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<br />I)02!z54 <br /> <br />Durango Pumping Plant - Stage I <br /> <br />Amendment 00 I <br /> <br />b. Accelerating admixture shall not introduce more than 1/10 of 1 percent <br />chloride, by weight, of cementitious materials in shotcrete in which <br />galvanized metalwork is to be embedded. <br /> <br />c. Accelerating admixture shall not introduce more than I percent chloride, <br />by weight, of cementitious materials in all other shotcrete. <br /> <br />2. Powder accelerator may be used for dry-mix process shotcrete and shall be <br />protected from contamination and moisture until it is introduced into the <br />shotcrete. <br /> <br />3. Do not use powder accelerator in wet-mix process shotcrete. <br /> <br />4. Protect liquid accelerator from contamination and freezing until it is used in <br />shotcrete. Thoroughly remix liquid admixture before use if there is any <br />settlement or nonuniformity of the liquid. <br /> <br />5. Water-reducing, set-controlling admixtures may be used. <br /> <br />6. The amount of air-entraining admixture used for the wet-mix process shall be that <br />amount necessary to effect a total air content in the shotcrete, prior to application, <br />of 7 percent plus or minus I percent by volume of shotcrete. <br /> <br />C. Water: Section 03300 - Cast-in-Place Concrete. <br /> <br />D. Sand and Coarse Aggregate <br /> <br />I. Except as provided for coarse aggregate, the sand and coarse aggregate shall be in <br />accordance with Section 03300 - Cast-in-Place Concrete. <br /> <br />2. Nominal maximum size coarse aggregate: 3/8 inch. <br /> <br />3. Oversize aggregate: No material shall be retained on the 7/16-inch test screen or <br />sIeve. <br /> <br />4. Undersize aggregate: No more than 3 percent material passing a No.5 United <br />States Standard sieve. <br /> <br />2.02 MATERIALS FOR CURING SHOTCRETE <br /> <br />A. Water: Meet the applicable requirements of Section 03300 - Cast-in-Place Concrete for <br />water used in mixing and curing concrete. <br /> <br />B. Curing compound: Meet the applicable requirements of Section 03300 - Cast-in-Place <br />Concrete, except that no curing compounds shall be used between applications of <br />shotcrete when more than one application is employed to provide design thickness. <br /> <br />2.03 EQUIPMENT <br /> <br />A. Use equipment capable of handling and applying shotcrete containing the specified <br />maximum-size coarse aggregate and accelerating admixture, if used. <br /> <br />Shotcrete <br />03370 - 3 <br />