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ADDENDUM #1 <br />Table 334-1 <br />HMA Mix Types <br />Asphalt Work Category <br />Mix Types") <br />Traffic Level <br />1 <br />Type SP -9.5 <br />A <br />2 <br />Structural Mixes: Types SP - <br />9.5 or SP -12.5 <br />Friction Mixes: Types FC -9.5 <br />or FC -12.5 <br />BorC <br />3 <br />Structural Mixes: Types SP - <br />9.5 or SP -12.5 <br />Friction Mixes: Types FC -9.5 <br />or FC -12.5 <br />C <br />(1) Equivalent mixes may be approved as determined by the Engineer <br />A Type SP or FC mix one traffic level higher than the traffic level specified in the <br />Contract may be substituted, at no additional cost (i.e. Traffic Level B may be substituted for Traffic <br />Level A, etc.). Traffic levels are as defined in section 334 of the Department's Standard <br />Specifications for Road and Bridge Construction. <br />334-1.4 Gradation Classification: HMA mixes are classified as either coarse or fine, <br />depending on the overall gradation of the mixture. Coarse and fine mixes are defined in 334-3.2.2. <br />Use only fine mixes. <br />The equivalent AASHTO nominal maximum aggregate size Superpave mixes are as <br />follows: <br />Type SP -9.5, FC -9.5 9.5 mm <br />Type SP -12.5, FC -12.5 12.5 mm <br />334-1.5 Thickness: The total pavement thickness of the HMA Pavement will be based on a <br />specified spread rate or plan thickness as shown in the Contract Documents. Before paving, propose <br />a spread rate or thickness for each individual layer meeting the requirements of this specification, <br />which when combined with other layers (as applicable) will equal the plan spread rate or thickness. <br />When the total pavement thickness is specified as plan thickness, the plan thickness and individual <br />layer thickness will be converted to spread rate using the following equation: <br />where: <br />Spread rate (lbs/yd2) = t x Grim x 43.3 <br />t = Thickness (in.) (Plan thickness or individual layer thickness) <br />= Maximum specific gravity from the mix design <br />For target purposes only, spread rate calculations shall be rounded to the nearest whole <br />number. <br />334-1.5.1 Layer Thicknesses: Unless otherwise called for in the Contract <br />Documents, the allowable layer thicknesses for HMA mixtures are as follows: <br />Type SP -9.5, FC -9.5 3/4 - 1 1/2 inches <br />Type SP -12.5, FC -12.5 1 1/2 - 2 1/2 inches <br />334-1.5.2 Additional Requirements: The following requirements also apply to <br />HMA mixtures: <br />01025-35 Technical Specifications <br />F \Public Works\ENGINEERING DIVISION PROJECTS\1205-Vero Lake Estates Swk-87th St 101st Ave to CR510 <br />iLAP)\Admim\ADDENDUMS\ADDENDUM 1\Technical Specifications Addendum #1 doc <br />