5.4　Lining Concrete Mixing

5.4.1　Compulsory mixer shall be used for lining concrete mixing.Containers used for lining concrete shall be clean.

5.4.2　Lining concrete mixing shall be in accordance with its technical service conditions.The mixture shall be uniformly dispersed and consistent in color without any bleeding or segregation，and shall not contain any impurities.The consistency of mixture may be adjusted in accordance with product technical service conditions and based on the site temperature，humidity，transportation distance and application methods；however，it shall not exceed the limits specified in product technical service conditions.

5.4.3　On-spec mixed lining concrete shall be used up within the period of time specified in the product technical service conditions，and water addition and secondary mixing must not be allowed.

5.4.4　When metal reinforcing fibers are mixed，they shall be uniformly distributed without any agglomerates.

5.4.5　If semi-wetting type mechanical gunning application is used，monolithic refractory shall be prewetted when it is mixed，and powder should wrap up aggregates.Monolithic refractory shall be gunned while it is mixing，and mixed refractory shall be free of any chunks.