Structural Value Of Asphalt Treated Permeable Base And Open Graded Asphalt Concrete
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Structural Value Of Asphalt Treated Permeable Base And Open Graded Asphalt Concrete
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Author : R. L. Moore
language : en
Publisher:
Release Date : 1989
Structural Value Of Asphalt Treated Permeable Base And Open Graded Asphalt Concrete written by R. L. Moore and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Pavements, Asphalt concrete categories.
Evaluation Of Cement And Fly Ash Treated Recycled Asphalt Pavement And Aggregates For Base Construction
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Author : Tyson David Rupnow
language : en
Publisher:
Release Date : 2011
Evaluation Of Cement And Fly Ash Treated Recycled Asphalt Pavement And Aggregates For Base Construction written by Tyson David Rupnow and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Cement categories.
The objective of this study was to determine feasibility of cement and fly ash treated recycled asphalt pavement (RAP) and other aggregates as a structural layer for both portland cement concrete and hot mix asphalt pavement systems. A 610 limestone from Kentucky was used as the reference material. Other materials used in the study include: Mexican 610 limestone, gravel and limestone based RAP, and blended calcium sulfate (BCS). Samples were prepared with three cement and fly ash contents and tested for compression and flexural strength. Length changes specimens were also produced and the resilient modulus was measured.
Thickness Design
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Author : Asphalt Institute
language : en
Publisher:
Release Date : 1962
Thickness Design written by Asphalt Institute and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Pavements categories.
Pavement Subbases
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Author : J. A. Crovetti
language : en
Publisher:
Release Date : 1991
Pavement Subbases written by J. A. Crovetti and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Aggregates (Building materials) categories.
This report describes the development of a complete pavement system which incorporates an open graded drainage layer to effectively remove infiltrated water. Candidate materials for use as open graded drainage layers were investigated using laboratory studies of flow characteristics and loading studies to measure accumulated deformations. The research team found that the required hydraulic conductivity of an open graded drainage layer must exceed 1,000 fpd for typical interstate design. For extreme conditions, hydraulic conductivity requirements may approach 5,000 fpd. Two standard Illinois DOT aggregate gradations, CA-7 and CA-11, were found to have hydraulic conductivities in excess of 5,000 fpd. Stability tests conducted on the open graded drainage layers indicate that stabilization with PCC cement or asphalt cement would be required if the materials were to be trafficked prior to final paving. Minimum PCC cement contents of 6% by weight of aggregate are required for adequate stabilization. Minimum asphalt cement contents of 2.5% are required. Observations of open graded drainage layer construction projects were made to document the practicality of construction. These observations indicate open graded drainage layers may be successfully placed if construction equipment specially suited to these materials is used.
Cal Apt Program
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Author :
language : en
Publisher:
Release Date : 1999
Cal Apt Program written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Pavements categories.
This report is the third in a series that describes the results of tests on full-scale pavements at the Richmond Field Station (RFS) which were designed and constructed according to California Department of Transportation (Caltrans) procedures. The report contains a summary of the results and interpretation of the Heavy Vehicle Simulator (HVS) tests on the second of four pavement test sections, an asphalt-concrete section containing an untreated aggregate base, designated Section 501RF. The tests were performed as part of Goal 1 of the CAL/APT Strategic Plan.
Development Of Structural Layer Coefficients For Open Graded Asphalt Emulsion Mixes
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Author : David Russell Hatch
language : en
Publisher:
Release Date : 1977
Development Of Structural Layer Coefficients For Open Graded Asphalt Emulsion Mixes written by David Russell Hatch and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Pavements, Asphalt categories.
This paper describes the development of structural layer coefficients for open graded asphalt emulsion surfacing layers which can be used with the AASHO pavement design method, as modified by the U.S. Forest Service, Region 6. A field survey conducted to document the history, performance and material characteristics of in-service pavements is described and this information together with a survey of experienced users is used to determine the most important factors affecting the design thickness for the pavements. Traffic, base type, temperature and drainage design all are important to determine the pavement thickness. Two procedures used for the development of structural layer coefficients are described. The first procedure uses the information from the performance survey and the AASHO pavement design method to determine appropriate layer coefficients for three in-service roads. The second procedure is a fundamental approach based on layered elastic theory and using information from the field survey. This procedure is useful for the analysis of the pavement in the fully cured or partially cured state. Although a conservative approach was used for both procedures, the developed layer coefficients are greater than the values used in the current design procedure. This indicates that modification of the current values is appropriate. A tabled presentation of layer coefficients is proposed which considers only those factors found to be important for the determination of design thicknesses. The importance of good quality control and specifications is stressed and a listing of current specifications is included.
Integrated Assessment Of Free Draining Base And Subbase Materials Under Flexible Pavement
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Author : Samer Rateb Rabab'ah
language : en
Publisher:
Release Date : 2007
Integrated Assessment Of Free Draining Base And Subbase Materials Under Flexible Pavement written by Samer Rateb Rabab'ah and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Roads categories.
"Providing adequate drainage to a pavement system has been considered as an important design consideration to prevent premature failures due to water related problems such as pumping action, loss of support, and rutting, among others. As a result, permeable bases with drainage efficiency and structural stability characteristics have been widely used by several state DOTs in the design and construction of pavements. The Ohio Department of Transportation (ODOT) has adopted several types of materials specification for use as permeable bases: (a) unbounded base materials including: 308-IA, 307-NJ, and 30-7-CE types, (b) stabilized base materials including: cement and asphalt treated base types. The main objective of this research is to study the performance of different permeable base materials used by the Ohio Department of Transportation (ODOT). Field monitored data combined with laboratory result data are used to determine the drainage efficiency of different permeable base materials used by ODOT. Analysis using Multi-Layer Linear Elastic Analysis (MLEA) and data obtained from field backcalculated resilient modulus are used to predict pavement service life for pavement section with different permeable base materials. To account for effect of environmental factors in pavement design, the Enhanced Integrated Climatic Model was used to predict temperature, moisture and frost depth data at the Project Site, Ohio. Comparisons were made between the predicted and measured moisture contents and temperature along the depth of pavement sections as well as frost depth at different times during the simulation period. Analysis was conducted to study the characterization of permeable base materials in the new Mechanistic-Empirical Pavement Design Guide (MEPDG). Flexible pavement designs and performance derived from the MEPDG approach are compared for different base materials over a range of asphalt concrete layer thicknesses, base materials, subgrade and other material properties. As shown consistently in this study, the impact of unbound materials layer on performance as predicted by the MEPDG methodology is less pronounced than the impact of asphalt concrete layer. Based on the concept of effective stress of unsaturated soils, the matric suction of soil was shown to be an important state variable for predicting moisture-dependent resilient modulus of cohesive soils. A prediction model is proposed and shown to be capable of predicting the resilient modulus of cohesive soils over a range of stress states and water content. The accuracy of the proposed model is validated against experimental data of A-4 and A-6 soils as well as other data available in the literature. Movement of water through the different pavement sections at the project site was modeled by the finite element method (FEM). FEM modeling taking into consideration of both saturated and unsaturated flow appears to be capable of predicting water content regime in pavement layers (base, subbase, and subgrade), as demonstrated in this study when comparing with field moisture monitoring results. Accurate simulation of the boundary and initial conditions, together with representative soil water characteristic curves and the hydraulic conductivity curves for each material, resulted in accurate predictions that match with the measured field results."--Abstract.
Public Roads
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Author :
language : en
Publisher:
Release Date : 1985
Public Roads written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Highway research categories.
Performance Evaluation Of Open Graded Base Course With Doweled And Non Doweled Transverse Joints On Ush 18 151 Sth 29 And Ush 151
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Author : Robert L. Schmitt (Ph.D.)
language : en
Publisher:
Release Date : 2010
Performance Evaluation Of Open Graded Base Course With Doweled And Non Doweled Transverse Joints On Ush 18 151 Sth 29 And Ush 151 written by Robert L. Schmitt (Ph.D.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Pavements, Asphalt concrete categories.
Evaluation Of Porous Pavements For Road Surfaces
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Author : Krey Younger
language : en
Publisher:
Release Date : 1994
Evaluation Of Porous Pavements For Road Surfaces written by Krey Younger and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Pavements categories.