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Specification No . : RGS0024-87 <br /> PART II - SPECIFIC CONDITIONS <br /> Section 12 - Portland Cement <br /> Concrete Paving <br /> 12 . 6 . 2 Welded Wire Mesh : Welded plain cold-drawn steel wire <br /> fabric , ASTM A 185 . <br /> 12 . 6 . 3 Reinforcing Bars : Deformed steel bars , ASTM A615 , Grade <br /> 40 . <br /> 12 . 6 . 4 Joint Dowel Bars : Plain steel bars , ASTM A 615 , Grade <br /> 40 . Cut bars true to length with ends square and free <br /> of burrs . <br /> 12 . 6 . 5 Metal Expansion Caps : Furnish for one end of each dowel <br /> bar in expansion joints . Design caps with one end <br /> closed and a minimum length of 3 " to allow bars <br /> movement of not less than 1 " , unless otherwise <br /> indicated . <br /> 12 . 6 . 6 Concrete Materials : Comply with requirements of Section <br /> 11 for concrete materials , admixtures , bonding <br /> materials , curing materials , and others as required . <br /> 12 . 6 . 7 Expansion Joint Materials : 3 / 8 " cane fiber asphalt <br /> impregnated . <br /> 12 . 6 . 8 Base Course Materials : Comply with requirements of <br /> Section 11 for aggregate fill and base materials . <br /> 12 . 7 Concrete Mix, Design, and Testing : <br /> Comply with requirements of applicable Division 3 sections <br /> for concrete mix design , sampling and testing , and quality <br /> control , and as herein specified . Design mix to produce <br /> normal -weight concrete consisting of portland cement , <br /> aggregate , water - reducing admixture , air - entraining <br /> admixture and water to produce the following properties . <br /> 12 . 7 . 1 Compressive Strength : 2 , 500 psi , minimum at 28 days . <br /> 12 . 7 . 2 Slump Range : 4-1 /2" maximum. <br /> 12 . 8 Surface Preparation : <br /> Remove loose material from compacted subbase surface <br /> immediately before placing base materials and concrete . <br /> Proof-roll prepared subbase surface to check for unstable <br /> areas and need for additional compaction . Do not begin <br /> XII-2 <br />