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Showing 1 to 10 of 10 for “"Aggregate Shape"”.
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Development of image analysis techniques to assist evaluation of both air void structure and aggregate shape factors in concrete
… that arise due to characteristic of the sand and aggregates, excess water added and a lack of consolidation whilst plastic. Aggregate form, shape and texture are known to influence the way particles pack together and therefore the amount of space left between and amongst the particles. The second …
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Development of Three-Dimensional Image Analysis Techniques to Determine Shape and Size Properties of Coarse Aggregate
A new aggregate image analyzer, UIAIA, was developed to provide a reliable means for automating the determination of coarse aggregate size and shape properties. This new device uses 3 cameras to collect aggregate images from three orthogonal directions. The use of 3 images for each particle …
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Evaluation of the compacted aggregate resistance test
The Compacted Aggregate Resistance (CAR) test is a procedure used to analyze the quality of asphalt. It is a punch shear test that indirectly measures the shape and angularity of fine aggregates. The CAR test is in the developing process of replacing the current Superpave standard for fine …
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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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Rapid shape characterization of crushed stone by PC-based digital image processing
Aggregate shape and texture are important parameters that have a direct influence on the strength and durability of the asphalt and concrete products made from these materials. Shape is characterized in terms of elongated and flat particles. Typically, a given batch of material is rejected if more …
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Permanent deformation behavior of unbound granular materials and rutting model development
… to produce 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 …
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Advanced image analysis and techniques for degradation characterization of aggregates
Morphological or shape properties of virgin and recycled aggregate sources are known to affect pavement and railroad track mechanistic behavior and performance significantly in terms of strength, modulus and permanent deformation. Under repeated traffic loading aggregate particles used in …
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Digital Mix Design for Performance Optimization of Asphalt Mixture
… of asphalt concrete of different gradations of aggregates. The optimum gradation could be determined by manipulating the particle locations and orientations and placing smaller particles in the voids among larger particles. This method aims at an optimum gradation, which has been achieved …
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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 …