Browsing by Author "Milavitz, Rose"

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    Investigation of Performance Requirements of Full-Depth Reclamation Stabilization
    (Center for Transportation Studies, University of Minnesota, 2016-03) Le, Jia-Liang; Marasteanu, Mihai; Milavitz, Rose
    This research investigates the relationship between the mechanical properties of SFDR and the final performance of the rehabilitated pavements. The study involves two computational tools (MEPDG and MnPAVE) for the simulation of the long-term rutting behavior of pavements containing SFDR layers. Based on the simulations of three existing MnROAD cells, it is shown that for MEPDG the SFDR layer is best modeled as a bounded asphalt layer. To further investigate the applicability of MEPDG, a series of laboratory experiments are performed on cores taken from several sites constructed with different stabilizers including engineered emulsion, foamed asphalt with cement and CSS-1 with cement. The experiments include IDT creep and tension, semi-circular bending, dynamic modulus and disc compact tension tests. The measured mechanical properties are inputted into MEPDG to predict the rutting performance of these sites and it is shown that the simulated rut depth agrees well with the site measurement. However, it is found that MEPDG may suffer a convergence issue for some ranges of the values of the mechanical properties of SFDR. Due to this limitation, MnPAVE was used as an alternative. It was shown that the results simulated by MnPAVE are consistent with those obtained by MEDPG. A parametric study was performed on the three sites constructed with SFDR to determine the relationship between the long-term reliability of the rut performance and the mechanical properties of the SFDR.
  • Thumbnail Image
    Item
    Investigation of Performance Requirements of Stabilized Full-Depth Reclamation
    (2016-05) Milavitz, Rose
    Stabilized full-depth reclamation (SFDR) is a pavement rehabilitation method in which distressed asphalt is mixed with a stabilizer to form a base for new asphalt. SFDR has been used in Minnesota but there is a lack of guidelines for its design. This research investigates the relationship between SFDR properties and overall pavement performance, through which the desirable properties of SFDR materials can be determined. Material tests for creep compliance, Poisson’s ratio, tensile strength, dynamic modulus, and fracture energy were performed on SFDR samples from four roadways. The results were used to model the pavements using MEPDG and MnPAVE software. The rutting predictions were compared to the field measurements and parametric analysis was conducted to determine the effect of the dynamic modulus on the lifetime and reliability of the pavement. It was found that MEPDG can accurately predict rutting while MnPAVE is ideal for parametric and reliability analyses of SFDR pavements.
  • Thumbnail Image
    Item
    Pothole Prevention and Innovative Repair
    (Minnesota Department of Transportation, 2018-04) Ghosh, Debaroti; Turos, Mugur; Hartman, Marcella; Milavitz, Rose; Le, Jia-Liang; Marasteanu, Mihai
    Pothole repairs continue to be a major maintenance problem for many highway agencies. There is a critical need for finding long-lasting, cost-effective materials and construction technologies for repairing potholes. This research effort investigates critical components associated with pothole formation and pothole repair and proposes solutions to reduce the occurrence of potholes and increase the durability of pothole repairs. The components include investigating and documenting pavement preservation activities, experimental work on traditional repair materials as well as innovative materials and technologies for pothole repairs, stress analysis of pothole repairs to identify whether certain geometric configurations are more beneficial than others, evaluating cost analyses to determine the effectiveness of various repair methods. A number of conclusions and recommendations were made. Potholes are mainly caused by the delayed response to timely fixing common pavement distresses. The state of Minnesota has a number of preservation strategies that are available and have been successfully used. Recommendations are made to improve these strategies using documents made available as part of new Every Day Counts, EDC-4, initiative. Currently, there are no required specifications for patching materials. Mechanical testing can be used to select patching materials based on the estimated durability of the pothole repair, such as short-, medium-, and long-term. A number of new materials and technologies are available for more durable solutions for winter pothole repairs, however, they require additional heat source and are more expensive.