Concrete mixing system with cement/water premixer

An apparatus for mixing cementitious material, liquid, and aggregate material together, including:

• (a) a cementitious material measuring device;
• (b) a screw conveyor including:
• (i) a first tubular housing enclosing a first conveyor screw assembly, said first tubular housing having an inlet in receiving relationship to said measuring device for receiving a quantity of said cementitious material from said measuring device and having first and second outlets, said conveyor screw assembly having different portions for simultaneously moving said cementitious material away from said inlet in diverging directions toward said first and second outlets, and
• (ii) a second tubular housing, substantially parallel to said first tubular housing, enclosing a second conveyor screw assembly, said second tubular housing having spaced first and second inlets connected to said first and second outlets of said first tubular housing and having a further outlet, said second conveyor screw assembly having different portions for simultaneously moving said cementitious material from said first and second inlets in converging directions toward said further outlet;
• (c) liquid introduction means located in said second tubular housing for depositing a quantity of a liquid into said cementitious material as said cementitious material is being moved toward said further outlet so that said liquid and said cementitious material are agitated and mixed together by movement of said second conveyor screw assembly, forming a flowable slurry as said second conveyor screw assembly moves said cementitious material and said liquid toward said further outlet;
• and
• (d) final product mixing chamber means in receiving relationship to said further outlet for receiving a quantity of said flowable slurry emanating from said further outlet and for mixing said slurry with a measured quantity of aggregate material.