Improving the accuracy and usability of Iowa falling weight deflectometer data.

Ceylan, Halil; Gopalakrishnan, Kasthurirangan; Kim, Sunghwan; Iowa State University. Institute for Transportation

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Improving the accuracy and usability of Iowa falling weight deflectometer data.

2013-05-01
By Ceylan, Halil ; Gopalakrishnan, Kasthurirangan ; Kim, Sunghwan

[PDF-2.85 MB]

English

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Details:

Creators:

Ceylan, Halil ; Gopalakrishnan, Kasthurirangan ; Kim, Sunghwan

Ceylan, Halil ; Gopalakrishnan, Kasthurirangan ; Kim, Sunghwan Less -
Corporate Creators:

Iowa State University. Institute for Transportation
Corporate Contributors:

United States. Federal Highway Administration
Subject/TRT Terms:

[+]

Accuracy Asset Management Backcalculation Falling Weight Deflectometers Hot Mix Paving Mixtures Overlays (Pavements) Pavement Layers Portland Cement Concrete Software
Publication/ Report Number:

InTrans Project 11-415
Resource Type:

Tech Report
Geographical Coverage:

Iowa
Corporate Publisher:

Iowa. Dept. of Transportation
NTL Classification:

NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance
Abstract:

This study aims to improve the accuracy and usability of Iowa Falling Weight Deflectometer (FWD) data by incorporating significant

enhancements into the fully-automated software system for rapid processing of the FWD data. These enhancements include: (1) refined

prediction of backcalculated pavement layer modulus through deflection basin matching/optimization, (2) temperature correction of

backcalculated Hot-Mix Asphalt (HMA) layer modulus, (3) computation of 1993 AASHTO design guide related effective SN (SNeff)

and effective k-value (keff ), (4) computation of Iowa DOT asphalt concrete (AC) overlay design related Structural Rating (SR) and kvalue

(k), and (5) enhancement of user-friendliness of input and output from the software tool. A high-quality, easy-to-use

backcalculation software package, referred to as, I-BACK: the Iowa Pavement Backcalculation Software, was developed to achieve the

project goals and requirements. This report presents theoretical background behind the incorporated enhancements as well as guidance

on the use of I-BACK developed in this study. The developed tool, I-BACK, provides more fine-tuned ANN pavement backcalculation

results by implementation of deflection basin matching optimizer for conventional flexible, full-depth, rigid, and composite pavements.

Implementation of this tool within Iowa DOT will facilitate accurate pavement structural evaluation and rehabilitation designs for

pavement/asset management purposes. This research has also set the framework for the development of a simplified FWD deflection

based HMA overlay design procedure which is one of the recommended areas for future research.
Format:

PDF
Funding:

SPR 90-00-RB04-012
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:2c21683d86fe0305c37c76f325d4d84f4d8bd19f573f58e6938a4180af0e8f07
Download URL:

https://rosap.ntl.bts.gov/view/dot/26282/dot_26282_DS1.pdf
File Type:

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Improving the accuracy and usability of Iowa falling weight deflectometer data.

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