LIFE-CYCLE PERFORMANCE - cimlinepmg.com

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16 ASPHALTSUMMER 1999By Dr. Bob Boyer, Asphalt Institute SeniorDistrict Engineer and Jay Hensley, AsphaltInstitute Chief EngineerThe Asphalt Institute s LIFE-CYCLE perfor-mance program now has and is devel-oping a database to store and analyze LIFE-CYCLE PERFORMANCE data and make it avail-able to user agencies. So far, surveyresults show that asphalt pavements areperforming better than previously Climatic ConditionsThe program uses five climatic condi-tions wet freeze, wet no-freeze, dryfreeze, dry no-freeze, or all climatic con-ditions. The traffic, or functional, classi-fication is divided into six differentclasses. Class 1 represents the basicresidential street. The classification pro-gresses upward to Class VI, which isheavy interstate. The constructionlevel is composed of new, rehabilita-tion, or both. Fifty-four service lifeequations can be developed from thedata using the various traffic, construc-tion and climatic conditions for a PCRof service life equations showthat asphalt pavements are not onlyperforming according to design life ,which is normally 20 years, but can bemaintained longer with routine mainte-nance, which may include crack pour-ing, surface treatments, milling andoverlays of nominal aggregate is not normally thoughtto add structural value to the pave-ment, but merely to restore surface forrideability, safety and environmentalprotection from the DifferencePreliminary data also indicates a signifi-cant difference in pavement

SUMMER 1999 ASPHALT 17 could contribute to a wider band in the performance curve. The Institute’s traffic classifications are presented in Table 2. All facilities were placed into

  Performance, Life, Cycle, Life cycle performance