Section 4109 Revised 10172023.pdf
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- Attached to
- Broken Concrete Crushing (4 Sites)
- Solicitation number
- 645-RFQ-1883-2025
- Issued by
- Warren County, Iowa
About this file
The document is a technical specification from the Iowa Department of Transportation (Iowa DOT), specifically Section 4109 on Aggregate Gradations, revised on 10/17/2023. The document defines and provides guidelines for aggregate materials used in construction, distinguishing between coarse aggregate (particles retained on the No. 4 or larger sieve) and fine aggregate (particles passing the No. 4 sieve). While the document is technical in nature, it provides detailed instructions for handling, stockpiling, and evaluating aggregate materials.
The specification outlines strict requirements for aggregate quality, including provisions for rejection of materials contaminated with foreign substances or not meeting quality standards. Key provisions include prohibiting driving on PCC (Portland Cement Concrete) aggregate stockpiles, restrictions on using ramps in stockpile construction, and giving engineers the authority to assess material acceptability through visual examination or other methods. The document references additional Aggregate Gradation Tables in an appendix and cites Article 1106.04 for further unacceptable material guidelines, emphasizing the importance of material purity and proper handling in construction aggregate preparation.
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Text version
Section 4109 | Revised 10/17/2023 https://www.iowadot.gov/erl/current/GS/content/4109.htm#Section410902[9/17/2024 11:24:08 AM]
Section 4109. Aggregate Gradations
4109.01 DESCRIPTION.
A. Coarse Aggregate Particles retained on the No. 4 or larger sieve.
B. Fine Aggregate.
Particles passing the No. 4 sieve.
4109.02 GRADATION.
Refer to the Aggregate Gradation Tables in the Appendix.
4109.03 UNACCEPTABLE MATERIALS.
A. Article
1106.04 applies. Stockpiles contaminated with organic or other foreign materials may be cause for rejection of the aggregate.
The Engineer will determine acceptability by visual examination or other methods.
B. The Engineer may reject the use of material from ledges or beds that individually do not pass the quality requirements for the intended aggregate product. Specific production methods may be required to permit the use of material from marginal ledges or beds.
4109.04 STOCKPILING OF AGGREGATE.
A.
For PCC aggregate, driving on stockpiles is not considered an acceptable production or handling practice and may be grounds for rejection of the stockpile.
B.
For all other aggregate stockpiles, if a ramp (incline or decline) is used to build the stockpile the ramp cannot be used as certified material. Incorporation of a ramp into a stockpile may be grounds for rejection of the stockpile.
https://www.iowadot.gov/erl/current/GS/content/Appendix.htm https://www.iowadot.gov/erl/current/GS/content/1106.htm#Section110604
| iowadot.gov |
| Section 4109 | Revised 10/17/2023 |
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