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 20 of 27 for “"base course"”.
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Cement Stabilized Crushed Stone Base Course Strength and Stiffness Analysis
… calculated from subgrade resilient modulus, subbase modulus of elasticity (MOE), and the subbase depth. The ME instead includes material properties such as MOE and Poisson’s ratio, in addition to a large list of other inputs toprovide a pavement design that can resist required traffic loadings …
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An improved backcalculation method to predict flexible pavement layers moduli and bonding condition between wearing course and base course.
… interface condition between the wearing and the base courses in addition to the layer moduli, which can be considered an improvement to the existing procedures. A two stage database procedure has been used to predict the above parameters and to facilitate the determination of the deflection …
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Mechanistic-Empirical Pavement Design Procedure For Geosynthetically Stabilized Flexible Pavements
… one through three have a 100-mm-thick limestone base course (VDOT 21-B), sections four through six have a 150-mm-thick base course, and sections seven through nine have a 200-mm-thick base course. Three sections were stabilized with geotextiles and three with geogrids at the base course-subgrade …
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Geosynthetic stabilization of unpaved roads on soft ground : a field evaluation
… a variable thickness of sandy gravel base course material, between 25 and 50 cm thick. They were trafficked in sequence by a vehicle of standard axle load. An important governing parameter for interpretation of behavior is the influence of base course thickness on the relationship …
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In-Situ Behavior of Geosynthetically Stabilized Flexible Pavement
… 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 subgrade …
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Evaluation of binder grades on rutting performance
… The research included mix designs for the base course and the wearing course of the pavement. The base course was a 37.5 mm mix with limestone aggregates and the wearing course was a 12.5 mm mix with predominantly blast furnace slag aggregates.;The three different binders were compared by …
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Evaluation of selected airport pavements in New Mexico
… major goal is to rank these airport pavements based on their functional and structural conditions. The functional conditions of the pavements are evaluated based on the field collected surface distress data and skid resistance. Field collected distress data such as rutting, cracking, and …
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Laboratory performance of geogrid and geotextile reinforced flexible pavements
… tests sections were constructed using different base course thicknesses and different subgrade CBR values. The pavements were dynamically loaded at a frequency of 0.5 Hz using a computer controlled pneumatic loading system. A force of approximately 9000 lbs (40 kN) was applied to the pavement …
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Characterization of waste recycled glass as a highway material
… costs associated with procuring glass cullet. Based on these surveys, glass cullet was identified for use in base course, subbase, subgrade and embankments and also for backfill applications. A test program was devised to test the engineering suitability of glass cullet samples for the above …
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Use of wicking geotextile to dehydrate road embankments
… is controlled by the ambient environment. The base course aggregate is very sensitive to water content variations. Unfortunately, conventional drainage system can only drain gravity water, but not capillary water, and it cannot work under unsaturated conditions. Consequently, no matter how well …
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Research needs relating to performance of aggregates in highway construction
… Bituminous Concrete and Related Materials (III) Base Course and Shoulder Materials (IV) General (involving at least two of the first three areas) The formulation of the research problem statements was based upon information obtained from an extensive literature survey, a Workshop Conference …
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Field observations of the early-age behavior of jointed plain concrete pavements
… highway pavements with open graded stabilized base courses have been found to develop non-uniform, transverse saw-cut joint-crack developments and extensive slab movement behaviors, which cause unwanted premature joint failures. Phase I of this study determined the variables associated with the …
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Foundation Design of Low Volume Roads: Evaluation and Performance
… to obtain recommended asphalt surfacing and base course layer thickness based on the subgrade support and the average daily traffic (ADT) of the road. The main objective of this study is to relate the surface condition of LVRs to their ADT, layer thicknesses, foundation material properties, …
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Permanent deformation behavior of unbound granular materials and rutting model development
… inadequate rut estimates in unbound aggregate base/subbase layers by discounting the contribution of stress state from the original Tseng and Lytton (1989) model. This research study was aimed at developing a new permanent deformation prediction model that would properly take into account the …
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Performance evaluation of unconventional aggregates from primary and recycled sources for construction platform and low volume road applications
… cap’, ‘primary crusher run’ and ‘macadam stone base’) have been successfully used by several transportation agencies previously, performances of recycled materials, e.g. reclaimed asphalt pavement (RAP) and recycled concrete aggregate (RCA) with possible large particle sizes, are not readily …
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Laboratory Comparison of Full Depth Reclamation Stabilization Techniques Using Arkansas Field Materials
… as a predetermined portion of the underlying base and sub-base materials with a stabilizer to create a new, stronger stabilized base course. Common stabilization techniques include the addition of asphalt emulsion, asphalt foam, or cement. Using the North Carolina emulsion FDR mix design, the …
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An investigation into the administrative procedures of teacher education in colleges of education in KwaZulu
… attain the above idea 1, the "Teaching Science Course" must be restructured so that it is able to produce effective and efficient teachers, managers, administrators and leaders . The critical review of the Teaching Science Sylabus presented above < paragraph 2.IE), showed that the "Teaching …
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Flexible Pavement Rut Depth Modeling For Different Climate Zones
… 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, these models …
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Sensitivity of MEPDG Using Advanced Statistical Analyses
… pavement design has changed from old method based on empirical relation to a new method called Mechanistic Empirical Pavement Design Guide (MEPDG). It is essential to perform a detailed sensitivity analysis of MEPDG outputs to input variables. In particular, MEPDG inputs need to be classified …
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Impact of reclaimed asphalt pavements on pavement sustainability
… to evaluate the feasibility of using high RAP in base-course asphalt mixtures. A holistic approach is taken to achieve the objective of the study; mixtures with high RAP contents are not only designed and characterized, their economic and environmental impacts have also been evaluated. The asphalt …
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