recalibration of the asphalt layer coefficient

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A Simplified Pavement Design Tool County Engineers-MD

A Simplified Pavement Design Tool Marshall Klinefelter Maryland Asphalt Association Treating Multiple Asphalt Layers Differently . Average values of layer coefficients for materials used in the AASHO Road Test were as follows

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Guidance for Characterization of Existing Asphalt Pavement

A high coefficient means better the drainage and thus a higher structural value is given to the asphalt layer. The screen shot below shows the drainage coefficient factor in the WINPAS program.

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Characterization of Asphalt Drainage Course Layers

Characterization of Asphalt Drainage Course Layers . 5. Report Date August 26, 2010 6. Performing Organization Code BCD No. 060122-1 ; 7. Author(s) L. Allen Cooley, Jr. and Robert S. James . 8. Performing Organization Report No. 9. Performing Organization Name and Address Burns Cooley Dennis, Inc. Post Office Box 12828 ; Jackson, Mississippi 39236 . 10.

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L Allen Cooley Robert S JamesDrainage

Layer Coefficients for NHDOT Pavement Design rip.trb.org

With current use of newer asphalt binder modification technologies, allowance for recycled materials (reclaimed asphalt pavement (RAP), ground tire rubber), and newer manufacturing and construction techniques (such as, cold in-place recycling) there is an urgent need to reevaluate the layer coefficients for materials that are currently being

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Aashto Pavement Design Manual 1993

The report, "Recalibration Procedures for the Structural Asphalt Layer Coefficient in the 1993 AASHTO Pavement Design Guide" (NCAT Report 14-08), outlines. 3.6 AASHTO 1993

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Selection of milling depth for asphalt pavement rehabilitation

Selection of Milling Depth for Asphalt Pavement Rehabilitation Milling of an asphalt concrete (AC) pavement surface refers to the times of the thickness of the remaining milled pavement layer. Based on the mechanistic-empirical analysis procedure, it was found that the structural layer coefficient of the new inlay AC material.

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Rutting in Asphalt Pavement under Heavy Load and High

middle asphalt course layer was the highest in magnitude, under load or temperature. With the combination of the indoor rutting tests on the samples from a corresponding location of the road shoulders, the influence of the high temperature stability of each

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Qisen Zhang Yuliang Chen Xuelian LiRegression analysis Rut China Thermal analysis

allltlHIllll~ iJi~ L l Defense Technical Information Center

layer in a pavement structure, the tendency to of the performance of soft grade AC mixtures in shorten results in a therma 1 stress that produces cold climates (Janoo 1990). Second, we developed

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Influence of Air Voids of Hot Mix Asphalt on Rutting

Asphalt pavements are constructed with two layers of asphalt concrete with initial air voids of 6-8 % depending on the mix type and asphalt layer. Under repeated traffic, the asphalt

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NCAT Pavement Test Track North Dakota Local Technical

NCAT Pavement Test Track 2009 Track Research Findings Layer coefficient recalibration (0.44 0.54) ND Track Update North Dakota Asphalt Conference Author Dr. R. Buzz Powell, PE Assistant Director Test Track Manager, National Center for Asphalt Technology

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Flexible Pavement Structural Number Calculator

Flexible Pavement Structural Number Calculator Calculate the structural number of a flexible pavement with the values of thickness and layer co-efficients of asphalt, base, sub base and additional layers.

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Pavement Design What's My Structural Number?

Since the layer coefficient represents the strength of the material, this is the primary variable that factors in the type of material you plan to use for each layer. For design purposes, layer coefficients are typically determined empirically based on the performance of the material.

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Molecular Simulation of Minerals-Asphalt Interfacial

In this research, the models of four asphalt components (asphaltene, resin, aromatics and saturate) and five minerals were constructed individually, and then the Al2O3-asphalt interface model was constructed by adding the asphalt layer and mineral layer together.

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Development and calibration of shear-based rutting model

affect the prediction of rutting behaviour of asphalt materials. Besides, when adopting resilient modulus of the asphalt mixtures, Monismith et al. (2000) have found, from a full-scale accelerated pavement test (APT), that the depth range of 510 cm in asphalt layer is the critical location where shear deformation occurs most easily.

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Asphalt Mix Basics SlideGur.com

Tanya Nash State Materials Office 1 Asphalt Overview Asphalt CQC (Specs 334 and 337) Miscellaneous Information, Specification Changes, and Research 2 3 1" Friction Course 4" Structural Course 8" Base (Limerock or Asphalt) 12" Stabilized Subgrade 4 Blend of Asphalt binder (6%) Aggregate (94%) Method of Design Hubbard Field (1960's) Marshall (1960's 1998) Superpave

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Mn/ROAD Case Study Using CalBack and CalME Caltrans

included the modulus of the asphalt layer (master curve), fatigue damage to the asphalt layer, and permanent deformation—which are characterized using the flexural frequency sweep test, flexural fatigue test, and repeated

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Borwen Tsai Rongzong Wu John T HarveyRut

Material Layer Coefficients of Unbound Granular Materials

dictive equations for the layer coefficient values (a;) were determined as func tions of the subgrade California bearing ratio, compaction, saturation, and thick ness of asphalt.

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Concrete Paving Session FTBA

Concrete Paving Session February 23, 2010 Greg Schiess 1. 2. 3. CHANGE 4. Recalibration of the national model due to the CTE issue to start in January 2010 26. 1.1 VERSION OF THE SOFTWARE 27. TRAINING FOR THE GUIDE 1" Asphalt Structural Layer 12" Type‐B Stabilized

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Analysis of Full-Depth Reclamation Trial Sections in ia

layers along with a portion of the unbound layers (or all the unbound layers and a portion of the subgrade); adding a stabilizing agent (such as foamed or emulsified asphalt binder, lime, or portland cement); compacting the mixture; and surfacing with a new riding surface layer(s).

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Brian K Diefenderfer Alex K ApeagyeiPortland cement Soil stabilization

Developing a Laboratory Protocol for Asphalt Binder

Developing a Laboratory Protocol for Asphalt Binder Recovery 2014-11-18 The ia Department of Transportation has released a report that compares the rotary evaporator method of asphalt binder extraction and recovery to the Abson method that is currently used in

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THE ECONOMIC VALUE OF PAVEMENT OVERLAY

Existing asphalt pavement with a layer coefficient of 0.3/inch, Asphalt pavement overlay with a layer coefficient of 0.45/inch, Cold-in-place recycled pavement with a layer coefficient of

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Shane Underwood Department of Civil, Construction, and

In the NCDOT procedure, the structural layer coefficient for asphalt concrete (AC) is 0.44 (surface and intermediate mixtures) or 0.30 (base mixtures), while other material types are lower, e.g., the structural layer coefficient for unbound aggregate base materials is 0.14.

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Minnesota LTAP Topics Hot Mix Asphalt Structural Design

Allowing better material tests and characterization—the primary drawback of current procedures is the nebulous layer coefficient. With this approach, it is difficult to quantify and show benefit of improved materials and specifications.

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ANALYSIS OF USING RECLAIMED ASPHALT PAVEMENT

Report No. CDOT-2009-5 Final Report ANALYSIS OF USING RECLAIMED ASPHALT PAVEMENT (RAP) AS A BASE COURSE MATERIAL Robert Locander February 2009

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Design criteria for permeable pavement Minnesota

Note that the size of stone materials used in the reservoir and filter layers differ depending whether the system is pervious concrete, porous asphalt or permeable interlocking concrete pavement. Summary of specifications for materials under the pavement surface.

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