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Specification No . : RGS0024-87 <br /> Part II - SPECIFIC CONDITIONS <br /> Section 11 - Concrete Work <br /> with sufficient thickness to withstand pressure of <br /> newly-placed concrete without bow or defection. <br /> 11 . 5 . 1 . 1 Use plywood complying with U. S . Product Standard PS-1 <br /> "B-B (Concrete Form) Plywood , "Class I , Exterior Grade <br /> or better , mill-oiled and edge-sealed , with each piece <br /> bearing legible inspection trademark. <br /> 11 . 5 . 1 . 2 Forms for Unexposed Finish Concrete : Form concrete <br /> surfaces which will be unexposed in finished structure <br /> with plywood , lumber , or other acceptable material . <br /> Provide lumber dressed on at least 2 edges and one <br /> side for tight fit . <br /> 11 . 5 . 1 . 3 Form Coatings : Provide commercial formulation <br /> Farm-coating compounds that will not bond with , stain <br /> nor adversely affect concrete surfaces and will not <br /> impair subsequent treatments of concrete surfaces . <br /> 11 . 5 . 2 Reinforcing Materials : <br /> 11 . 5 . 2 . 1 Reinforcing Bars : ANSI /ASTM A 615 , deformed bars , <br /> Grade 60 for #6 bars and larger , and Grade 40 for #5 <br /> bars and smaller . <br /> 11 . 5 . 2 . 2 Steel Wire : ANSI/ASTM A82 , plain , cold-drawn , steel . <br /> 11 . 5 . 2 . 3 Welded Wire Mesh : ANSI/ ASTM A 135 , welded steel wire <br /> mesh. <br /> 11 . 5 . 2 . 4 Supports for Reinforcement : Provide supports for <br /> reinforcement including bolsters , chairs , spacers , and <br /> other devices for spacing , supporting , and fastening <br /> reinforcing bars , and welded wire fabric in place . <br /> 11 . 5 . 3 Concrete Materials : <br /> 11 . 5 . 1 Portland Cement : ANSI / ASTM C 150 , 'Type II , unless <br /> otherwise acceptable to Engineer and shall conform to <br /> California Administration Code , Section T22-94303(c ) ( 1 ) . <br /> Use one brand of cement throughout the project , unless <br /> otherwise acceptable to Engineer . <br /> 11 . 5 . 2 Normal Weight Aggregates : ANSI / ASTM C 33 , and as <br /> herein specified . Provide aggregates from a single <br /> source for exposed concrete , l maximum size , and shall <br /> KI-2 <br />