Author: Kee Yong FooPublisher:
ISBN:
Category : Pavements, Flexible
Languages : en
Pages : 286
Book Description
Simplification of the Subgrade Resilient Modulus Test (AASHTO T-274)
Author: Kee Yong FooPublisher:
ISBN:
Category : Pavements, Flexible
Languages : en
Pages : 286
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."
Evaluation of Procedure to Estimate Subgrade Resilient Modulus for Use in Pavement Structural Design
Author: Harold L. Von QuintusPublisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 54
Book Description
The Kansas Department of Transportation (DOT) uses the 1993 DARWin version of the 1986 AASHTO Guide to design rigid and flexible pavements. One of the inputs needed for the flexible pavement design procedure is the modulus of the subgrade soils, which has an effect on the total pavement thickness. Different procedures can be used to estimate the effective roadbed resilient modulus for flexible pavement design and effective modulus of subgrade reaction for rigid pavement design. As part of the study entitled Determination of the Appropriate Use of Pavement Surface History in the KDOT Life-Cycle Cost Analysis Process, an evaluation of the procedure that Kansas DOT uses to estimate the effective subgrade resilient modulus was completed. This report provides the results of that evaluation.
Resilient Modulus for New Hampshire Subgrade Soils for Use in Mechanistic AASHTO Design
Author: A Simplified Mechanistic Rut Depth Prediction Procedure for Low-volume Roads
Author: Kashyapa A. S. YapaPublisher:
ISBN:
Category : LOADRATE (Computer program)
Languages : en
Pages : 156
Book Description
In this study, a procedure for predicting the number of passes of a wheel load that will cause a specified rut depth is developed, using information which includes the base layer thickness, the resilient moduli and general classification of the granular base course and the subgrade soils. The procedure is mechanistic but simple, and is based on the permanent deformation characteristics of various types of soils determined in the laboratory and also from test results published by other researchers. Resilient moduli of pavement material layers are obtained from the results of non destructive testing techniques. The validity of predictions of a number of these techniques is verified by comparing them with laboratory test results. Parametric runs were made using the Mechano lattice program to form a database of rut depths.
Transportation Research Record
Author: Subgrade Resilient Modulus Evaluation
Author: Steve ValdezPublisher:
ISBN:
Category : Pavements
Languages : en
Pages : 134
Book Description
Highway Research Abstracts
Author: Traffic and Transportation Studies
Author: Publisher:
ISBN:
Category : Communication and traffic
Languages : en
Pages : 1022
Book Description
Estimation of Subgrade Resilient Modulus Using the Unconfined Compression Test
Author: Shabbir M. HossainPublisher:
ISBN:
Category : Pavements
Languages : en
Pages : 34
Book Description
To facilitate pavement design, the new proposed mechanistic-empirical pavement design guide recommends the resilient modulus to characterize subgrade soil and its use for calculating pavement responses attributable to traffic and environmental loading. Although resilient modulus values could be determined through laboratory testing of actual subgrade soil samples, such testing would require significant resources including a high level of technical capability to conduct the test and interpret results. For smaller or less critical projects, where costly and complex resilient modulus testing is not justified, correlation with the results of other simpler tests could be used. The Virginia Department of Transportation (VDOT) uses a simple correlation with the California bearing ratio (CBR) to estimate the resilient modulus in their current pavement design procedure in accordance with the 1993 AASHTO design guide. As this correlation with CBR is considered to be poor, a simpler unconfined compression (UC) test was explored for better estimation of the resilient modulus of fine-grained soils. Several models were developed in this study to estimate the resilient modulus of fine-grained soil from the results of UC tests. The simplest model considers only the UC strength to predict the resilient modulus with a fair correlation. The more detailed models with stronger correlations also consider the plasticity index, percentage of materials passing the No. 200 sieve, and modulus of the stress-strain curve from the UC test. These models are recommended for implementation by VDOT