Compute Bituminous MaterialSeveral methods are used to calculate the amount ofhot-mix material required for paving projects; however,when the weight of a hot-mix per square yard or cubicfoot is not known, two equations are used in the NCF tocompute the number of tons of asphalt required for aproject. These equations are as follows:Equation 1= Percent of Tons + Tons = Tons RequiredWhere:L = length of project in feetW = width of project in feetD = depth or thickness of compacted mat. Youmust change inches into feet by dividingthe number of inches by 12 (inches in 1foot). For paver screed height, add 1/8inch for each inch of the mat to be paved.(Example: for a 2-inch mat, two blocks ofwood 2 1/4 inch thick will be required toset under the screed.) The blocks must bethicker than the finished compacted matto allow for additional compaction byrollers146 = This number represents the approximateweight of 1 cubic foot of compactedhot-mix asphalt. This number can varyfrom 140 to 160 pounds; however,146 pounds equals the 110 pounds persquare yard per 1-inch depth of asphaltused in the second equation for figuringtons require for asphalt. (See table 8-5.)WF = Waste factor equals 5% or .05, or 10% or.10, depending on the experience of thescreed operators and handwork requiredon the project2,000 = 2,000 pounds is equal to one ton;therefore, you must divide the totalweight of material by 2,000, giving tonsrequired.8-31

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