Falling Weight Deflectometer (FWD) Calibration Center and Operational Improvements

Irwin, Lynne H.; Orr, David P.; Atkins, Daniel; Cornell University; Cornell Local Roads Program

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Falling Weight Deflectometer (FWD) Calibration Center and Operational Improvements

2011-10-01
By Irwin, Lynne H. ; Orr, David P. ; Atkins, Daniel

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English

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Alternative Title:

Falling Weight Deflectometer Calibration Center and Operational Improvements Falling Weight Deflectometer Calibration Center and Operational Improvements: Redevelopment of the Calibration Protocol and Equipment
Creators:

Irwin, Lynne H. ; Orr, David P. ; Atkins, Daniel

Irwin, Lynne H. ; Orr, David P. ; Atkins, Daniel Less -
Corporate Creators:

Cornell University ; Cornell Local Roads Program

Cornell University ; Cornell Local Roads Program Less -
Corporate Contributors:

United States. Federal Highway Administration. Office of Infrastructure Research and Development
Subject/TRT Terms:

[+]

Backcalculation Calibration Deflection Measurement, Falling Weight Deflectometer Design Design Of Pavements, Railways And Guideways Flexible Pavements FWD Highways Long-term Pavement Performance Program Mechanistic-Empirical Pavement Design Guide Pavement Design Pavement Performance Pavements PDDX Preventive Maintenance Rehabilitation (Maintenance) Research Hub Rigid Pavements Specific Pavement Studies (LTPP)
Publication/ Report Number:

FHWA-HRT-07-040 ; CLRP Report No. 2010-03

FHWA-HRT-07-040 ; CLRP Report No. 2010-03 Less -
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

United States. Federal Highway Administration. ; United States. Federal Highway Administration. Office of Infrastructure Research and Development

United States. Federal Highway Administration. ; United States. Federal Highway Administration. Office of Infrastructure Research and Development Less -
Abstract:

The objective of this project is to upgrade the existing falling weight deflectometer (FWD) calibration system to make calibration sustainable for the next decade without a loss of quality while ensuring that any new procedures are compatible with all brands of FWDs sold in the United States. This involves upgrading the hardware and software used in calibration to take advantage of improvements in technology. The primary result of the FWD calibration procedure is to obtain gain factors used to correct FWD load and deflection sensor data to agree with the calibration instrumentation. Changes incorporated in the new FWD calibration procedure include replacing the reference linear variable differential transducer with an accelerometer for deflection sensor calibration, developing a stiff multiple-sensor stand to allow calibration of all deflection sensors simultaneously, updating the calibration software to a modern programming language with the ability to electronically read data from each brand of FWD, and using modern data acquisition techniques to eliminate sensitivity problems from the older Strategic Highway Research Program FWD calibration protocol. The time to complete an FWD calibration was greatly reduced. This report outlines the updated procedures and provides details about the equipment and methods needed to perform the updated protocol.
Format:

PDF
Funding:

DTFH61-04-C-00041
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:b868cf277cfab28f52da83a26f53bede2d81976a51937beac74ce74cfc69da37
Download URL:

https://rosap.ntl.bts.gov/view/dot/36495/dot_36495_DS1.pdf
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Falling Weight Deflectometer (FWD) Calibration Center and Operational Improvements

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