Development of Dynamic Analysis Techniques for Falling-Weight Deflectometer Data

Magnuson, Allen H.; Lytton, Robert L.

i

Development of Dynamic Analysis Techniques for Falling-Weight Deflectometer Data

1997-07-01
By Magnuson, Allen H. ; Lytton, Robert L.

File Language:

English

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Creators:

Magnuson, Allen H. ; Lytton, Robert L.
Corporate Creators:

Texas Transportation Institute. Texas A&M University
Corporate Contributors:

Texas Department of Transportation ; United States. Department of Transportation. Federal Highway Administration
Subject/TRT Terms:

Asphalt Concrete Pavements Backcalculation Data Analysis Falling Weight Deflectometers Pavement Layers
Publication/ Report Number:

FHWA/TX-98/1175-2, Research Report 1175-2
Resource Type:

Tech Report
Geographical Coverage:

United States ; Texas
Edition:

Interim Report
Corporate Publisher:

Texas. Department of Transportation
Abstract:

Results of computations of pavement layer properties are presented for 24 Texas asphaltic concrete (AC) pavement sections. Layer properties were computed using dynamically analyzed Falling-Weight Deflectometer (FWD) time history data. Asphaltic concrete (AC) surface layer creep compliance data, lower layer moduli and subgrade sublayer thicknesses were extracted from the FWD data using a computerized back-calculation process. The Pavement Dynamic Analysis Procedure (PDAP) developed for the project is described. All 24 sections including two pavement sections with known near-surface bedrock were successfully analyzed, giving realistic values for the AC layer creep parameters, lower layer moduli, and lower subgrade layer thickness. A graphical comparison study of pavement deflection frequency response functions is presented. The agreement for the pavements showed what appears to be severe lateral modal vibration interference in the innermost sensors at frequencies between 30 and 80 Hz. Back-calculated layer data were compared with laboratory data from pavement samples. Laboratory creep data of AC layer samples agreed well with back-calculated data. Resonant column data on base course and subgrade moduli were used by highway engineers for pavement performance evaluation and prediction.
Format:

PDF
Funding:

Study No. 0-1175
Collection(s):

US Transportation Collection
Main Document Checksum:

urn:sha-512:a1800b1fdde424dd5e9ee1f0e811f62705107a09b51644759a4e2c9c7419c17182960fce0e07c94a56bc5302fefe23b21ed1c289b0a8086866e8fe8e99e937ac
Download URL:

https://rosap.ntl.bts.gov/view/dot/84930/dot_84930_DS1.pdf
File Type:

[PDF - 69.43 MB ]

File Language:

English

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