Full-scale studies of the performance of plant in the compaction of soils and granular base materials

1967 ◽  
Vol 4 (2) ◽  
pp. 76
Keyword(s):  
Full Scale ◽  
Base Materials ◽  
Granular Base

First Paper: Full-Scale Studies of the Performance of Plant in the Compaction of Soils and Granular Base Materials

1966 ◽  
Vol 181 (1) ◽  
pp. 79-90
Author(s):  
W. A. Lewis
Keyword(s):  
Research Laboratory ◽  
Test Procedure ◽  
Full Scale ◽  
The Road ◽  
Base Materials ◽  
Wide Range ◽  
Road Research Laboratory ◽  
Granular Base

The installation and test procedure employed at the Road Research Laboratory for studying the performance of compaction plant is described. The results of tests on a wide range of equipment are summarized and an outline is given of some investigations of more fundamental factors likely to affect the performance of compaction plant. The author would like to acknowledge the help given by his colleagues and particularly Mr A. W. Parsons of the Laboratory who assisted in much of the work described in the paper. The work described in this paper was carried out as part of the programme of research of the Road Research Laboratory and is contributed by permission of the Director of Road Research. Reproduced by permission of the Controller of H.M. Stationery Office, Crown copyright.

scholarly journals Prediction Model of Elastic Modulus for Granular Road Bases

2020 ◽  
Vol 2 (1) ◽  
pp. p35
Author(s):  
Zainab Ahmed Alkaissi ◽  
Hassan Adnan
Keyword(s):  
Elastic Modulus ◽  
Linear Regression Analysis ◽  
Base Material ◽  
Recycled Concrete ◽  
Dry Density ◽  
Concrete Aggregate ◽  
Vertical Loading ◽  
Base Materials ◽  
Granular Base ◽  
Road Bases

The estimation of elastic modulus for road bases is the primary objective of this research which is implemented a significant role in transmitting the vertical loading to the pavement foundation layers. In this study, the effect of weathering conditions on the stiffness of base course is investigated and implied the durability test by subjecting the prepared samples to a different numbers of wet-dry cycles (0,2, 4, 6, 8 and 10). A conventional base materials of local natural gravel aggregate and treated base materials with recycled concrete aggregate RCA at different percentages (0%, 25%, 50% 75% and 100%) is adopted in this research. The elastic characteristics are estimated in terms of elastic modulus. Elastic modulus are estimated by passing the ultrasonic pulse velocity through the untreated and treated base materials laboratory specimens. This test can be used to study the elastic modulus properties of base materials. A multiple linear regression analysis is used for prediction the elastic modulus using the SPSS (software ver.21). Elastic Modulus (kPa) is the dependent variable whereas the independent variable are; No. of wet- dry cycle and Percent (%) of RCA stabilizer. The obtained results for elastic modulus (Es) of granular base material layer showed increasing in elastic modulus with percentage of RCA%., results revealed that the (Es) values reached a maximum value of (6927kPa) for 100%. For the OMC’s values increases due to the percentage increment of RCA in granular base material mixture, this increment in water contents is refer to high absorption capacity of the paste clinging to the RCA. On other side the dry density decrease gradually with adding percentage of (RCA) in granular base material mixture.

scholarly journals Investigation of the resilient behavior of granular base materials with simple test apparatus

2011 ◽  
Vol 45 (5) ◽  
pp. 695-705 ◽  
Author(s):  
Alemgena A. Araya ◽  
Marius Huurman ◽  
André A. A. Molenaar ◽  
Lambert J. M. Houben
Keyword(s):  
Simple Test ◽  
Test Apparatus ◽  
Base Materials ◽  
Granular Base ◽  
Resilient Behavior

Effect of Moisture Content on the Shakedown Limits of Base Course Materials

2020 ◽  
pp. 036119812095731
Author(s):  
Munir D. Nazzal ◽  
Louay N. Mohammad ◽  
Aaron Austin ◽  
Ahmad Al Hosainat
Keyword(s):  
Moisture Content ◽  
Triaxial Tests ◽  
Course Materials ◽  
Base Materials ◽  
Multi Stage ◽  
Base Course ◽  
Granular Base ◽  
Shakedown Limit ◽  
Elastic Shakedown ◽  
Plastic Shakedown

This paper summarizes the results of a laboratory testing program that was conducted to determine the effects of moisture content on the shakedown limits of unbound granular base materials. Two different types of granular base materials were investigated in this study, namely limestone and sandstone. Multi-stage repeated load triaxial tests were performed on these materials. The results of the tests were analyzed within the framework of the shakedown theory. The results indicate that the moisture content had an influence on the slope of the elastic and plastic shakedown limits lines. The effect of the moisture content was more pronounced on the slope of the elastic shakedown limit line, however. The moisture content affected the intercept of the elastic and plastic shakedown limits lines more significantly than the slope of these lines. The limestone material exhibited greater decrease in the intercept of the elastic and plastic shakedown limits with increase in moisture content compared with the sandstone material. This was explained by the limestone’s finer gradation.

Mechanistic Analyses of Geosynthetic Reinforced Aggregate Road Test Sections

2019 ◽  
Vol 2673 (12) ◽  
pp. 783-797
Author(s):  
Jeb S. Tingle
Keyword(s):  
Large Scale ◽  
Full Scale ◽  
Anisotropic Models ◽  
Linear Elastic ◽  
Base Materials ◽  
Scale Test ◽  
Pavement Response ◽  
Aggregate Base ◽  
Nonlinear Elastic ◽  
Development Center

Large-scale laboratory box tests and a full-scale traffic test were performed by the U.S. Army Engineer Research and Development Center to evaluate the performance of geosynthetic reinforced aggregate road sections constructed with marginal base materials over a typical subgrade. The large-scale laboratory testing and full-scale test section included eight different instrumented aggregate road sections including three different aggregate base materials and two different geosynthetics. Mechanistic analyses of each pavement section were conducted using linear elastic, nonlinear elastic, and nonlinear anisotropic models to predict the critical pavement response parameters. The analyses show that mechanistic tools can be effectively used to estimate the critical pavement response parameters for unpaved roads.

Road contact stresses and forces under tires with low inflation pressure

2000 ◽  
Vol 27 (6) ◽  
pp. 1248-1258 ◽  
Author(s):  
Robert A Douglas ◽  
W DH Woodward ◽  
A R Woodside
Keyword(s):  
Single Layer ◽  
Field Trials ◽  
Full Scale ◽  
Contact Forces ◽  
Laboratory Studies ◽  
Inflation Pressure ◽  
Model Study ◽  
Granular Base ◽  
Vertical Contact ◽  
Full Scale Tests

Many field trials have been undertaken to demonstrate the benefits of reducing the inflation pressure of the tires of heavily loaded haul vehicles, but few carefully controlled laboratory studies have been performed. An earlier full scale laboratory study indicated that tire inflation pressure had far less effect on subgrade strains for unpaved, single-layer granular road structures than the tire loading itself, so attention was directed to the behaviour of the granular base at the tire tread - road surface interface. In the present paper, the results of full scale tests performed using a laboratory apparatus designed to measure the dynamic vertical, transverse, and longitudinal contact forces under tires with varying loads and inflation pressures are reported. Vertical contact forces were observed to be highly non-uniform, both across and along the contact patch.Key words: central tire inflation systems, CTI, model study, haul trucks, unbound roads, unpaved roads, access roads.

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