The objective of the project was to outline best practices for the selection of asphalt pavement recycling techniques from the many choices that are available. The report specifically examines cold-in-place recycling (CIR), plain full depth reclamation (FDR), and mill & overlay (MO (2) pavement condition survey; and (3) structural adequacy evaluation. Furthermore, a step-by-step checklist was developed to provide local engineers with a simple and useful tool to follow the decision procedures. The procedure includes selection of rehabilitation method, pavement thickness design, materials mixture design, and construction.
Last. Omar Bouhaddou(UofU: University of Utah)H-Index: 13
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In the evaluation phase, the expert system is tested by comparing the differential diagnosis at each stage of the patient workup with the expert’s opinion and determining where the knowledge base might be revised to improve performance. This process is carried out first. If the system appears to be overconfident about a particular diagnosis (i.e., assigns a higher probability to that diagnosis than the expert thinks appropriate), suspicion is raised that the false positive rate assigned to some ...
(1) Summary The problem considered is that of a symmetrically loaded thin plate of infinite size, resting on the plane surface of a semi-infinite elastic solid. Expressions are obtained for the curvature and normal displacement of the plate with the load concentrated at a point, and for the curvature at the centre of a circular area over which the load is uniformly distributed.
Abstract One method for improvement of distressed pavements is full-depth reclamation (FDR). In this technology, the present asphalt layer is pulverized and mixed with the aggregate layer beneath it and then the mixture is stabilized using a stabilizer agents such as Portland cement in order to increase the strength parameters of the mixture. The aim of this study is to evaluate the laboratory results of stabilizing the blend of reclaimed asphalt pavement (RAP) and aggregates with cement in orde...
State highway agencies are searching for more cost-effective methods for rehabilitating roads. One sustainable solution is full-depth reclamation (FDR), which is a pavement rehabilitation technique that involves pulverizing and reusing materials from existing distressed pavements in place. However, there is little information on the long-term properties of these recycled materials. An important property, the elastic modulus, indicates the structural capacity of pavement materials and is highly r...
Last. Nor Ghani Md Nor(UKM: National University of Malaysia)H-Index: 8
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As quality aggregate sources are depleted, there is a growing importance given to incorporating recycled co-products and waste materials (RCWMs) in new and rehabilitated pavements. An ideal goal would be using recycled materials to create long-lived, well-performing pavement and then being able to use those materials again at the end of their life to create new pavement, thereby effectively achieving a zero-waste highway construction stream. This would not only produce distinct cost advantages, ...
This report presents a summary of pavement preservation activities and recommended uses, expected longevity, and expected pavement life extension. It also includes some basic information intended to be used by those less familiar with pavement preservation, pavement management, life cycle cost analysis, cost estimating, contracting methods and others to help inform and educate in this important aspect of pavement engineering. Tools and techniques are presented to assist local agency engineers in...
#1Ben C. Cox(MSU: Mississippi State University)H-Index: 6
#2Isaac L. Howard(MSU: Mississippi State University)H-Index: 13
Recent economic limitations have fostered increased use of pavement rehabilitation methods such as cold in-place recycling (CIR). CIR could be more appealing to departments of transportation provided variability were lower and performance were more predictable. Because of the nature of the materials and construction processes, CIR is likely to be more variable than plant-mixed asphalt, and it is believed that the performance variability of CIR can be reduced through enhanced density control. The...
Last. Derek Tompkins(UMN: University of Minnesota)H-Index: 6
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Deflection testing and analysis are routinely used to evaluate the spring load capacity of pavements and to design structural overlays. The current falling-weight deflectometer (FWD) deflection analysis process used by the Minnesota Department of Transportation was found to be unreliable. Traditionally, the process used to interpret FWD deflection measurements converted the measured maximum FWD deflection to an equivalent Benkelman beam deflection and compared it with the allowable deflection fo...
#1Luke Johanneck(Minnesota Department of Transportation)H-Index: 4
#2Shongtao Dai(Minnesota Department of Transportation)H-Index: 10
This paper details the construction and analysis of three stabilized full-depth reclamation (SFDR) sections (Cells 2, 3, and 4) constructed at the Minnesota Road Research Facility on I-94 in 2008. Three test sections with different ratios of pulverized asphalt concrete to granular base were constructed, and the performance of full-depth reclaimed pavements stabilized with engineered emulsion was studied. Emulsion content and base structure varied between test sections. Each test section was desi...
#1Ehsan Akhlaghi(IAU: Islamic Azad University)H-Index: 1
#2Farshid Abdi(IAU: Islamic Azad University)H-Index: 8
Rule based expert systems provide a suitable method for capturing expert knowledge and formulating the acquired knowledge as rules. In the field of pavement rehabilitation, the decision making process includes choosing the best rehabilitation or maintenance options according to the values of different pavement conditions and indexes. The decision about the same road pavement may vary significantly from one expert to another because of their different experiences and attitudes. Thus, using an exp...
Full-depth reclamation (FDR) has become an increasingly common technology to restore the service life of pavement structures requiring deep rehabilitation and to stretch available funding for pavement rehabilitation. FDR consists of pulverizing the existing bound flexible pavement layers along with a portion of the unbound layers (or all the unbound layers and a portion of the subgrade); adding a stabilizing agent; compacting the mixture; and surfacing with a new bound material layer(s) or surfa...
