Author: José R. MontalvoPublisher:
ISBN:
Category : Pavements
Languages : en
Pages :
Book Description
Application of Resilient Modulus Test Equipment and Procedures for Subgrade Soils
Author: José R. MontalvoPublisher:
ISBN:
Category : Pavements
Languages : en
Pages :
Book Description
Resilient Modulus Testing for Pavement Components
Author: Mary Stroup-GardinerPublisher: ASTM International
ISBN: 0803134614
Category : Pavements
Languages : en
Pages : 274
Book Description
"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."
Simplification of Resilient Modulus Testing for Subgrades
Author: Daehyeon KimPublisher:
ISBN: 9781622601875
Category :
Languages : en
Pages :
Book Description
Resilient Modulus Test Reproducibility Study
Author: California. Office of Transportation LaboratoryPublisher:
ISBN:
Category : Soil mechanics
Languages : en
Pages : 42
Book Description
Laboratory Determination of Resilient Modulus of Missouri Subgrade Soils
Author: Estimating Stiffness of Subgrade and Unbound Materials for Pavement Design
Author: Anand J. PuppalaPublisher: Transportation Research Board
ISBN: 0309098114
Category : Technology & Engineering
Languages : en
Pages : 139
Book Description
At head of title: National Cooperative Highway Research Program.
Estimation of Subgrade Soils Resilient Modulus from In-situ Devices Test Results
Author: Louay N. MohammadPublisher:
ISBN:
Category : Geogauge
Languages : en
Pages : 9
Book Description
Field and laboratory testing programs were conducted to develop resilient modulus prediction models for application in the design and evaluation procedures of pavement structures. The field testing program included conducting several in-situ tests such as Geogauge, Light Falling Weight Deflectometer, and Dynamic Cone Penetrometer (DCP). The laboratory program consisted of performing repeated load triaxial resilient modulus tests, physical properties, and compaction tests on soil samples obtained from tested sections. A total of four subgrade soil types at different moisture-dry unit weight levels were considered. Comprehensive statistical analyses were conducted on the field and laboratory test results. Two sets of models were developed. The first set (direct model) directly relates the laboratory measured resilient modulus values with the results of each of the three in-situ devices, whereas the second set (soil property model) incorporates soil properties in addition to the results of each of the three in-situ devices. A good agreement was observed between the predicted and measured values of the resilient modulus. Furthermore, the results showed that the resilient modulus prediction was enhanced when the soil properties were included as variables within the models. Among the models developed, the DCP-soil property model had the best prediction of resilient modulus followed by the DCP-direct model. The effectiveness of the DCP models were further evaluated during a forensic analysis of pavement section failure in a highway within Louisiana.
Resilient Properties of Colorado Soils
Author: Shan-Tai YehPublisher:
ISBN:
Category : Pavements
Languages : en
Pages : 84
Book Description
During the past 30 years, pavement engineers have increasingly used the elastic layered system theory to predict the physical response of pavement structures in order to determine a proper pavement thickness. The 1986 AASHTO Guide for Design of Pavement Structures has adopted resilient properties in its pavement design. The committee for this Guide recognized that many state highway agencies do not have the proper equipment to determine the resilient modulus. In the Design Guide, correlation of the resilient modulus with the California bearing ratio and the R-value are given. However, these correlations are general in nature and can be used temporarily and only for certain types of soils. The committee has recommended that states develop their own correlations. During this research study, attempts were made to find a correlation between the resilient modulus and the R-value for Colorado soils. To accomplish this task, an extensive laboratory testing program was conducted and the following correlation was established: resilient modulus equals 3500 plus 125 times the R-value. Based on the results of this study, this correlation was established for Colorado soils. Verification of this correlation by additional tests on high quality subgrade (i.e., A-1-b or better) will be needed. After verification, attempts will be made to incorporate this finding in the current CDOH Pavement Design Procedures.
Resilient Modulus of Subgrade Soils Using Gyratory Testing Machine
Author: K. P. GeorgePublisher:
ISBN:
Category : FREDD1 (Computer program)
Languages : en
Pages : 95
Book Description
Correlation Between Resilient Modulus (MR) of Soil, Light Weight Deflectometer (LWD), and Falling Weight Deflectometer (FWD)
Author: Sung Soo ParkPublisher:
ISBN: 9781622605002
Category :
Languages : en
Pages :
Book Description
INDOT adopted the Mechanistic-Empirical Pavement Design Guide (MEPDG) beginning January 1, 2009, which is based on the FHWA Long Term Pavement Performance (LTTP) field study. The resilient modulus of the soil, MR, is required to implement the new design guide, as well as the pavement input parameters. The soil resilient modulus test requires special, expensive, equipment, significant time investment and effort, which has led researchers to develop MR prediction models and alternative methods to estimate the resilient modulus using non-destructive tests such as Falling Weight Deflectometer, FWD, Light Weight Deflectometer, LWD, and Dynamic Cone Penetrometer, DCP. The objectives of the project are geared toward a practical approach for pavement design procedures to effectively determine the soil resilient modulus for rehabilitation projects, targeting specifically untreated subgrade soils type A-6 and A-7-6. A total of four sites in Indiana were selected to conduct FWD, LWD, and DCP tests, as well as resilient modulus tests in the laboratory. In addition to the output from the four sites, additional data were collected from the data repository of INDOT which has geotechnical and pavement information. Extensive analysis and comparisons were done in an attempt at establishing relationships between the field tests and the laboratory results. The study showed the following: (1) High quality FWD tests conducted on top of the pavement can be used to estimate the subgrade MR, as long as site conditions and pavement layers thickness are well known; (2) the results of FWD tests on top of the subgrade are not reliable, as they are affected by the low confinement of the soils; and (3) LWD and DCP tests can be used to provide and assessment of the quality and uniformity of the subgrade, but do not provide reliable estimates of the stiffness of the subgrade.