the binder. The procedures follow those used forhot-mix design (Marshall method), in general, with thefollowing modifications:.Aggregates. Aggregates should be dried to amoisture content expected during construction (up to amaximum of 2 percent, by weight)..Asphalt. Mix selected bitumen with theaggregates, but at the temperature recommended forfield application. The aggregates remain at roomtemperature..Curing. Before compaction, cure the mixture forat least 12 hours in an oven set at 140°F ( + 5°).lCooling. After molding, cool the specimens toroom temperature in the molds. You must take care toremove the specimens, undisturbed and undamaged,from the molds..Testing. Heat the specimens in an oven to 100°( + 2°) and test them in the Marshall machine. Heatingwill normally take about 2 hours.l Selection of the design amount of asphalt. Theasphalt contents at maximum density and maximumstability, after averaging, are used as the design amount.SURFACE AREA METHODOF MIX DESIGNWhen laboratory equipment, except for sieveanalysis, is not available, the following formulas maybe used in place of laboratory procedures to determinethe necessary asphalt content:1.where:P =a=For asphalt cement:P = 0.02a + 0.07b + 0.15c + 0.20dpercent (expressed as a whole number) ofasphalt material by weight of dry aggregatepercent (expressed as a whole number) ofmineral aggregate retained on the No. 50sievepercent (expressed as a whole number) ofmineral aggregate passing the No. 50 andretained on the No. 100 sievepercent (expressed as a whole number) ofmineral aggregate passing the No. 100 andretained on the No. 200 sieved = percent (expressed as a whole number) ofmineral aggregate passing the No. 200 sieveAbsorptive aggregates, such as slag, limerock, vesicularlava, and coral, will require additional asphalt.2.where:P =A =B =C =Q1.b =c=17-22For asphalt emulsion:P = 0.05 A + 0.1 B +percent (expressed as0.5 Ca whole number) byweight of asphalt emulsion, based on weightof graded mineral aggregatepercent (expressed as a whole number) ofmineral aggregate retained on the No. 8 sievepercent (expressed as a whole number) ofmineral aggregate passing the No. 8 sieve andretained on the No. 200 sievepercent (expressed as a whole number) ofmineral aggregate passing the No. 200 sieveQUESTIONSYour battalion has been tasked to replace a5-inch-thick 2,000-square-yard reinforcedconcrete parking lot located at a naval air facilityin northern Japan (extreme exposure). Your jobis to design a concrete mix and determine thetotal quantities of materials needed to completethe project. Based on the parameters listed below,what is the (a) maximum size of the coarseaggregate that you should use, (b) amount ofwater (in gallons) needed for a 1-cubic-yard trialbatch (c) amount of sand (in pounds) needed fora 1-cubic-yard trial batch (d) number of sacks ofType IA cement needed for the project, and (e) theamount (in tons) of coarse aggregate needed forthe project?Average 28-day compressive strength(based on flexural-design strength)Fineness modulus of fine aggregateSpecific gravity of portland cementSpecific gravity offine aggregateSpecific gravity of coarse aggregateDry-rodded weight of coarse aggregateDry-rodded weight of fine aggregateSlump3,500 psi2.63.152.752.65110 lb/cu ft100 lb/cu ft2 in

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