It depends on many things, namely: type of subgrade, rainfall, frost penetration, temperature differences, terrain, type and quantity of traffic, pavement design, materials, specifications, and construction. In fact these are the items that should be considered when designing new pavements and overlays of existing pavements. Current technology indicates that properly designed, specified and constructed hot mix asphalt pavements will give 20 years of service prior to the need for an asphalt overlay. Such pavements would be capable of handling the heaviest legal loads with the highest average daily traffic for this period. When overlaid the old pavement becomes an integral part of the new structure which includes the new asphalt surface of varying thickness. Again it is reasonable to expect 20 years service life of this pavement providing the criteria noted in the preceding paragraph is adhered to. Technology from national road tests, simulated laboratory testing, private industry and State research efforts, and studies of in place pavements have been utilized to establish the 20 years life expectancy. The Asphalt Institute, National Asphalt Pavement Association, and The Maryland Asphalt Association advocate the use of Full Depth Asphalt Pavement to attain the long life and the most economical performance from asphalt pavements. These pavements have one big advantage over other flexible pavements which is subgrades remain strong even in the critical thaw part of the year. In fact indications are that subgrades beneath full depth asphalt pavements get stronger in service. At least one of the Associations noted is currently studying in service pavements to determine if 25 years life is feasible design criteria. So, to get full life from your pavement, design your pavement carefully considering subgrade properties, amount and type of traffic, and the materials available. Utilize the lates State Highway Administration Specifications for Materials, Highway, Bridges, and Incidental Structures. Grade, drain, and compact the subgrade carefully so that it will support trucks and construction equipment. Proceed with placing the proper hot mix asphalt courses being sure that specification density and smoothness is incorporated in the construction. One of the main things is to be sure to have a good contractor who has the equipment, personnel, materials, experience, financial responsibility, and expertise to do the job that you want done. The pavements shown in this articles are a few installations from around the State that are giving satisfactory performance. None of them have been resurfaced to date.

  • Corporate Authors:

    Maryland Asphalt Association, Incorporated

    Baltimore Life Building, 901 North Howard Street
    Baltimore, MD  United States  21201
  • Publication Date: 1975-5

Media Info

  • Features: Photos;
  • Pagination: p. 4-5
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00096708
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 15 1975 12:00AM