ASPECTS OF THE INTERPRETATION AND EVALUATION OF FALLING WEIGHT DEFLECTION (FWD) MEASUREMENTS --PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON THE STRUCTURAL DESIGN OF ASPHALT PAVEMENTS HELD DEFLT UNIVERSITY OF TECHNOLOGY, AUGUST 23-26 1982. VOL 1 AND 2. -- NETHERLANDS

In the Netherlands the falling weight deflectometer (fwd) is used more and more for routine evaluation of existing pavements, design of new pavements and investigation of mechanical properties of (new) pavement materials (recycled asphalt, crushed concrete, cement bound crushed asphalt etc). The paper deals with some aspects and problems that may arise with the interpretation of fwd measurements. Subjects like the apparent velocity of the deflection disturbance, the effective layer thickness of the asphalt, the determination of the subsoil modulus, non-linearity and the effect of loose asphalt layers are involved. For this purpose in 1978 a test programme on a number of full-depth flexible pavement structures was started. Afterwards pavements with a bound roadbase (sand cement, slag) and a few with unbound bases (crushed concrete, crushed asphaltic concrete) were included in the test programme. The result obtained on the basis on a linear-elastic multi-layer model were compared with results from surface wave propagation methods and laboratory tests on in situ taken cores. Although further investigations into inertia effects are desirable it can be concluded that falling weight deflection measurements using a (non) linear-elastic multi-layer model provide reliable results for the structural evaluation of pavements.(a) for the covering abstract of the conference see IRRD 815640.

• Corporate Authors:

  INTERNAT EXE COMM. STUDY CENTRE FOR ROAD CONSTR.

  PO BOX 1062
  Ba Arnhem,   Netherlands 
• Authors:
  • Pronk, A C
  • BUITER, R
• Publication Date: 1982

Language

• English

Media Info

• Pagination: p. 461-74
• Serial:
  • Publication of: INTERNAT EXE COMM. STUDY CENTRE FOR ROAD CONSTR.
  • Publisher: INTERNAT EXE COMM. STUDY CENTRE FOR ROAD CONSTR.

Subject/Index Terms

• TRT Terms: Asphalt pavements; Coefficient of subgrade reaction; Conferences; Core samples; Deflection; Deflectometers; Elasticity (Mechanics); Evaluation and assessment; Full-depth asphalt pavements; Measurement; Pavement layers; Thickness; Waves
• Geographic Terms: Netherlands
• Subject Areas: Data and Information Technology; Highways; Pavements; Planning and Forecasting;

Filing Info

• Accession Number: 00482997
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: May 31 1989 12:00AM