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Introduction and History
IMI International Code Council (ICC) approval

What is ICC?
The ICC is responsible for producing the international building code which applies to commercial structures and the international residential code for one- and two-family dwellings. These are two separate codes that are established to replace the three individual building codes (UBC, SBC and BOCA) that existed in the U.S. up until 1997.

IMI ES Report
IMI has obtained what is called an ES Report. ES Reports are used for building materials that are not identified in the ICC commercial or residential codes. Steel fibers are not identified in the ICC codes currently. Therefore local building department officials use the ES Reports to approve the use of steel fibers in building components.

How was the ES Report obtained?
IMI began working toward this approval in 2005, and received notice of acceptance, June 2008. The first step in the process was to request and obtain change to AC 208 which allowed the use of steel fibers to replace temperature and shrinkage reinforcement in footings. The ICC uses AC reports as a basis for the said no requirements for obtaining ES Reports.

IMI had to produce information and testing requirements of AC 208 in order to obtain the ES Report. In addition, the manufacturer had to prepare and submit a quality plan for production of fibers in their Brazilian manufacturing plant. Once all these documents were prepared and ICC agreed to the content a physical audit was conducted at the Brazilian plant.

What is the purpose of the IMI ES Report?
The ES Report is essentially an extension of the building code. As long as construction follows the ES Report requirements, the local building inspectors will sign off on the construction. The main intent is to resolve rejections IMI was getting at local levels: city, county, state inspectors.

Scope contained in the IMI ES Report
Scope: This criteria applies to steel fibers used as an alternative to the shrinkage and temperature reinforcement specified in Section 1907.12 of the UBC and Chapter 7.12 of ACI 318-99 (IBC and IRC), for plain concrete slabs supported directly on the ground and concrete over composite steel decks. This criteria does not eliminate the requirement for joints specified in Section 1922.3 of the UBC, and Chapter 22.3 of ACI 318-99 (IBC and IRC), for plain concrete slabs supported directly on the ground. The steel fibers are used in addition to any specified structural reinforcement. The criteria calls for assessment of steel fiber properties, fiber effects on concrete strength and fiber contribution to concrete cracking resistance.

The ES Report is for use in non seismic zones only
The ES Report does not allow the substitution of steel fibers for reinforcing bar in seismic zones. There is a large seismic zone located at the intersection of Kentucky, Tennessee, Illinois, Missouri and Arkansas as shown on the map to the right. The yellow, orange and red colored areas are considered seismic zones.

Seismic zones
Colors on this map show the levels of horizontal shaking that have a 2-in-100 chance of being exceeded in a 50-year period. Shaking is expressed as a percentage of g (g is the acceleration of a falling object due to gravity.)