2010 Construction and Material Specifications - Ohio Department of ...

681
703.14
moisture. Ensure that the stockpile is maintained in a moist condition during the
required stockpiling period.
2. Ensure that the producer mixes the stockpile when the outside surface
of the pile has crusted over. The Department will inspect the stockpile every 2
months to ensure no crusting occurs. Do not mix frozen stockpile material.
Suspend the aging period when the stockpile is frozen for more than one month.
3. Ensure that this aging period is at least 6 months in duration and starts
over if any new material is added to the pile during the aging period.
C. Identification of OH Slag. Clear, definitive, and undisputable identification
of the OH slag is required.
The producer will show the Department evidence that the material supplied is
OH slag. This information will consist of, but is not limited to, the following:
1. Steel producer.
2. Production dates.
3. Production rates.
4. Stockpiling dates.
5. Type of steel produced.
6. All known Department and non-Department projects where the
material was previously used.
This identification of OH slag may be supplemented by other information
approved by the Department or by using 10 years of good performance data.
Ensure that the producer submits to the Department projects where the OH slag
has been used without expansion or tufa problems. The Department will review
the above projects as part of the identification approval process.
All OH slag not identified as OH slag will be considered BOF slag unless
otherwise identified.
D. Tufa Performance Verification of OH Slag. Tufa is a precipitate form of
calcium carbonate that can clog up the underdrain systems. Some OH slag sources
clog up underdrain systems and some do not. Tufa performance verification is
based on field performance and Department’s inspection of the underdrain
systems.
Tufa performance verification is required.
Ensure that the producer submits past projects that are at least 10 years old
that used the proposed OH slag source to the Department. Ensure that the
producer supplies the Department with construction plans with the underdrains and
underdrain outlets marked on the plans, or other suitable method, approved by the
Department, showing the underdrain system. Ensure that the producer marks the
underdrain outlets in the field for inspection. The Department will inspect the
underdrain systems for tufa deposits. If tufa deposits are found in the outlets or in
the underdrain system, the Department will reject the OH slag source.
E. Expansion Testing of OH Slag. After the aging and stock piling
requirements are met, expansion testing is required for OH Slag.