Materials, Specifications, and Construction Techniques for Heavy-Duty Flexible Bases: Literature Review and Status Report on Experimental Sections

Hefer, Arno; Scullion, Tom

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Materials, Specifications, and Construction Techniques for Heavy-Duty Flexible Bases: Literature Review and Status Report on Experimental Sections

2005-07-01
By Hefer, Arno ; Scullion, Tom

File Language:

English

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Creators:

Hefer, Arno ; Scullion, Tom
Corporate Creators:

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

Texas Department of Transportation. Research and Technology Implementation Office ; United States. Department of Transportation. Federal Highway Administration
Subject/TRT Terms:

Fine Aggregates Granular Materials Literature Reviews Modulus Of Resilience Pavement Performance Road Construction Soil Stabilization
Publication/ Report Number:

FHWA/TX-03/0-4358-1
Resource Type:

Tech Report
Geographical Coverage:

United States ; Texas
Corporate Publisher:

Texas. Department of Transportation
Abstract:

For the majority of the Texas highways the granular base layer is the main structural component of the pavement system. Project 0-4358 was initiated to provide Texas Department of Transportation (TxDOT) guidelines to improve its base specifications in order to better withstand the demands of future traffic loads. This report provides the results of a literature search and a survey of the performance of experimental heavy-duty base pavements recently constructed in Texas. Base specifications and construction practices from eight United States (U.S.) Department of Transportations (DOTs) and two overseas countries were compared with TxDOT current and proposed specifications. Currently, TxDOT is the only agency that does not control the amount of fines (minus 200 fraction) in its bases. Research studies have indicated that high levels of minus 200 can severely impact both moisture susceptibility and cold weather performance. The newly proposed TxDOT specifications with limits on the fines content are in line with the practices of other agencies in similar climates. The results from three experimental sections on US-281, US-77 and FM-1810 provide several important observations about current base performance. The use of small amounts of stabilizer to upgrade marginal materials does not always guarantee a top-quality base. Better methods of selecting optimal stabilizer content are needed. Furthermore, the flexible bases with high fines content appear to have high initial field stiffnesses that decease rapidly with time.
Format:

PDF
Funding:

0-4358
Collection(s):

US Transportation Collection
Main Document Checksum:

urn:sha-512:f6977008f705ae0cb45a9697f8f4e5a44b7852aa0279633c50c8d068df0afc81e3d5d92ae1d5ef8a1628aec7c8d34c21ddeb3885a43720c7832efea63b3faa65
Download URL:

https://rosap.ntl.bts.gov/view/dot/87721/dot_87721_DS1.pdf
File Type:

[PDF - 18.42 MB ]

File Language:

English

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