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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 40 for “"Asphalt Mixture"”.
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Asphalt Mixture Design Concepts to Develop Aggregate Interlock
From the beginning of asphalt mixture design it was desired to understand the interaction of aggregates, asphalt, and the voids created during their compaction. In asphalt mixture design, guidance is lacking in the selection of the design aggregate structure and understanding the interaction of …
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Digital Mix Design for Performance Optimization of Asphalt Mixture
Asphalt mix design includes the determination of a gradation, asphalt content, other volumetric properties, the evaluation of mechanical properties and moisture damage potentials. In this study, a computational method is developed to aid mix design. Discrete element method (DEM) was used to …
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Impact of Aggregate Gradation on Airfield (P-401) Asphalt Mixture
… Federal Aviation Administrations' (FAA) current asphalt mixture gradation specification limits are finer, and the allowable ranges are more restrictive than control points for similar nominal maximum aggregate size mixtures within the Superpave mix design methodology. Ensuring the gradation …
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Comparative Evaluation of Field and Laboratory-Produced Foamed Asphalt Mixture from Reno, Nevada
… performance of field-produced HMA and foamed WMA mixtures from the Bravo Ave project in Reno, Nevada in comparison to respective laboratory-produced mixtures utilizing the same materials and mix design. Each mixture contained 15% RAP and was produced with a polymer-modified PG64-28NV asphalt …
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Asphalt mixture evaluation using performance space diagrams, digital image correlation, and discrete element modeling
The use of asphalt modifiers and recycled asphalt materials in asphalt concrete has generated a need for greater laboratory evaluation. Asphalt modifiers, such as styrene butadiene styrene (SBS) polymer, bio-modifiers, and warm mix asphalt processes, and recycled asphalt materials, such as recycled …
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Development of an alternative test to obtain asphalt mixture creep compliance at low temperatures
… low temperature fracture and creep properties of asphalt materials. The information from these tests enables pavement engineers to design and construct asphalt pavements that can withstand the stresses caused by thermal loads and underlying cracks in the field. This study evaluates if the DC(T) …
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Development of a Micromechanical Modeling Approach to Predict Asphalt Mixture Stiffness Using the Discrete Element Method
The MDEM approach was also utilized in the design and optimization of physical test equipment such as hollow cylinder tensile tester. In addition, tensile strength simulations and creep stiffness prediction are also very promising by using the MDEM approach.
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Prediction of in-situ asphalt mixture density using ground penetrating radar: theoretical development and field verification
In-situ asphalt mixture density is critically important to the performance of flexible pavements: density that is too high, or too low, may cause early pavement distresses. Traditionally, two methods have been commonly used for in-situ asphalt mixture density measurement: laboratory testing on …
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The Development of Initial Asphalt Mixture Acceptance Criteria Using the SCB test and the I-FIT Test
<p>Cracking has become the primary asphalt pavement distress in Arkansas. Arkansas along with other states have implemented a test to measure rutting resistance. This paper presents research to implement a cracking resistance test to further modify the Superpave volumetric asphalt mixture design …
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Comprehensive Evaluation of Asphalt Mixtures in Arid Climatic conditions
… is the leading cause of poor performance in the asphalt-wearing course in Kuwait's arid climatic conditions. The extreme conditions of Kuwait and poor asphalt mix design characteristics have further accelerated the raveling and deterioration of the in-service asphalt pavements. Combating this …
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Balanced asphalt mix design and pavement distress predictive models based on machine learning
Traditional asphalt mix design procedures are empirical and need random and lengthy trials in a laboratory, which can cost much labor, material resources, and finance. The initiative (Material Genome initiative) was launched by President Obama to revitalize American manufacturing. To achieve the …
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Binder Film Thickness Effect on Aggregate Contact Behavior
… a three-phase material composed of aggregates, asphalt binder and air voids, asphalt mixture could be considered as a visco-elastic material in the low stress level. Since the behavior of the mixture depends largely on the relationship of different components, a well developed contact model for …
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Balanced Mix Design of Asphalt Mixtures for Intersections
… intersections. Realizing the need for different asphalt mixtures at or near intersections, a past cooperative research between University of Nevada, Reno (UNR) and Nevada Department of Transportation (NDOT) recommended a new gradation specification to be used at intersections. The unique features …
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Impact of recycled asphalt shingles on asphalt concrete characteristics
The use of recycled materials in asphalt mixtures such as reclaimed asphalt pavements (RAP) and more recently recycled asphalt shingles (RAS) have become widely accepted in the United States as a replacement for virgin asphalt binder or virgin aggregates. However, the economics and the challenges …
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The effects of micro and nano size bauxite particles in modified asphalt binders and asphaltic mixtures
… to focus how to improve the characteristics of asphalt mix in order to reduce the pavement deteriorations. This study aims to evaluate the effects of Malaysian Micro bauxite powders (MBP) and Nano bauxite powders (NBP) with 3%, 5% and 7% by mass of bitumen. Conventional bitumen 80/100 …
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Analysis of Fine Asphalt Concrete Mixture Gradations from Various Sources to Enhance Durability
… the factors that can influence the durability of asphalt mixtures, is the gradation. This thesis will look into the effect of fine aggregate dense gradations on asphalt mixture durability for sources from the state of Nevada. Based on the available literature, finer gradation asphalt mixes have …
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Performance Characteristics of Polyethylene Terephthalate (PET) Modified Asphalt
… Therefore, the use of ground PET particles in asphalt may provide an environmentally friendly solution for the disposal of large quantities of PET waste. This study evaluated the performance of PET as an asphalt modifier with both asphalt binder and asphalt mixture testing. The binder testing …
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Performance Evaluation of Asphalt Mixtures with Tire Rubber Modified Binder
… for recycling scrap tires is to use them as an asphalt modifier for paving applications.The necessity of recognizing the performance of terminal blend tire rubber modified asphalt binder (TTR) hot mix asphalt (HMA) mixtures is imperative to keep improving the overall conditions of the roads …
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Some aspects of the mechanical testing of hot rolled asphalt surfacings.
Hot Rolled Asphalt Wearing course mixtures, containing up to 55% by mass of coarse aggregate, were tested over a range of binder contents using the following test methods: Marshall Test Indirect-Tensile Test Wheel-Tracking Test. The results obtained were used to assess the ability of each of these …
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Development of a Mechanistic-Based Approach to Evaluate Critical Conditions of Hot Mix Asphalt Mixtures
The performance of an asphalt pavement is significantly impacted by the properties of the asphalt mixture, pavement structure, and the imposed environmental and traffic loading conditions. In particular, hot mix asphalt (HMA) mixtures are believed to have a critical combination of temperature and …
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