February 1, 2020 Thesis Open Access

ZEKARIYAS MUSSIE AMANU

DCAT Export

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    <dct:title>ANALYSIS OF INHERENT ANISOTROPY IN ASPHALT CONCRETE MIXTURES</dct:title>
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    <dct:description>&lt;p&gt;Asphalt Concrete mixtures were characterized by one of mechanistically modeling&lt;br&gt; technique, inherent anisotropy of the material. The performance of AC&lt;br&gt; mixtures is influenced by the arrangement of aggregates and their associated&lt;br&gt; air voids. The main objective of this study to analyze aggregate orientation&lt;br&gt; and evaluates inherent anisotropy in AC mixtures using X-ray CT images&lt;br&gt; by means of microstructure parameter. There are three AC mixture designs:&lt;br&gt; coarse graded CMHB Type C, gap graded PFC and fine graded Superpave&lt;br&gt; Type C AC mixtures. They are prepared with hard limestone aggregate and&lt;br&gt; compacted with SGC, having a PG 76-22 modified binder.&lt;br&gt; Digital image processing algorithm is adopted for this study to process X-ray&lt;br&gt; CT scanned images and effectively separate the connected or overlapping aggregates&lt;br&gt; using MATLABr 2018b, image processing toolbox. It includes for&lt;br&gt; both coarse and fine aggregate particles ranging from 1.18 mm to 19 mm. The&lt;br&gt; aggregate orientation, size and area can be used to define internal structure&lt;br&gt; parameters (i.e., modified Vector magnitude) to evaluate inherent anisotropy&lt;br&gt; of AC mixtures.&lt;br&gt; Aggregates have three dominant average orientations having 20% of the aggregates&lt;br&gt; has an inclination angle between (-10o-10o), 65% of the aggregates&lt;br&gt; have an inclination angle between (-45o-45o) and 15% of aggregates have&lt;br&gt; an inclination angle between (-45o-90o) for three AC mixtures. Small inclination&lt;br&gt; angle indicates the aggregates lies flat in the horizontal direction that&lt;br&gt; is perpendicular to the compaction direction. In addition, statistical analysis&lt;br&gt; was performed for AC mixtures within AC layers. It results, aggregate&lt;br&gt; orientation varies within AC layers. Variation of aggregates orientation is&lt;br&gt; performed using Scheffe multi-comparison test.&lt;/p&gt;</dct:description>
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