ACI - the American Concrete Institute is an authority and resource for the development, dissemination, and adoption of standards, technical resources, educational & training programs, certification programs, and proven expertise for individuals and organizations involved in concrete design, construction and materials.
National and International organizations producing codes and standards - ANSI, ISO, DIN, BSi and more.
Water vs. cement ratio when mixing concrete.
Estimate required concrete footing volume.
Cement, sand and gravel mixtures.
Properties of normal strength Portland cement concrete.
Estimate required concrete volume per sq. ft.