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The code of the city of Charlottesville, Virginia :

the charter as amended and the general ordinances of the city enacted as a whole June 6th, 1932, in effect July 15th, 1932
  
  

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Sec. 494(17). Concrete construction.

Concrete for reinforced concrete construction shall consist of
a wet mixture of one part of Portland Cement to not more than
six parts of aggregate, fine and coarse, in such proportions as
to produce the greatest density.

The quality of the materials, the design, and the construction
shall be in accordance with the best engineering practice.