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1 <br /> Microsilica is required and shall be a minimum of 5 percent by weight (mass) of <br /> cement, and a maximum of 10 percent. As an alternative to microsilica, high- <br /> reactivity metakaolin may be used at a minimum of 5 percent by weight (mass) of <br /> cement, and a maximum of 10 percent. <br /> Fly ash shall not be used in combination with ground granulated blast-furnace slag. 1 <br /> Class F fly ash shall not be used in combination with Class C fly ash. Microsilica <br /> shall not be used in combination with high-reactivity metakaolin. A finely divided <br /> mineral shall not be used in combination with a blended hydraulic cement, except <br /> for microsilica or high-reactivity metakaolin. <br /> The water/cement ratio as defined in Article 1020.06 shall be a maximum of 0.42. <br /> The air content as shot shall be 4.0 —8.0 percent. <br /> Note 6 Packaged shotcrete that does not include pre-blended aggregate shall be from the <br /> Department's qualified product list of Packaged High Performance Shotcrete, and <br /> independent laboratory test results showing the product meets Department <br /> specifications will be required. The shotcrete shall be according to Note 5, except <br /> the added aggregate shall be according to Articles 1003.02 and 1004.02 in addition <br /> to each individual aggregate meeting the maximum expansion requirements of <br /> Note 5. The aggregate gradation shall be according to the manufacturer. The <br /> shotcrete shall be batched and mixed with added aggregate according to the <br /> manufacturer. <br /> Note 7. In addition ASTM C 881, Type IV, Grade 2 or 3, Class A, B, or C may be used. <br /> Equipment. Equipment shall be according to Article 503.03 and the following. <br /> Chipping Hammer — The chipping hammer for removing concrete shall be a light-duty <br /> pneumatic or electric tool with a 15 Ib. (7 kg) maximum class or less. <br /> Blast Cleaning Equipment — Blast cleaning equipment for concrete surface preparation shall be <br /> the abrasive type, and the equipment shall have oil traps. <br /> Hydrodemolition Equipment — Hydrodemolition equipment for removing concrete shall be <br /> calibrated, and shall use water according to Section 1002. <br /> High Performance Shotcrete Equipment — The batching, mixing, pumping, hose, nozzle, and <br /> auxiliary equipment shall be for the wet-mix shotcrete method, and shall meet the requirements <br /> of ACI 506R. <br /> Construction Requirements <br />