SYMPOSIA PAPER Published: 01 January 1989

FWD Backcalculated Moduli Compared with Pavement Pressuremeter Moduli and Cyclic Triaxial Moduli


A relatively new in situ testing device, the pavement pressuremeter (PPMT), was used on three airport pavement subgrades in order to evaluate its usefulness in pavement design and evaluation. Four models which predict the modulus for various stress levels, various strain levels, various loading rates or creep, and repetitive loading were chosen since these loads are all encountered on airport pavements. An airport PPMT test was developed which enabled all four models to be evaluated. The PPMT moduli from the four models were compared with moduli from cyclic triaxial (CT) tests and moduli backcalculated from falling weight deflectometer (FWD) tests. The moduli comparison indicated that the pavement pressuremeter was capable of yielding moduli similar to both the cyclic triaxial and falling weight deflectometer tests. FWD deflections were compared with deflections predicted by inputting PPMT moduli and CT moduli into the finite-element program ILLI-PAVE. The PPMT-predicted deflections compared well with FWD deflections when the model 1/E = α + bϵ was used for clays and the model E = K1(ϴ/pa)K2 was used for sands.

Author Information

Cosentino, PJ
Texas Tech University, Lubbock, TX
Briaud, J-L
Texas A&M University, College Station, TX
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Developed by Committee: D04
Pages: 323–340
DOI: 10.1520/STP19815S
ISBN-EB: 978-0-8031-5087-4
ISBN-13: 978-0-8031-1260-5