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The concrete mix including cement, aggregates, water and any admixtures, additions or fibers shall be selected to satisfy all the performance criteria for the fresh and hardened concrete. Content materials Materials shall fulfill the general requirements given below. Specific requirements for materials for shotcrete machine are given below. 1 .Cements Cements shall comply with the requirements of EN197or alternatively with the national standards or regulations valid in the place of use of the shotcrete machine. Only cement with established suitability for shotcrete machine applications shall be used. 2 .Aggregates Aggregates shall comply with the requirements of the national standards and regulations valid in the place of use of the shotcrete machine and shall be appropriate to the requirements of the application. 3. Mixing water Water for mixing shall comply with the requirements of EN 1008 or the national standards and regulations. 4.Steel reinforcement Reinforcement shall comply with the requirements of EN 10080 for reinforcing steel and EN 10138 for prestressing steel or with the national standards or regulations valid in the place of use.