... including the design strength of the concrete, the thickness of the concrete chimney shell, the size and position of reinforcing steel, details and dimensions of the chimney lining, and information ... CHAPTER 3 CONSTRUCTION REQUIREMENTS 3.1—General Concrete quality, methods of determining strength of concrete, field tests, concrete proportions and consistency, mixing and placing, and formwork and ... obstruction lighting and marking, and the standards of the Underwriters Laboratories regarding lightning protection and grounding 1.4—Reference standards Standards of the American Concrete Institute,...