Performance evaluation of JRCP with stabilized open-graded drainage course.
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2009-08-01
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Alternative Title:Performance evaluation of Jointed-Reinforced Concrete Pavement with stabilized open graded drainage course;Project title: Performance evaluation of JRCP with stabilized open graded drainage course;
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Edition:Final report.
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Abstract:From 1990 to 1995 the department used recycled concrete pavement as open-graded drainage course (OGDC) base
aggregate for thirteen concrete reconstruction projects. Overall, the JRCP projects with coated/stabilized OGDC have
performed very well in contrast to other JRCP concrete projects constructed during that period that used an unbound,
natural aggregate OGDC. The objectives of the joint UM-MDOT investigation was to determine whether the superior
joint performance of JRCP projects on treated OGDC was tied to the OGDC stabilization, and whether those findings are
transferable to current JPCP designs to benefit their long-term performance. The study included two JPCP projects
(SHRP 260221 and 260223) on permeable asphalt-treated base (PATB).
Excellent long-term (>10 years) dowel-bar load transfer effectiveness was common. Pavement distress index curves
showed little or no distress development with no upward trend. This is directly attributed to stable and uniform base
support. Excellent long-term joint load transfer effectiveness (>85%) was found as well for the two JPCP SHRP test
sections. A key factor in achieving excellent long-term performance is controlling base erosion and joint settlement by
providing an adequate drainage system. In some cases, extensive base erosion and joint settlement of 0.10-0.2 inches
from inadequate subsurface drainage lead to ineffective dowel-bar load transfer and mid-slab top-down cracking. In
view of the varied performance that MDOT has experienced with JRCP/JPCP on untreated OGDC it is therefore
recommended that MDOT use treated OGDC as the standard base, especially since the incorporation of crushed concrete
pavement into the base provides long-term sustainability. However, the full, long-term benefits of using a treated OGDC
are contingent on a well-draining pavement system.
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