Factors Influencing The Determination Of A Subgrade Resilient Modulus Value
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| Author | : Khaled Ksaibati |
| Publisher | : |
| Total Pages | : 38 |
| Release | : 1993 |
| Genre | : Pavements |
| ISBN | : |
This report describes a study jointly conducted by the University of Wyoming and the Wyoming Department of Transportation to examine the factors influencing the determination of a subgrade resilient modulus value. The objectives of this study were to first, investigate the importance of several fundamental soil properties in determining a design subgrade resilient modulus value; and second, to define the actual relationship between back calculated and laboratory based resilient modulus values for typical cohesive subgrade soils in Wyoming. This study consisted of selecting nine test sites with cohesive subgrade soils in the state of Wyoming, conducting laboratory testing on subgrade cores obtained in 1992 and 1993, determining several fundamental soil properties on these cores, and using deflection data from these nine sites to determine resilient modulus values from three back calculation programs. The data analysis resulted in several important conclusions about factors that influence the selection of a design subgrade resilient modulus value.
| Author | : Mary Stroup-Gardiner |
| Publisher | : ASTM International |
| Total Pages | : 274 |
| Release | : 2003 |
| Genre | : Pavements |
| ISBN | : 0803134614 |
"Resilient modulus indicates the stiffness of a soil under controlled confinement conditions and repeated loading. The test is intended to simulate the stress conditions that occur in the base and subgrade of a pavement system. Resilient modulus has been adopted by the U.S. federal highway administration as the primary performance parameter for pavement design. We thank those who prepared these papers, the reviewers who provided anonymous peer reviews, and those who participated in the symposium. We hope this STP encourages more work to improve the testing standard and the value of the Resilient Modulus test."
| Author | : Richard Ji |
| Publisher | : |
| Total Pages | : 11 |
| Release | : 2014 |
| Genre | : Flexible pavement design |
| ISBN | : |
This paper presents a comparison study of the experimental results from the falling weight deflectometer (FWD) test and laboratory resilient modulus test on granular subgrade materials and its application in flexible pavement design. Field and laboratory testing programs were conducted to develop a practical methodology for estimating resilient modulus (Mr) values of subgrade soils for use in the design of pavement structures. Soil characterization database was established for lab testing. A multiple regression model can be used to predict Mr value using several factors including soil properties, soil type and state of stresses for three popular American Association of State Highway and Transportation Officials (AASHTO) soil types (A-4, A-6, and A-7-6) in Indiana, and these prediction models developed were verified compared with laboratory Mr tests with high R2 value. In situ Mr seasonal variation based on abundant FWD test data in five field testing sites spread in Indiana was conducted in order to find the correlation between resilient modulus, temperature, and precipitation for the period from 2006 to 2012. The proposed method can accurately predict subgrade Mr of lab testing. However results from lab testing are significantly lower than recommended range by mechanistic-empirical pavement design guide (MEPDG) and backcalculation one using an adjust factor of 3. The design examples showed that the seasonal variation of temperature and precipitation as well as traffic can affect the design thickness by as much as 15 to 20 % in general. The findings of this study are expected to be helpful in the implementation of the pavement design in Indiana and elsewhere.
| Author | : Hani Hasan Titi |
| Publisher | : |
| Total Pages | : 316 |
| Release | : 2011 |
| Genre | : Pavements |
| ISBN | : |
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 | : Anand J. Puppala |
| Publisher | : Transportation Research Board |
| Total Pages | : 139 |
| Release | : 2008 |
| Genre | : Technology & Engineering |
| ISBN | : 0309098114 |
At head of title: National Cooperative Highway Research Program.
| Author | : |
| Publisher | : |
| Total Pages | : 786 |
| Release | : 1996 |
| Genre | : Roads |
| ISBN | : |
| Author | : GM. Rowe |
| Publisher | : |
| Total Pages | : 12 |
| Release | : 2003 |
| Genre | : Backcalculation |
| ISBN | : |
Many agencies still use empirical correlations developed to determine design subgrade resilient modulus based on California Bearing Ratio (CBR), R-Value or Soil Support Value (SSV) for pavement design projects. These relationships do not consider the stress dependency of the laboratory determined resilient modulus value. Backcalculated subgrade modulus values from Falling Weight Deflectometer (FWD) tests are also used for this purpose. This study was conducted to determine the relationships between laboratory determined subgrade resilient modulus and the results of Lime Rock Bearing Ratio (LBR) and FWD tests for certain Florida subgrade soils. Laboratory resilient modulus values were determined using subgrade soil samples collected from nine pavement sections. The resilient modulus values were computed by considering stress levels under a standard dual wheel in three typical pavement sections. The roadway sections were selected from various locations in Polk County, Florida. FWD tests were conducted along the selected roadways and LBR tests were conducted on bulk subgrade soil samples. Preliminary relationships to determine design subgrade resilient modulus equivalent to AASHTO Road Test subgrade from FWD and LBR tests were developed for considered typical pavement sections.
| Author | : American Association of State Highway and Transportation Officials |
| Publisher | : AASHTO |
| Total Pages | : 622 |
| Release | : 1993 |
| Genre | : Pavements |
| ISBN | : 1560510552 |
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 | : M. Shabbir Hossain |
| Publisher | : |
| Total Pages | : 32 |
| Release | : 2008 |
| Genre | : Soils |
| ISBN | : |
In 2004, the Guide for the Mechanistic-Empirical Design of New & Rehabilitated Pavement Structures (MEPDG) was developed under NCHRP Project 1-37A to replace the currently used 1993 Guide for Design of Pavement Structures by the American Association of State Highway and Transportation Officials, which has an empirical approach. Implementation of the MEPDG requires the mechanistic characterization of pavement materials and the calibration of performance prediction models by the user agencies. The purpose of this study was (1) to determine the resilient modulus values for Virginia's subgrade soils for input into MEPDG design/analysis efforts, and (2) to investigate the possible correlation of the resilient modulus with other soil properties. Although the MEPDG provides default values and correlations for resilient modulus, they are based on a limited number of tests and may not be applicable for Virginia soils and aggregates. The possible correlation of the resilient modulus with other soil properties was investigated because such correlations could be used for smaller projects where costly and complex resilient modulus testing is not justified. More than 100 soil samples from all over Virginia representing every physiographic region were collected for resilient modulus, soil index properties, standard Proctor, and California Bearing Ratio testing. Resilient modulus values and regression coefficients (k-values) of constitutive models for resilient modulus for typical Virginia soils were successfully computed. There were no statistically significant correlations between the resilient modulus and all other test results, with the exception of those for the quick shear test, for which the correlation was very strong (R2 = 0.98). The study recommends that the Virginia Department of Transportation's Materials Division (1) implement resilient modulus testing for characterizing subgrade soils in MEPDG Level 1 pavement design/analysis, and (2) use the quick shear test to predict the resilient modulus values of fine soils using the relationships developed in this study for MEPDG Level 2 design/analysis
| Author | : |
| Publisher | : |
| Total Pages | : 158 |
| Release | : 2000 |
| Genre | : Roads |
| ISBN | : |
