Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"granular base"”.
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Development of a Mechanistic Model for Geogrid Reinforced Flexible Pavements
… response model for the analysis of geogrid base reinforced flexible pavements and to investigate the response benefit of geogrid-reinforcement. This is an axisymmetric finite element structural model that considers the nonlinear, stress dependent pavement foundation geomaterials, i.e., …
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CHARACTERIZATION OF CRUSHED PORTLAND CEMENT CONCRETE RUBBLE AGGREGATE FOR URBAN ROADS
… road building materials include well graded granular base material, subbase, crushed rock and a wearing surface of either conventional hot mix asphalt concrete (HMAC) or Portland cement concrete (PCC). To ensure long term pavement performance, quality aggregate sources are needed in all road …
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Moisture Content Determination and Temperature Profile Modeling of Flexible Pavement Structures
… using hot-mix asphalt (HMA) placed over a granular base material. The strength of this pavement system is strongly influenced by the local environmental conditions. Excessive moisture in a granular base layer can cause that layer to lose its structural contribution by reducing the area over …
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Flexible Pavement Rut Depth Modeling For Different Climate Zones
… climate zones to predict pavement rutting on granular base based on LTPP data. Flexible pavements with granular base course were considered for this study. These models lead to better understanding of rutting phenomena and the factors that may have affect in pavement rutting. In addition, …
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Analysis of tire-pavement interaction and pavement responses using a decoupled modeling approach
… as a linear viscoelastic material and the granular base layer is modeled as a nonlinear anisotropic material. The FE pavement model was used to analyze critical pavement responses in thin and thick asphalt pavements considering different damage mechanisms. This dissertation concludes that …
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Evaluation of Laboratory Durability Tests for Stabilized Aggregate Base Materials
… available for assessing stabilized aggregate base materials. The laboratory research associated with this project involved two granular base materials, three stabilizers at three concentration levels each, and three durability tests in a full-factorial experimental design. The granular base …
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Permanent Deformation Behaviour of Unbound Granular Materials in Pavement Constructions
… level of permanent deformations in the unbound granular layers (UGL) in pavement constructions under consideration of the seasonal effects. From this data a serviceability limit line (plastic shakedown limit) stress boundary for the unbound granular materials (UGM) was defined for different …
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In-Situ Behavior of Geosynthetically Stabilized Flexible Pavement
The purpose of a geotextile separator beneath a granular base, or subbase in a flexible pavement system is to prevent the road aggregate and the underlying subgrade from intermixing. It has been hypothesized that in the absence of a geotextile, intermixing between base course aggregate and soft …
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Comparing Layer Types for the Use of MEPDG for FDR Design
… Current practice is to treat FDR as an unbound granular base layer, but this does not account for the added stability of the selected stabilization technique. However, previous research has shown that FDR may be more accurately characterized as a less-aged asphalt concrete. Until a new layer …
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Mechanistic-Empirical Evaluation of the Mn/ROAD Low-Volume Road Test Sections
… FWD test data were used to study the effect of granular material quality on pavement performance and deflection response. The results from the rapid shear tests and permanent deformation tests show that the rutting potential of a granular material can be characterized from rapid shear test at …
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An investigation of the effect of dynamic and static loading to geosynthetic reinforced pavements overlying a soft subgrade
… (dynamic in nature), rapid deterioration of the base layer material and progressive permanent deformation of the surface will occur. This not only reduces the serviceability of the pavement structure but also its design life. In this study, reinforcement geosynthetics (geogrids and geotextiles) …
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Granite By-Products for inverted pavement technique
… I have focused the attention on the behavior of granular base layer. Thanks to this technique is actually possible to take advantage of mechanical features of base layer, creating base layers that assure high and long lasting performances with almost zero environmental costs. The Project is …
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Permanent Deformation Behavior of Airport Flexible Pavement Base and Subbase Courses
… in the flexible pavement test sections in the granular base and subbase layers, designated as NAPTF P209/P154 base and subbase according to FAA's construction specifications. To account for the rutting performances of these substantially thick granular layers, a comprehensive set of repeated …
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An Investigation of the Optimal Sample Size, Relationship between Existing Tests and Performance, and New Recommended Specifications for Flexible Base Courses in Texas
The purpose of this study was to improve flexible base course performance within the state of Texas while reducing TxDOT’s testing burden. The focus of this study was to revise the current specification with the intent of providing a “performance related” specification while optimizing sample sizes …