| http://www.w3.org/ns/prov#value | - In addition, pH control agents (221) are added to this mixer in the form of one or more of group of alkaline materials such as calcium oxide, calcium hydroxide, potassium hydroxide, or other metal oxides or metal hydroxides, anhydrous ammonia, cement kiln dust, lime kiln dust, fluidized bed ash, Class C fly ash and Class F fly ash addition to raise the pH of the mix.
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