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Aggregate Imaging Measurement System (AIMS) long presentation
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Highways for LIFE Aggregate Imaging Measurement System Project Outline
The Aggregate Imaging Measurement System (AIMS) characterizes aggregate shape properties related to pavement performance including Two and 3-D form, Coarse Aggregate Angularity, Fine Aggregate Angularity, and Texture properties.
Coarse Aggregate Form Characterization
Current techniques for evaluating flat and elongated aggregates (2-D form) include ASTM D4791 Standard Test Method for Flat Particles, Elongated Particles, or Flat and Elongated Particles in Coarse Aggregate.
This technique measures the length to width ratio of a material sample of coarse aggregates. Each particle is categorized by a length to width ratio individually
The AIMS characterizes a sample tray of coarse or fine aggregates providing a graphical output of the sample form distribution. Each sieve size is characterized separately.
This graph represents the AIMS 2D form distribution for several coarse aggregate samples.
This graph represents the AIMS 2D form distribution for several fine aggregate samples
The AIMS measures the 3-D shape of coarse aggregate samples. This shape information is reported as a sphericity index and plotted as a distribution.
This graph represents the AIMS Sphericity distribution for several coarse aggregate samples.
Coarse Aggregate Angularity
Current techniques for evaluating coarse aggregate angularity include ASTM D5821 Standard Test Method for Determining the Percentage of Fractured Particles in Coarse Aggregate.
This technique requires each particle to be viewed and the number of fractured faces per particle be counted
The AIMS characterizes a sample tray of coarse or fine aggregates providing a graphical output of the angularity distribution of the sample. Each sieve size is characterized separately.
The AIMS characterizes aggregate angularity using an angularity index value. Below is the AIMS angularity index values compared with the Krumbein images.
This graph represents the AIMS Angularity Index distribution for a #8 natural sand versus a #8 manufactured sand sample.
This graph represents the AIMS Angularity Index distribution for several coarse aggregate samples.
AIMS also characterizes the surface texture of coarse aggregate samples. Texture has been linked to pavement structural performance as well as pavement frictional properties.
The AIMS characterizes coarse aggregate texture with a Texture Index value.
This graph represents the AIMS Texture Index distribution for two coarse aggregate material samples.
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