THE successful and economical use of concreteinvolves the selection of suitable materials, thecorrect proportioning of mixtures in the developmentof qualities to meet specific requirements, theproper placing and the care of the green concrete.

A concrete of great strength is uneconomical if aweaker mixture will serve and a cheap or weak concreteis costly if it does not fulfill all requirements.The cost of concrete depends not only upon the priceof the materials and labor but also upon the judicioususe of the two. Lack of foresight in locatingthe mixing plant, in the design of forms, and inplanning the successive operations may cause unnecessaryexpense, while neglect of any one of theprecautions which should be observed is likely toresult in unsatisfactory work.

The bulletin discusses the requirements of goodconcrete and describes the making and placing ofplain concrete according to the best practice.