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Using recycled concrete in MDOT's transportation infrastructure : manual of practice.
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2011-08-01
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[PDF-657.81 KB]
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Abstract:"Crushed concrete aggregate (CCA) is granular material manufactured by removing, crushing, and
processing old concrete for reuse as an aggregate source in new construction. Although the Michigan
Department of Transportation (MDOT) has used CCA since the 1980s, issues in the performance of
some of the early projects currently limit its use to primarily bound and unbound drainable bases beneath
concrete pavements. Some of the performance issues on the early projects developed because of the
unique characteristics and properties of CCA materials, such as increased absorption, lower specific
gravity, and reduced abrasion resistance.
Although there are potentially some limitations associated with the use of CCA, the effective
characterization of these materials during their production and throughout the design and construction
process can help lead to their successful use and application. This document is intended to help guide
MOOT engineers in using CCA in the State's transportation infrastructure, with particular focus on
pavement applications. Information is provided by chapter on the processing and production of CCA, on
the physical, mechanical, and chemical characteristics of CCA, and on the use of CCA in base layers,
asphalt paving layers, and concrete paving layers; these are presented in conjunction with MDOT's
standard specifications for construction and and special provisions to indicate the Department's current
usage policies policies and recommendations regarding CCA."
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