“Stripping of Forms (Minimum Waiting Period After Placing Concrete) Average Temperatures Structural Member Above 60°F. 500-60°F, jess than *Bottom forms of OvF. slabs spanning 6 feet or less 5 days 9 days 14 days girders and beams 14 days 18 days 21 days Bottom forms of za. *For slab spans more than 6 feet add 12 hours for each additional foot over 6 feet. (Except roof slabs - see paragraph 3. below.) 3. StrippingRoof Forms: Roof section forms shall not be stripped until concrete has developed & compressive strength of not less than 2000 pounds per square inch. One or more test cylinders, as desired, shall be taken of each roof section poured. Cylinders shall be tested in compliance with paragraph 5-07 e. preceeding, or as specifeid by the Engineer. 4, Filling Tie-Rod or Bolt Holes: Holes remaining from bolts or the tie rods shall be filled solid with cement mortar. Holes passing entirely through the wall shall be filled from inside face with a device that will force the mortar through to the outside face using a stop held at the outside wall surface to ensure complete filling. Holes which do not pass entirely through the walls shall be packed thoroughly full. All excess mortar at the face of filled holes shall be struck off flush. 5-27. REINFORCING STEEL: &. General: The reinforcing, fabricated to shapes and dimensions shown, shall be placed where indicated on drawings or reasonably required to carry out the intent of the drawings and specifications. Before placing, all reinforcement shall be thoroughly cleaned of rust, miil scale or coatings, which would reduce or destroy the bond. Reinforcement appreciably reduced in section shall not be used. Following any substantial delay in the work, previoualy placed reinforcement, left for future bonding, shall be 5-19