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Author: Zahid Hossain Publisher: ISBN: Category : Correlation Languages : en Pages : 12
Book Description
Resilient modulus (Mr) of subgrade soil is a key input parameter in all three hierarchical levels of the new mechanistic-empirical pavement design guide (MEPDG). A successful implementation of the MEPDG requires a comprehensive evaluation of Mr database(s) for local subgrade soils and its assessment to determine desired input parameters. To this end, a database containing subgrade Mr values, index properties, standard Proctor, and unconfined compressive strengths for 712 soil samples from 39 different counties in Oklahoma was developed. A total of five stress-based regression models were evaluated using a statistical software package ("SPSS," Version 17), and material constants (k1, k2, and k3) for these soils, categorized in accordance with the American Association of State Highway and Transportation Officials Classification system, were determined. The goodness of fit and the significance of these models were ranked with respect to their R2 and F values, respectively; the MEPDG recommended octahedral model was found to outperform the others. Furthermore, reasonably good correlations of material constants with routine soil properties were established for Level 2 analysis and design. Typical Mr values of common Oklahoma soils for Level 3 analysis and design were also estimated. The findings of this study are expected to help the implementation of the MEPDG in Oklahoma.
Author: Zahid Hossain Publisher: ISBN: Category : Correlation Languages : en Pages : 12
Book Description
Resilient modulus (Mr) of subgrade soil is a key input parameter in all three hierarchical levels of the new mechanistic-empirical pavement design guide (MEPDG). A successful implementation of the MEPDG requires a comprehensive evaluation of Mr database(s) for local subgrade soils and its assessment to determine desired input parameters. To this end, a database containing subgrade Mr values, index properties, standard Proctor, and unconfined compressive strengths for 712 soil samples from 39 different counties in Oklahoma was developed. A total of five stress-based regression models were evaluated using a statistical software package ("SPSS," Version 17), and material constants (k1, k2, and k3) for these soils, categorized in accordance with the American Association of State Highway and Transportation Officials Classification system, were determined. The goodness of fit and the significance of these models were ranked with respect to their R2 and F values, respectively; the MEPDG recommended octahedral model was found to outperform the others. Furthermore, reasonably good correlations of material constants with routine soil properties were established for Level 2 analysis and design. Typical Mr values of common Oklahoma soils for Level 3 analysis and design were also estimated. The findings of this study are expected to help the implementation of the MEPDG in Oklahoma.
Author: American Association of State Highway and Transportation Officials Publisher: AASHTO ISBN: 156051423X Category : Pavements Languages : en Pages : 218
Author: Robert L. Mokwa Publisher: ISBN: Category : Pavements Languages : en Pages : 60
Book Description
A key material property used in the mechanistic-empirical pavement design guide (MEPDG) is the resilient modulus (M sub r), which either can be obtained from experimental testing or can be backcalculated from other measured soil properties. The determination of a representative M sub r value for a given subgrade, considering seasonal variations and testing intricacies, is not an easy or straightforward task. Over 30 different correlation equations were reviewed in this study. Selected equations were further examined using data from two Montana Department of Transportation (MDT) soil survey reports. Results from the literature review and preliminary data evaluation indicate there is little to no consistency between equations for predicting M sub r from soil index and classification properties.
Author: Zahid Hossain Publisher: ISBN: Category : Pavements Languages : en Pages : 524
Book Description
"The new mechanistic-empirical pavement design guide (MEPDG), based on the National Cooperative Highway Research Program (NCHRP) study 1-37A, replaces the widely used but more empirical 1993 AASHTO Guide for Design of Pavement Structures. The MEPDG adopted a mechanistic-empirical pavement analysis and design procedure by using material properties, traffic and climate data for local conditions as input. Among material properties, resilient modulus (Mr) of underlying soil and aggregate layers is one of the most important parameters for the analysis and design of flexible pavements. Also, dynamic modulus (E*) of the asphalt mixes and rheological properties of asphalt binders are needed to predict pavement distresses for its design life. To this end, Mr data of 712 samples from five unbound subgrade soils, 139 samples from four stabilized subgrade soils, and 105 samples from two aggregates in Oklahoma were evaluated to develop stress-based models. Among selected models for unbound subgrade soils, the universal model outperformed other stress-based models. For stabilized soils and aggregates, the octahedral model, recommended by the MEPDG, performed better than the other models. Also, reasonably good correlations were established to predict Mr values of these materials by using routine material properties (i.e., gradation, index properties). Furthermore, MEPDG input parameters of three performance grade (PG) binders, collected from three different refineries in Oklahoma, were determined as per Superpave(R) test methods. It was observed that the rheological properties (i.e., viscosity, dynamic shear modulus (G*)) of the same PG grade binders varied significantly based on their sources. The present study is expected to provide ODOT with useful data and correlations that can be used to calibrate the MEPDG for local materials and conditions."--Technical report documentation page
Author: Haithem Soliman Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Laboratory characterization of subgrade soils and unbound granular materials is an essential component of the Mechanistic-Empirical Pavement Design Guide (Pavement ME). The design thickness and performance of a pavement structure are highly dependent on the deformation behaviour of subgrade and granular material. Specifications for granular materials vary among transportation agencies based on the availability of materials, climatic conditions, and function. Specifications aim to provide durable materials that meet design requirements and achieve the target design life with cost effective materials. The objectives of the research are to: • evaluate resilient modulus of typical fine-grained soils under traffic loading. • evaluate resilient modulus, permanent deformation, and permeability of typical unbound granular materials. • evaluate the effect of moisture and fines fraction on the performance of unbound granular materials and subgrade soil. • develop prediction models for resilient modulus to improve reliability of Level 2 inputs in the Pavement ME. • provide test data in support of updating Manitoba Infrastructure and Transportation specifications for unbound granular materials to improve the performance of pavement structures. Resilient modulus tests were conducted on three types of subgrade soil (high plastic clay, sandy clay, and silty sand/sandy silt) at four levels of moisture content. Resilient modulus, permanent deformation and permeability tests were conducted on six gradations representing two types of granular material (100% crushed limestone and gravel) at two levels of moisture content. Prediction models were developed for resilient modulus and compared to the models developed under the Long Term Pavement Performance program. The proposed models provided more reliable predictions with lower root mean square error. The deformation behaviour of the granular materials was classified according to the shakedown and dissipated energy approaches. Among the tested fines contents, limestone and gravel materials with optimum fines contents of 4.5% and 9%, respectively, had better resistance to plastic deformation and higher resilient modulus. The dissipated energy approach can be used to determine the stress ratio for the boundary between post compaction and stable zones from multistage triaxial testing. Result of permeability tests showed that the hydraulic conductivity of unbound granular material increased as the fines content decreased.
Author: Publisher: ISBN: Category : Pavements Languages : en Pages : 235
Book Description
The objective of this project was to determine the resilient moduli for common Missouri subgrade soils and typical unbound granular base materials in accordance with the AASHTO T 307 test method. The results allow Missouri Department of Transportation pavement engineers to calibrate software included with the National Cooperative Highway Research Program Project 1-37A Mechanistic-Empirical Pavement Design Guide according to Missouri's conditions and materials. The test results included resilient moduli data from 27 common subgrade soils out of the 99 Missouri soil associations and from five unbound granular base materials. The subgrade soils, selected and provided by MoDOT, were tested at their optimum water content (as determined from AASHTO T 99 testing (AASHTO, 2001)) and at an elevated water content. The five unbound granular base materials, again selected and provided by MoDOT and representing a typical range in geologic source, were tested at two different gradations (typical as-delivered percent minus #200 sieve size and at an elevated amount of fines). All testing included three replications for all materials. Data are provided in the form of tables and graphs. As a part of the granular base material resilient moduli (Mr) specimen preparation deliberation, MDD and OMC were determined for each of the 10 material/gradation combinations. The Mr testing program results indicate that both the material source and fines content are highly significant in the level of attained resilient modulus. In regard to material source, the range between the highest and lowest Mr values was more than two-fold. Also, two of the five aggregate sources suffered a 15 to 20% loss in Mr with the addition of five percent fines.
Author: Hani Hasan Titi Publisher: ISBN: Category : Pavements Languages : en Pages : 316
Book Description
The objectives of this research are to establish a resilient modulus test results database and to develop correlations for estimating the resilient modulus of Wisconsin fine-grained soils from basic soil properties. A laboratory testing program was conducted on representative Wisconsin fine-grained soils to evaluate their physical and compaction properties. The resilient modulus of the investigated soils was determined from the repeated load triaxial (RLT) test following the AASHTO T307 procedure. The laboratory testing program produced a high-quality and consistent test results database.
Author: American Association of State Highway and Transportation Officials Publisher: AASHTO ISBN: 1560510552 Category : Pavements Languages : en Pages : 622
Book Description
Design related project level pavement management - Economic evaluation of alternative pavement design strategies - Reliability / - Pavement design procedures for new construction or reconstruction : Design requirements - Highway pavement structural design - Low-volume road design / - Pavement design procedures for rehabilitation of existing pavements : Rehabilitation concepts - Guides for field data collection - Rehabilitation methods other than overlay - Rehabilitation methods with overlays / - Mechanistic-empirical design procedures.
Author: Zahid Hossain
Author: Zahid Hossain
Author: American Association of State Highway and Transportation Officials
Author: Robert L. Mokwa
Author: Daehyeon Kim
Author: Zahid Hossain
Author: Haithem Soliman
Author: 
Author: Hani Hasan Titi
Author: 
Author: American Association of State Highway and Transportation Officials