432 <br /> <br />Durango Pumoing Plant - Stage 1 <br /> <br />1) Formed surfaces where indicated on the drawings. <br /> <br />2) Sack-rub surfaces after all required patching and correction of <br />imperfections have been completed as follows: <br /> <br />a) Thoroughly wet and commence sack rubbing while <br />surfaces are still damp. <br /> <br />b) Use mortar consisting of 1 part cement; 2 parts, by volume, <br />of sand passing a No. 16 screen; and enough water so that <br />the consistency of the mortar is that of thick cream. <br /> <br />c) Blending of cement with white cement may be necessary to <br />obtain a color that will match that of the surrounding <br />concrete surface. <br /> <br />d) Thoroughly rub mortar over the area with clean burlap or a <br />sponge rubber float so as to fill all pits, bugholes, and other <br />defects. <br /> <br />e) While the mortar in the pits is still plastic, rub the surface <br />over with a dry mix of the above proportions and material <br />to remove the excess plastic material and place enough dry <br />material in the pits to stiffen and solidify the mortar so that <br />the fillings will be flush with the surface. <br /> <br />f) Remove all material from the surface except that within <br />the pits. <br /> <br />g) Continue curing the surface as specified. <br /> <br />D. Unformed Surfaces <br /> <br />I. The classes of finish for unformed concrete surfaces are designated by the <br />symbols UI, U2, and U3. <br /> <br />2. Slope interior surfaces for drainage where shown on the drawings or directed. <br /> <br />3. Surfaces which will be exposed to the weather and which would normally be <br />level: slope for drainage. <br /> <br />4. Provide the following slopes unless the use of other slopes or level surfaces is <br />indicated on the drawings: <br /> <br />a. Narrow surfaces, such as tops of walls: slope approximately 3/8 inch per <br />foot of width. <br /> <br />5. Finish U1 (screeded finish) <br /> <br />a. Unformed surfaces that will be covered by fill material, grout, or concrete. <br /> <br />b. First stage of finishes U2 and U3. <br /> <br />c. For finishing operations provide sufficient leveling and screeding to <br />produce even uniform surfaces. <br /> <br />Finish U2 (floated finish) <br /> <br />6. <br /> <br />, <br /> <br />Cast-in-Place Concrete <br />03300 . 28 <br />