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   JMF Checklist

 

 
How do I get a JMF number?

If the JMF aggregate sources aren't on the internet, go to the JMF Checklist page for information and instructions to request a JMF number.

How long does it take to get a JMF number?

The length of time varies. To minimize JMF processing time, OMM should be contacted as soon as possible. The more complete and accurate the request, the more quickly it can be processed. For example, requests for one or more standard weight JMF numbers are typically processed in one day. JMF requests that involve mix design acceptance usually take longer; up to 3 days. Requests that involve more than one fine and coarse aggregate source usually take even longer; up to 5 days.

What if the JMF is wrong?

Verify the mix class and material components. If they differ from the requested information, or from ODOT specifications, contact OMM. Corrections are made immediately. The mix weights provided in the JMF are not adjusted for aggregate moisture or absorption. Those weight changes will be reflected on the concrete batch ticket provided to ODOT project personnel. Adjustments to the design weights are only allowed under specific circumstances listed under Item 499. Production issues should be reviewed with the Project Engineer in advance.

How long are JMF numbers valid?

PCC JMF numbers do not have an expiration date, specific term or duration. They are available for use until circumstances dictate their removal. Prior notification of a JMF's removal is not always possible. A periodic check of JMF status is recommended.

Do I need different JMF numbers for each of my company's plants?

If a ready mix company uses the same fine aggregate and coarse aggregate sources for all plant locations, the JMF numbers for respective, standard weight, classes of concrete will be the same. Classes of concrete previously referred to as Source-Specific, such as Fast Set and Moderate Set have JMF numbers for each batch plant (producer-supplier source) and aggregate combination.

Can a State General JMF be used on any ODOT Project?
Yes.
Are QC/QA JMF Numbers on the internet?

JMF numbers for QC/QA Concrete are not available on the internet. Copies are furnished to the ready-mix supplier,
independent lab and ODOT personnel shortly after approval. Additional copies and other information are
available upon request.

How do I get cylinder strength and other information?

Test data is now available on the CMS Portal. However, you must be registered. Contact the Cement & Concrete Section of OMM for instructions. 

How do I find certified material?

The OMM website contains lists of materials and their producer-suppliers. Other sources of information are the ODOT District Test Labs and Project personnel. If the material is not located on the websites, contact the supplier to verify the status of the material in question. If no ODOT acceptance can be provided, contact OMM. The following table provides links to assist you.

Instructions:
To use the table below, click on the Certified List Link or Qualified Product List (QPL) Link for corresponding material. Click on the specification titles to access certification or material requirements. 

Click the Materials Management Link to go OMM Home page.

 

Certification List

 
Material  Producer-Supplier Link  Link to Current Specifications
Aggregate Contact OMM Supplement 1069
Portland Cement Certified List Supplement 1028
Fly Ash Certified List Supplement 1026
GGBFS Certified List Supplement 1034
Micro-Silica Certified List Supplement 1045
Chemical Admixtures - Type A through G, and SCC QPL 705.12 2010 ODOT Construction&Materials Specification
Chemical Admixtures - Air Entraining QPL 705.10 Use 2010 ODOT C&MS Link 
Incidental or Miscellaneous Concrete Materials QPL 705.01 to 705.11 Use 2010 ODOT C&SM Link 
Is there a list of approved ready mix plants?
To see a list of PC Concrete and Bituminous Concrete plants that have been inspected within the last 12 calendar months, click CMS Portal. Select "Materials & Testing" . From the drop-down menu, select , "Approved Plants". Follow the prompts when directed.
What if my company changes material sources?

State General JMF Concrete Aggregate Changes:

Project documentation procedures vary across the state.  Always notify ODOT project personnel and the Office of Materials Management prior to making any changes. If the aggregate change effects standard weight classes of concrete like C, S and F (options 1,2 & 3), search the internet lists for the new fine-coarse aggregate combination for each concrete class. If the aggregate in question is not listed, then request the JMF through OMM or the District Test Lab. 

State General JMF Concrete Cementitious or Admixture Changes:

When cementitious material sources or types change, verify that the new sources are certified. Notify the District Test Lab of any changes. Browse the internet lists for JMF numbers. There may be instances where two JMF's of the same class of concrete will have the same fine and coarse aggregate sources, but different cementitious material classes or types. Each JMF number will be listed separately. For example, both Class C opt 1 JMF numbers C043071 and C0433359 have #57 gravel and natural sand from Barrett at West Carrollton, OH.  JMF number C043071 has class F fly ash and JMF number C043359 has class C fly ash. Contact OMM to identify cementitious material types.

Chemical admixtures are a required component of concrete, but do not appear in the State General JMF format. The same verification and notification steps should be taken with changes that involve chemical admixtures. Production issues should be discussed and approved by ODOT project personnel prior to use. 

SS 898 - QC/QA Concrete for Structures Material Changes:

A new QSC JMF number is required when changing material sources.  SS 898 - QC/QA Concrete for Structures requires retesting a mix if changing material type or size; such as limestone to gravel, #57s to #8s or grade 100 ggbfs to grade 120 ggbfs. 

A change in material source requires written certification that the changes will have no adverse effects on the tested mix. The new source must furnish approved material. 

Send a mix design to OMM reflecting the new source. Weight adjustments for changes in aggregate specific gravities must be documented in the new design. Modifying aggregate weights, excluding adjustments for specific gravity and absorption, by more than 3% will require retesting and approval.