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Pages 5-21

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From page 5...
... 5   State highway and local agencies have been introduced to BCOAs over the past two decades, with most BCOA projects occurring in the Midwest. As with the adoption of any new pavement technology, an evolutionary process is needed to construct projects and observe the resulting performance, to develop design tools and performance models, and to compile best practices and communicate those to pavement engineers.
From page 6...
... 6 Evaluation of Bonded Concrete Overlays on Asphalt Pavements experiment (Cole 1992; Mack, Cole, and Mohsen 1993) , which many consider the first major experimental BCOA test section.
From page 7...
... Literature Review 7   – Movement of heavy truck loads increases tensile stress at the bottom of the concrete overlay, accelerating crack propagation. – Milling of the asphalt layer before placement of the BCOA layer is one of the best procedures for ensuring the best possible bond.
From page 8...
... 8 Evaluation of Bonded Concrete Overlays on Asphalt Pavements • Guide to Concrete Overlays: Sustainable Solutions for Resurfacing and Rehabilitating Existing Pavements (Harrington and Fick 2014)
From page 9...
... Literature Review 9   2. Coring to verify the quantity (a minimum of 3 in.)
From page 10...
... 10 Evaluation of Bonded Concrete Overlays on Asphalt Pavements evaluation. Project characteristics included traffic loadings from lower-volume interstates to low-volume county roads, whitetopping thickness ranged from 4 to 8 in.
From page 11...
... Literature Review 11   often at low quantities, not the high-modulus synthetic macro fibers and quantities currently in use today. Because of their structural benefit, synthetic macrofibers have primarily been used in BCOAs to reduce the required concrete slab thickness, especially on roadways with elevation constraints (Roesler et al.
From page 12...
... 12 Evaluation of Bonded Concrete Overlays on Asphalt Pavements Work at the University of Minnesota Duluth determined that synthetic macrofibers initially improved LTE, differential displacement, and differential joint energy dissipation for specific fiber types and high dosages (Barman and Hansen 2018)
From page 13...
... Literature Review 13   emphasized coring to confirm the uniformity of asphalt layer thickness and condition. The study referenced a project on Illinois SR-53, which showed heavy signs of distress in locations where the asphalt layer was thinner.
From page 14...
... 14 Evaluation of Bonded Concrete Overlays on Asphalt Pavements Failure Mechanisms Rasmussen et al.
From page 15...
... Literature Review 15   Vandenbossche and Sachs 2013a)
From page 16...
... 16 Evaluation of Bonded Concrete Overlays on Asphalt Pavements (2019) in an evaluation of BCOA projects in the Minnesota highway network, transverse reflective cracking was actually more limited than originally thought.
From page 17...
... Literature Review 17   addition of synthetic macrofibers. The following summarizes aggregates, cement content, and synthetic macrofiber use as related to mix design for BCOAs.
From page 18...
... 18 Evaluation of Bonded Concrete Overlays on Asphalt Pavements proportion of BCOA mixtures can be minimized to achieve the specified strength with a recommended w/cm ratio of 0.40 to 0.42. Synthetic Macrofibers The use of synthetic macrofibers has been shown to improve the performance of thin concrete overlays (Harrington and Fick 2014)
From page 19...
... Literature Review 19   The following step-by-step construction procedures are commonly advised in placement of BCOAs (Vandenbossche and Sachs 2013b; Fick and Harrington 2015)
From page 20...
... Figure 7. Texas DOT standard plan for thin whitetopping at intersections.
From page 21...
... Literature Review 21   cement contents and early failures. More recently, BCOAs have used conventional concrete mixtures with or without synthetic macrofibers.

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