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Accelerated loading evaluation of stabilized BCS layers in pavement performance : tech summary.
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2012-03-01
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[PDF-145.56 KB]
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Abstract:The Louisiana Department of Transportation and Development (LADOTD) began to use blended calcium sulfate (BCS) as
an alternative base material in the 1990s. Raw BCS base without further chemical stabilization can achieve relatively high
strength and stiff ness under a dry environment. However, it is associated with severe moisture susceptibility problems
under a wet environment. Extra moisture in BCS can cause both short-term construction diffi culties and long-term
performance problems. A previously completed laboratory study conducted at the Louisiana Transportation Research
Center (LTRC) indicated that chemically stabilized BCS using a grade 120 granulated ground blast furnace slag with or
without some secondary stabilizers (e.g., Type I portland cement, lime, or Class C fl y ash) can achieve a signifi cantly
better performance than raw BCS materials in terms of both water resistance and lab-determined compressive strength.
In order to verify the effi ciency of laboratory derived BCS stabilization schemes and evaluate related fi eld performance
and economic benefi ts, an accelerated pavement testing (APT) experiment was initiated.
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