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 118 for “"HMA"”.
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Dissipated Energy Concepts for HMA Performance: Fatigue and Healing
The uniqueness of the RDEC relationship allows it to be implemented into a pavement structural (thickness) design procedure. This procedure has the ability to utilize existing pavement response values with mixture properties to generate the PV-Nf relationship validated in this thesis. It also has …
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Evaluation of methods for determining bulk specific gravity of Hma specimens
… of rutted and unrutted Hot Mix Asphalt (HMA). Bulk specific gravity determination was performed using three methods: Water Displacement(TM), Parafilm(TM) and Corelok(TM). The evaluations were made on a total of sixty-two sets of two or three specimens, four different mix designs for …
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Comparison of methods for determining bulk specific gravity of Hma specimens
In this study, bulk specific gravity measurements of coarse graded Hot Mix Asphalt were conducted using two methods, Parafilm(TM) and Corelok(TM). The measurements were compared for similarity and repeatability of results. The comparisons were made on two sets of specimens, unrutted and rutted …
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Impact of Lime on the Mechanical Properties of HMA Mixtures in Nevada
… lime on the mechanical properties of typical HMA mixtures in Nevada. This research differed from previous studies in several respects. First, because lime is used in HMA primarily for anti-stripping benefits, previous studies rarely quantified lime's other performance benefits. Second, because …
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Investigation of Fatigue Properties of Superpave HMA at the Virginia Smart Road
… testing of eleven Superpave hot mix asphalt (HMA) mixtures in use at the Virginia Smart Road. Mixtures were sampled from the plant and produced in the laboratory to investigate the influence of production method. Specimens were cut from the in-situ pavement and compacted in the laboratory to …
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Development of a rapid test to determine moisture sensitivity of HMA (Superpave) mixtures
Exiting test methods to determine moisture sensitivity in hot mix asphalt are time consuming and inconsistent. This research focused on wheel tracking devices to develop a rapid test method to evaluate moisture sensitivity. The Asphalt Pavement Analyzer (APA) and the Hamburg Wheel Tracking Device …
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AN HMA DOMAIN-CONTAINING PROTEIN NaKR1 REGULATES LONG-DISTANCE FLORIGEN MOVEMENT IN ARABIDOPSIS THALIANA
… HERE WE REPORT THAT A HEAVY-METAL-ASSOCIATED (HMA) DOMAIN-CONTAINING PROTEIN, SODIUM POTASSIUM ROOT DEFECTIVE1 (NAKR1), IS ALSO INDUCED BY CO UNDER LDS, AND PLAYS AN IMPORTANT ROLE IN FT TRANSPORTATION. LOSS OF FUNCTION OF NAKR1 RESULTS IN EXTREMELY LATE FLOWERING ONLY UNDER LDS. FURTHERMORE, …
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Sustainable Material Solution for Flexible Pavements; Performance Evaluation and Impact Assessment of Utilizing Multiple Recycled Materials in HMA
… applying recycling materials to Hot-Mix Asphalt (HMA)?, (2) What are the optimum mix designs for those recycled materials in HMA?, and (3) Can multiple recycled materials be used at the same time to compensate each other*s drawbacks? This study evaluates the structural performance and …
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Development of differential scheme micromechanics modeling framework for predictions of hot-mix asphalt (HMA) complex modulus and experimental validations
The viscoelastic modulus of hot-mix asphalt (HMA) such as the complex modulus, E*, is an essential material parameter for better paving mixture design and asphalt pavement design. Under certain circumstances, it is desirable that a reasonable modulus value of certain HMA mixtures be estimated for …
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Analysis of Hot Mix Asphalt (HMA) Linear Viscoelastic and Bimodular Properties Using Uniaxial Compression and Indirect Tension (IDT) Tests
The major Hot-Mix Asphalt (HMA) input for mechanistic-empirical (M-E) flexible pavement design is the dynamic complex modulus obtained from either the uniaxial or triaxial compressive dynamic modulus test. Furthermore, as part of the performance-based mix design process, the triaxial dynamic …
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Evaluation of field performance of fine-graded hot mix asphalt on Illinois' roadways
… the properties tested in order to compare CG HMA and FG HMA. Accelerated pavement testing also took place in order to compare both FG HMA and CG HMA. In all performance tests, FG HMA performed either equal or better than CG HMA. Among the concerns that transportation agencies have stated about …
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Modeling reflective cracking development in hot-mix asphalt overlays and quantification of control techniques
Hot-mix asphalt (HMA) overlay is regarded as an efficient method to rehabilitate moderately deteriorated pavements. Despite the application of an adequately designed overlay, when HMA overlays are built on jointed concrete pavement (JCP) or a cracked surface, reflective cracking can develop shortly …
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Laboratory Evaluation of Warm Mix Asphalt Mixtures in South Dakota, USA
… to moisture damage and rutting than traditional HMA mixtures.The objective of this research was to evaluate various types of WMA paving technologies relative to HMA mixtures to determine their suitability for use in South Dakota in various applications. This objective was met by conducting an …
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Development of a Mechanistic-Based Approach to Evaluate Critical Conditions of Hot Mix Asphalt Mixtures
… conditions. In particular, hot mix asphalt (HMA) mixtures are believed to have a critical combination of temperature and traffic loading rate which will result in excessive permanent deformation. Designing the appropriate mixture type and properties are significantly important tasks that …
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Impact of Anti-Strip Additives on Performance of Asphalt Pavements
… influence on the moisture sensitivity of the HMA mixture. This study extended the evaluation to cover the impact of lime and liquid additives on the structural performance of the HMA mixtures and their impact on the long-term performance of typical HMA pavements.Aggregates and binders were …
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Verification of the dissipated energy based fatigue model using field data
… at the bottom of the top hot-mix asphalt (HMA) layer must be limited to below a certain value known as the fatigue endurance limit (FEL). In this thesis, a method for estimating the allowable strain in the asphalt layers of flexible airfield pavements is proposed based on the concept that …
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Remote Detection of Surging Glaciers Across High Mountain Asia
High Mountain Asia (HMA) hosts the largest glacier concentration outside of polar regions. This region also represents the second major surge cluster, globally. Despite numerous sub-regional and individual glacier – scale studies of surging, our understanding of this phenomenon remains largely …
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On Dynamic Modulus of Asphalt Concrete for Moisture Damage
… in recent years for evaluating Hot Mix Asphalt (HMA) rutting and fatigue cracking performances. Indeed, the recently developed Mechanistic Empirical Pavement Design Guide (MEPDG) uses E* data for stress and strain calculation, and E*-based models for prediction fatigue and rutting performances of …
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Developing pavement preservation and mitigation strategies using Pavement ME design guide for Rhode Island DOT
… of the surface and existing hot mix asphalt (HMA) layers, traffic volume, binder grade of the surface HMA layer and the base layer modulus. The surface HMA layer thickness and traffic volume were significant at 95% confidence level for both types of rutting and terminal IRI. The existing HMA …
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