The overlay tester : a sensitivity study to improve repeatability and minimize variability in the test results.

Walubita, Lubinda F.; Faruk, Abu N.; Das, Gautam; Tanvir, Hossain A.; Zhang, Jun; Scullion, Tom; Texas Transportation Institute

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The overlay tester : a sensitivity study to improve repeatability and minimize variability in the test results.

2012-02-01
By Walubita, Lubinda F. ; Faruk, Abu N. ; Das, Gautam ; ...

[PDF-4.00 MB]

English

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Alternative Title:

Project title: Search for a test for fracture potential of asphalt mixes
Creators:

Walubita, Lubinda F. ; Faruk, Abu N. ; Das, Gautam ; Tanvir, Hossain A. ; Zhang, Jun ; ... More +

Walubita, Lubinda F. ; Faruk, Abu N. ; Das, Gautam ; Tanvir, Hossain A. ; Zhang, Jun ; Scullion, Tom Less -
Corporate Creators:

Texas Transportation Institute
Corporate Contributors:

Texas. Dept. of Transportation. Research and Technology Implementation Office
Subject/TRT Terms:

[+]

Cracking Hot Mix Asphalt Modulus Overlays (Pavements) Pavement Cracking Pavements, Asphalt--Cracking Pavements--Overlays--Testing--Equipment And Supplies--Evaluation Pavements--Texas--Overlays--Testing Paving Materials Tensile Strength
Publication/ Report Number:

FHWA/TX-12/0-6607-1
Resource Type:

Tech Report
Geographical Coverage:

Texas
Edition:

Technical report; Sept. 2009-Sept. 2011.
Corporate Publisher:

Texas Transportation Institute
Abstract:

Hot mix asphalt (HMA) overlay is one of the most commonly used methods for rehabilitating deteriorated pavements. One major type of distress influencing the life of an overlay is reflective cracking. Many departments of transportation have implemented design-level tests to measure the rutting potential of HMA; these are typically wheel-tracking tests. However, currently, there is no national design-level test for measuring resistance to cracking. Currently, the Texas Department of Transportation uses the Overlay Tester (OT) to evaluate the cracking susceptibility of HMA mixes in the laboratory. While, the OT effectively simulates the reflective cracking mechanism of opening and closing of joints and/or cracks, repeatability and variability in the test results have been major areas of concern. In particular, variability in the OT test results poses a problem with most of the conventional dense-graded HMA mixes, such as Type C and D, which is approximately 75 percent of all the HMA used on Texas highways.

This laboratory study presents a comprehensive sensitivity evaluation of the critical steps of the OT test procedure in an attempt to optimize the OT repeatability and minimize variability in the test results. In general, the study indicated that the sample drying method, glue quantity, number of sample replicates, air voids, sample age at the time of testing, and temperature variations are some of the key aspects that have a significant impact on the OT test repeatability and variability. Overall, findings from this study indicate that variability in the OT test results can be minimized if these aspects are improved and/or more clearly specified in the OT test procedure (Tex-248-F).
Format:

PDF
Funding:

Project 0-6607
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:cc9dba9d3f557b18b34958185b019301165e5ea97ebc063d0022b0e8ed5bb13c
Download URL:

https://rosap.ntl.bts.gov/view/dot/24075/dot_24075_DS1.pdf
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The overlay tester : a sensitivity study to improve repeatability and minimize variability in the test results.

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