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Possible online services disruption due to Internet related outage

A worldwide technology outage is causing disruption to some State of Illinois online systems.  We are aware of this issue and are diligently working on restoration.

Agency Alert

Welcome to the new IDOT home page.  Our location has changed, please update any bookmarks.

Aggregate

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

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