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 24 for “"Aggregate Gradation"”.
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Impact of Aggregate Gradation on Airfield (P-401) Asphalt Mixture
… 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 specification limits …
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Aggregate gradation impacts on fresh properties of 3D concrete printing mixtures
… no comprehensive framework exists to optimize aggregate gradation and paste volume, thereby reducing cement content, to meet targeted fresh property requirements for printability. This research study employed an experimental central composite design to quantify the effects of sand fineness and …
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Role of Aggregate Packing in Segregation Resistance and Flow Behavior of Self -Consolidating Concrete
… and in the field. It is found that smaller aggregate size, continuous aggregate gradation, lower aggregate density, and higher paste viscosity and yield stress reduce dynamic segregation. Among these factors, aggregate size, gradation, density, and paste rheology have bigger effects than …
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Evaluation of ultrasound method for determining aggregate gradations in asphaltic concrete mixes
… a geotechnical method, ultrasound, to detect aggregate gradation differences in asphaltic concrete pavements. Empirical data had previously been used to suggest that the more coarse the gradation, the less incidence's of rutting. It is my thesis that the more coarse the gradation, the higher …
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Evaluation of Troxler 3241-C nuclear asphalt content gauge used for Marshall specimens
… gauge. The following parameters were considered: aggregate type, aggregate gradation, air-void content, moisture content in specimens, asphalt cement content, and total specimen weight. Different calibration models were developed for different bituminous mixtures.
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Evaluation of rutting resistance of coarse graded aggregate asphaltic concrete mixes in Clark County, Nevada
… evaluate the effectiveness of utilizing coarse aggregates in asphaltic concrete pavements for reducing rutting in Clark County, Nevada. Previous specifications used for asphaltic concrete mix designs in the Clark County area allowed for a wide range of aggregate gradations. The aggregate …
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Evaluation of the effect of fines on asphalt concrete
… been developed for determining the quantities of aggregate and asphalt cement used in asphalt concrete. This research consists of the evaluation of the surface area of different aggregates used in the state of West Virginia. This factor is important because the amount of asphalt needed to coat the …
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Stiffness and deformation properties of asphalt open graded friction course containing cement coated natural aggregates
… physical properties of cement coated secondary aggregates, namely surface roughness and angle of internal friction and how these properties are related to the performance of Open Graded Friction Course asphalt mixtures, OGFC made from these materials under laboratory Uniaxial, deformation and …
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Evaluation of the IDEAL-CT for Hveem-Designed Asphalt Mixtures in Nevada
… to changes in mix design parameters, such as aggregate gradation and asphalt binder content, was evaluated, and results were compared between Hveem and SGC compaction methods.Findings indicate that both specimen diameter and compaction method influence the IDEAL-CT test parameters, with …
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Investigating Use of Aggregate Density to Develop Design Aggregate Structure for Asphalt Concrete Mixtures
… are various potential causes for the failures, aggregate density within the mix when designed at 80 gyrations was of specific concern to this thesis and was compared to the maximum dry density of the aggregate as measured using ASTM D4253-00. The objective of this research was to determine if …
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Balanced Mix Design of Asphalt Mixtures for Intersections
… of Transportation (NDOT) recommended a new gradation specification to be used at intersections. The unique features of the intersection's asphalt mixture were its resistance to rutting and shoving. In an attempt to alleviate permanent deformation problems at intersections, asphalt mixtures …
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Improving the Sustainability of Performance-Based Concrete Overlay Mix Design made with Rounded Aggregate
… mix designs using locally available rounded aggregates, such as river gravel, to improve workability, reduce cement usage, and enhance overall sustainability. The research is divided into three integrated phases. The first phase focuses on optimizing aggregate gradation using the modified …
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Evaluation of selected airport pavements in New Mexico
… to collect samples of asphalt cores, base aggregate, and soils. These samples are then transferred to the Pavement Laboratory at the University of New Mexico for testing. Soil tests include index properties, moisture, and classification tests. Using these laboratory test results, a strength …
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Selecting material constituents and proportions for specific roller-compacted concrete mechanical properties
… must be minimized. A wide range of RCC aggregate gradations were batched, tested, and found to impact RCC properties especially compressive strength. The coarse-fine aggregate ratio was the parameter linked most directly to RCC compressive strength. Aggregate type (recycled aggregates, …
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Displacement rate and temperature effect on asphalt concrete cracking potential
… energy can be governed by mixture volumetric, aggregate skeleton and binder grade. Mixes with similar volumetric, generally defined by aggregate gradation and binder grade, could have similar low temperature fracture energy in this region. However, it was shown that when these mixes were tested …
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Performance-based evaluation of unbound aggregates affecting mechanistic response and performance of flexible pavements
Unbound aggregates are widely used in road construction to replace unsuitable soil, prepare pavement working platform or construct pavement foundation layers. Their primary function in flexible pavements is to distribute wheel loads and provide adequate protection of the subgrade. However, the …
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Aggregate characteristics affecting response and performance of unsurfaced pavements on weak subgrades
… covering the prepared subgrade with an unbound aggregate layer of sufficient thickness such that traffic-induced wheel loads are adequately distributed and stresses on the subgrade can be tolerated. Aggregate gradation and field-density requirements are commonly the only considerations for …
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Evaluation of Balanced Asphalt Surface Mixtures with Conventional and High RAP Contents Using Laboratory and Accelerated Pavement Testing
… in the plant with no significant deviations in aggregate gradation and asphalt binder content from the design specifications. The combined effect of variations in different volumetric properties during production may influence the primary performance of the mixtures, potentially resulting in an …
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