United States Department of Transportation
i
Electrical resistivity measurement of mechanically stabilized Earth wall backfill : technical summary.
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2016-06-01
[PDF-894.74 KB]
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Edition:Final report
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Abstract:In Kansas, mechanically stabilized earth (MSE) retaining walls are typically
backfilled with coarse aggregate. Current backfill material testing procedures used
by the Kansas Department of Transportation (KDOT) utilize on-site observations for
construction quality assurance and the American Association of State Highway and
Transportation Officials (AASHTO) Standard T 288-12 (2012), “Standard Method of
Test for Determining Minimum Laboratory Soil Resistivity.” T 288 is designed to test
a soil sample’s electrical resistivity, which correlates to its corrosive potential. The
test, based on material passing through a No. 10 sieve, is considered inappropriate for
coarse aggregates and potentially leads to over-conservative designs. Additionally,
T 288 is run on a sample from the aggregate source, but test results may not capture
variability of the aggregate used in construction. Electrical resistivity imaging (ERI)
provides a two-dimensional (2D) profile of the bulk resistivity of backfill material,
thereby reducing uncertainty regarding backfill uniformity as compared to traditional
sampling.
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