STATE OF OHIO
DEPARTMENT OF TRANSPORTATION
SUPPLEMENT 1071
QUALITY CONTROL REQUIREMENTS FOR STEEL SLAG AGGREGATE
PRODUCER/PROCESSORS
April 19, 2002
1071.01
1071.02
1071.03
1071.04
1071.05
Background
Scope
Steel Slag Quality Control Plan
Quality Control Requirements for Steel Slag Producers/Processors
Test Methods
1071.01 Background. Steel slag aggregates are recognized to provide a durable skid
resistant asphalt pavement. However, unique circumstances in steel slag production as a
byproduct of steel making and subsequent byproduct stockpiling necessitates unique
requirements on the producers and processors of steel slag as a material for use in asphalt
concrete pavements. The steel slag byproduct retrieved by a steel slag processor may
come readily from the steel slag production process or come from older byproduct
stockpiles or pits. These requirements assure the Department of proper attention to these
unique variables and that quality steel slag aggregate is used in Ohio’s pavements.
1071.02 Scope. The steel slag processor is responsible for processing raw slag into
aggregate sizes complying with the applicable specification. Achieving quality steel slag
aggregate for use in hot mix asphalt requires consistent application of steel slag producer
and processor quality control. The quality control must start from the steel making
process and continue through the processing of steel slag into an asphalt concrete
pavement. These requirements cover the quality control plans of producers of steel slag
and/or processors of steel slag and are required prior to shipment of any steel slag to
Department projects.
1071.03 Steel Slag Quality Control Plan. The processor of steel slag is required to
submit to the Laboratory for approval a Steel Slag Quality Control Plan that, at a
minimum, covers the requirements in this specification. Additions to the plan beyond
these requirements are at the processors discretion. This plan is necessary for the direct
supplier of steel slag aggregate. When a steel slag processor submits a plan, the plan
must include the quality control plan of the steel slag producer if material is retrieved
from readily produced steel slag from the steel slag producer. The plan must be updated
and submitted for approval every two years or earlier if any item of the plan has been
modified. The plan shall designate two individuals (and include phone numbers) who are
responsible for carrying out the details of the plan and who have authority to make
process changes or cease steel slag processing if problems are seen.
1071.04 Quality Control Requirements for Steel Slag Producers/Processors. The
following items are required as a part of the processor quality control plan. The producer
quality control is required when steel slag is readily retrieved by the processor from the
producer steel slag production process.
1071.041 Producer Quality Control. The producer quality control shall include the
following:
1.
2.
3.
4.
5.
Designation of those responsible for carrying out the quality control at the
steel making facility.
Designation of separate quality control for each furnace (BOF, EAF, etc)
at the facility.
Method of handling (such as material pile separation, handling etc.)
extreme variations in steel slag makeup due to major changes in practice
(furnace operation).
Change in practice (furnace operation) of steel slag quality control
responses to the processor.
Location of all quality control documentation.
1071.042 Processor Quality Control. The processor quality control plan shall include
the following:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Documentation of producer quality control for steel slag being processed
but not originating from older byproduct stockpiles.
Designation of older byproduct stockpiles from which steel slag is
recovered with site maps.
Rejection/selection process for suitable steel slag.
Designation of all rejected/selected steel slag stockpiles with site maps.
Disposal method and location of rejected stockpiles.
Initial processing method when steel slag is removed from older byproduct
stockpiles for removal of metallics, etc.
Steel slag aggregate processing and testing (including testing frequency)
verifying actual steel slag quality.
Final processing method including equipment type, plant layout, storage
sites or any other items pertaining to the operation.
Product verification testing (including testing frequency) for gradations,
absorption, percent soft pieces including lime agglomerations and other
suitable steel slag quality testing at the processors discretion during final
processing.
Reprocessing procedure for failing material with retests and location of
failed stockpiles.
Site plan of processed stockpiles by size.
Minimum one month aging at moisture content greater than aggregate
absorption. If, after aging, fine aggregate has crusted or other tests show a
problem for coarse or fine aggregate, reprocessing or screening is
required.
12.
13.
Moisture test prior to shipping according to customer requirements and
documented on shipping records.
Location of all quality control documentation.
1071.05 Test Methods. The following test methods are considered acceptable for
required or optional testing of steel slag aggregate:
Method
Frequency
Deleterious substances (703.05 using hand Every 2000 tons minimum
crushing for soft pieces); Supplement 1029
Gradation; ASTM C 136
Every 2000 tons minimum
Absorption; Supplement 1031
Every 2000 tons minimum
Loss by washing, ASTM C 117
1 per week minimum
Autoclave disruption, on file at the Laboratory
Optional
Expansion test (percent maximum at 7 days), on Optional, using ASTM D 4792 on
file at the Laboratory
fine aggregate, 1.5 percent expansion
as guide limit