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Subbase and subgrade performance investigation for concrete pavement.
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2009-05-01
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[PDF-4.54 MB]
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Alternative Title:Project title: Alternatives to asphalt concrete pavement subbases for concrete pavement
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Edition:Technical report; Sept. 2007-Sept. 2008.
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Abstract:Recently, TxDOT has become increasingly aware of the rising cost associated with the use of asphalt
concrete bond breakers to meet the FHWA requirement of using a permanently stabilized, nonerodable
subbase layer below the concrete slab. The main issue associated with this research is if cheaper alternatives
are available for subbase construction. Subbase layers have certain functions that need to be fulfilled (one of
them being constructability) in order to assure adequate pavement performance. One key aspect is resistance
to erosion, and assessment of each of these functions relative to different alternatives is key to understanding
the capability of different alternatives to perform adequately. In this respect, this project is to examine the
design assumptions associated with each alternative and provide recommendations accordingly to include
test methods and material specifications.
This report describes some of the work accomplished summarizing data on subbase performance and
testing relative to concrete pavement subbase and subgrade erosion. Findings from investigations are
discussed to identify factors associated with erosion in the field based on various analysis methods such as
load transfer efficiency (LTE), effective thickness, and ground penetrating radar (GPR). An approach to
mechanistically consider the erosion process is introduced and review of current design procedures was also
conducted as to how they address erosion. This review was extended to address erosion models included in
the literature in terms of the relationship between measurable material properties and performance.
Moreover, previous and current laboratory test methods for erosion testing are summarized and the test
results of selected alternative subbase materials are discussed. Finally, the relation between k-value and slab
behavior is discussed.
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