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56. Which of the following statements regarding concrete used as a building material are generally considered to be correct? 1. Commonly composed of water, cement, aggregate, and admixtures 2. Design criteria is established by the American Society of Civil Engineers (ASCE) 3. Concrete strength is normally tested at 28 days 4. Concrete mixes vary by specific use requirements
58. What is the amount of tension that should be applied to the spring balance of the end of a steel tape to yield the proper tension to the 75-ft increment? (Assume the final measurement in the line of tape is 75 ft and the normal 100-foot tape tension is 10 pounds (lbs).)