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Aggregate.JPG Various tests, including quality, freeze-thaw, and alkali-silica reactivity (ASR) are performed on aggregates used for road and bridge construction in Illinois. These tests quantify the physical characteristics of each aggregate product from each source. Development and evaluation of all statewide aggregate related policies, procedures and specifications are continually modified to keep them current with new technologies and test procedures. Aggregates focuses on: natural sands, gravels, crushed gravels, crushed stone, steel slag, air cooled blast furnace (ACBF) slag, recycled crushed concrete, rip rap, reclaimed asphalt pavement (RAP) used as aggregate.

Qualified Product List

Clicking a hot link below will take you directly to the qualified list for the material/product referenced in the title.


Below are reference materials to assist in getting materials approved and IDOT guidelines.


The following documents are provided as a tool to assist with identifying materials and/or ensuring that correct data is supplied to IDOT.

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Material Specific Information

There is currently no material specific information




Required technician training for Mixture Aggregate Technician and Aggregate Technician is described on the Lake Land College website.

Contact Us

Andrew Stolba
(217) 782-7086
Chief Geologist
Bureau of Materials 
Office of Highways Project Implementation

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