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PAVEMENT DESIGN WITH THE PAVEMENT PRESSUREMETER . PRESSUREMETERS. PROCEEDINGS OF THE THIRD INTERNATIONAL SYMPOSIUM, ORGANISED BY THE BRITISH GEOTECHNICAL SOCIETY, OXFORD UNIVERSITY, APRIL 2-6, 1990

This article presents a current review of the use of pressuremeter for pavement design. The pavement pressuremeter was first developed for Transport Canada. The instrument was improved by Roctest in 1984 and sold under the name of PENCEL. This unit consists of a probe and tubing and a small suitcase housing the control unit. The probe is 35 mm in diameter and the inflatable length is 230 mm. For new pavements the hole is made with a small flight auger 35 mm in diameter. For evaluation of an existing pavement a 50 mm diameter hole is first opened through the surface course. This is usually done with a concrete drill and the resulting core can be used for determining the modulus of the surface course. The test itself consists of inflating the probe in a specific sequence, and takes about 10 minutes. Details are provided of this sequence and on how to obtain the modulus E from the unload-reload loop on the pressuremeter curve, and the limit pressure by manual extension of this pressuremeter curve. Details are also provided of the results of tests performed using this equipment on 3 airports in Texas; College Station, San Antonio, and Possum Kingdom. The results were compared with those obtained by cyclic triaxial tests and falling weight deflectometer tests. The moduli and moduli parameters obtained from the pressuremeter and the cyclic triaxial tests were used in a multilayer elastic program to predict the deflection of the pavement under falling weight deflectometer load. In each layer the modulus was chosen to correspond to the anticipated stress and strain level. For the concrete and asphalt layers the conventional modulus values were input. The deflections were predicted for the three airports and for each load level using the falling deflectometer test. Comparisons with the measured deflections are presented, and show that in sand the main factor influencing the modulus is the stress level, while in clay it is the strain level. The results also show that the PENCEL apparatus itself can give proper layer moduli to calculate small pavement deflections. It can also help in the load rating of existing pavements. (TRRL)

  • Availability:
  • Corporate Authors:

    Thomas Telford Limited

    London,   United Kingdom 
  • Authors:
    • Briaud, J L
    • Cosentino, P J
  • Publication Date: 1990

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Filing Info

  • Accession Number: 00619892
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-7277-1556-9
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1992 12:00AM