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A novel process and apparatus for discharging, on a batch basis, cement and water as a slurry or in the form of separate discharges of slurry and cement, where the materials so discharged contain a predetermined amount of water and a predetermined amount of cement, is disclosed. A major quantity of

A novel process and apparatus for discharging, on a batch basis, cement and water as a slurry or in the form of separate discharges of slurry and cement, where the materials so discharged contain a predetermined amount of water and a predetermined amount of cement, is disclosed. A major quantity of water and all or a major quantity of the cement is mixed in a slurry mixer to produce a primary slurry. A major portion of the primary slurry is then discharged, and the remaining slurry mixed with the remaining quantity of water for discharge as a second slurry. A minor portion of the cement can optionally be added to a dry chamber for discharge therefrom. The slurry mixer and dry chamber, which are substantially closed systems, can be vented together, and then vented to atmosphere, so that air in the slurry mixer which is displaced during water and cement charging flows through the dry chamber. While the normal discharge is from the slurry mixer in slurry form, in situations where the discharge is to be mixed with wet aggregate having a known water content, a minor portion of the predetermined amount of cement required for a concrete mix can be charged in the dry chamber so that it can be separately discharged with the discharge of the slurry from the mixer. The predetermined amount of water and cement for a given batch can be determined by weighing the amount of water and cement separately introduced into the slurry mixer, and in cases where the dry chamber is charged with cement, the weight of cement added to it.

대표청구항 ▼

A process for discharging, on a batch basis, a predetermined amount of water and a predetermined amount of cement as either a water and cement slurry discharge or as a water and cement discharge and a cement discharge, comprising: (a) adding a major quantity of said water and a first major quantity

A process for discharging, on a batch basis, a predetermined amount of water and a predetermined amount of cement as either a water and cement slurry discharge or as a water and cement discharge and a cement discharge, comprising: (a) adding a major quantity of said water and a first major quantity of said cement to a slurry mixer to form a primary slurry, and discharging a major portion of said primary slurry from said mixer; (b) adding the remaining quantity of said water to the remaining quantity of said primary slurry in said mixer to form a secondary slurry, and discharging said secondary slurry from said mixer; (c) optionally adding any remaining quantity of said cement to a dry chamber, and discharging said remaining quantity of said cement from said dry chamber; and (d) venting air displaced in said mixer during the addition of step (a) to atmosphere and venting air displaced in said dry chamber during the addition of step (c) to atmosphere.