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JMF-Introduction-pg.htm
Section Task

 

Website Instructions

Welcome to the Office of Materials Management (OMM) PCCJMF website. If you are familiar with Job Mix Formulas (JMF's), select PC Concrete JMF List on OMM Home page. The PCC JMF link on this page contains a brief explanation of the list page format.
Novice users or those who would like basic information about JMF's should read the text on this page before proceeding. 
The FAQ section and JMF Checklist pages contain information about JMF's that will be helpful to both novice and experienced users.

 

Who to Contact

If you have questions that are not answered in the FAQ section, contact the Cement & Concrete Section of the ODOT Office of Materials Management:  by telephone at (614) 275-1326 or fax (614) 351-5559.

 

Links
 
bullet Frequently Asked Questions - JMF FAQs
bullet Portland Cement Concrete JMF's  - PCC JMF
bullet Information Needed to Request a JMF - JMF Checklist

 

Concrete Classes

ODOT has about 20 classes of Portland Cement Concrete.  Mixes can be found in the ODOT Construction and Material Specifications under Item 499 Concrete - General. Others are associated with Supplemental Specifications like 847 and 848 for bridge deck overlays.  

JMF Information
State General Materials is a term that refers to certified, cementitious materials such as fly ash, cement and ground granulated blast furnace slag (ggbfs) used in Portland Cement Concrete (PCC.) Job MIx Formulas (JMF's) of ODOT classes that have standard, "spec weights" incorporate this term as a producer/supplier source of cementitious materials. This JMF format or category, also referred to as, "State General" represent classes whose numbers are available on the internet.
JMF Numbers
State General JMF's are associated with fine aggregate; usually natural sand, and a specific size of limestone, gravel or slag coarse aggregate. This identification process offers concrete suppliers the ability to select the correct JMF number without the redundancy of multiple numbers reflecting different cementitious sources. There will be instances when two JMF's of the same class of concrete have the same fine and coarse aggregate sources, but different coarse aggregate sizes.  Each JMF number will be listed separately. They may not be used interchangeably.

 

INFORMATION NOTICE
Every effort is made to provide JMF numbers that contain approved and certified concrete materials. JMF numbers on the internet reflect certified suppliers and material at the time the JMF was established. The status may change at any time. It is recommended that concrete suppliers, contractors and others that do business with ODOT verify the status of their materials before requesting or using a JMF number. This link to a Certification List  of typical concrete materials is in the FAQ section.

 

Source-Specific JMF's
Some JMF's require a concrete producer/supplier code that identifies the plant name and location. Moderate Set and Fast Set Concrete are examples of another JMF format referred to as Source-Specific. Because there are no standard weights for these classes, a JMF will represent an approved design and material sources that meet ODOT requirements. For privacy, internet lists of Moderate Set or Fast Set JMF numbers aren't available.
QC/QA JMF's
Another Source-Specific, JMF format exists for Quality Control/Quality Assurance (QC/QA) Concrete. QSC JMF's are assigned to Ready-Mix concrete suppliers. Each QSC1, QSC2 or QSC3 JMF number represents distinct material components, sources and proportions. Test data from an independent lab is required for approval. It is essential that all service or material providers have a thorough understanding of QC/QA Specification and Project requirements.  Questions can be directed to OMM Cement and Concrete Section.  It is advisable to consult the project engineer regarding production or quality control issues.
Special JMF's
Project Plan Notes or Special Provisions may call for a concrete mix to meet certain requirements. The JMF format is Source-Specific and may be limited to use for a specific project or construction method. In such cases, a mix design must be submitted for approval. Test data from an independent lab may also be required.