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to StreetPave’s incorrect replication of the Institute’s method. One can see the differences are not trivial, with 37 percent additional asphalt thick- ness. For readers interested in more detail, an in-depth paper concerning this subject has been posted on the Asphalt Institute’s website at www.asphaltinstitute.org. Life Cycle Cost Analysis Module StreetPave also has a life cycle cost analy- sis (LCCA) module that takes the so- called equivalent concrete and asphalt design sections and provides “a detailed cost/benefit analysis” on the two sections. The ACPA promotional literature pro- vides a snapshot of the results for a light- ly traveled residential street as shown in Figure 2 below. 400K 380K 360K 340K 320K 300K 280K 260K 240K 220K FIGURE 1 Input MR 3,000 psi 3000 psi reduced to 1,818.5 psi HMA Thickness 4.6 in. 6.3 in. 37 AI's SW-1 ACPA's StreetPave % Difference The LCCA chart infers that a 6.5 inch thick asphalt residential street will need major rehabilitation after 11 and again 9 years later. If the numbers shown in this LCCA chart are accurate, a 6.5 inch thick asphalt street constructed in 1985 should be nearly a foot thick by now. Common sense and experience with pavement per- formance for many similar lightly traveled residential streets makes such a thick pave- ment highly unlikely and over-designed. 39 FIGURE 2: ACPA’S FALSE STREETPAVE LIFECYCLE COST ANALYSIS MODULE FIGURE 2: ACPA'S STREETPAVE LIFE CYCLE COST ANALYSIS MODULE Residential (ADTT 3 trucks/day, 11,500 ESALs, 2-lane with curbs) initial costs Life Cycle Cost Analysis To design an asphalt pavement, we strongly suggest you use one of the many well-respected and credible asphalt thick- ness design procedures that are available in our industry. We do not recommend using ACPA’s StreetPave for asphalt pave- ment design or LCCA. User beware! Buncher, Blow and Walker are engineers with the Asphalt Institute. 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 Asphalt Concrete PCC subgrade HMAC granular base subgrade OA 10 Winter 2008 Ohio Asphalt <—6"—> <—6.5"—> <—5"—>PDF Image | Porous Asphalt Pavement
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