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

469
613.06
The Contractor may use foundry sand if it meets the requirements of the
Division of Surface Water Policy 400.007 “Beneficial Use of Non-Toxic Bottom
Ash, Fly Ash and Spent Foundry Sand and Other Exempt Wastes,” and all other
regulations. Ten days before using a mixture containing foundry sand on the
project, submit written permission from the Ohio EPA to the Engineer. The
Contractor may elect to have an independent ODOT consultant pre-qualified in
remedial design environmental site assessment review the proposed usage. The
consultant will provide all documentation utilized to ensure that the proposed
usage obeys all Ohio EPA regulations. The consultant shall coordinate all EPA
required meetings, documentation, and testing requirements. The consultant shall
certify the report or reports to the Department.
Provide alternate mixes with an unconfined compressive strength between 50
and 100 pounds per square inch (345 and 689 kPa) at 28 days when tested
according to ASTM D 4832. Ensure that the long term (12-month) unconfined
compressive strength is less than 100 pounds per square inch (689 kPa).
Ensure that the final mix has the required strength, fills the voids of the intended
usages and sets up within 12 hours (4 hours for Type 3 or Type 3 alternate mixes).
The proportioning, yield, consistency, workability, compressive strength, and all
other requirements are the sole responsibility of the Contractor.
613.06 Mixing Equipment. Provide the mixing capacity and delivery
equipment to place the material without interruption as much as practical. Deliver
and place Type 1 and 2 mixes or Type 1 and 2 alternate mixes from ready mixed
concrete trucks, or deliver them from a batch plant.
Deliver and place Type 3 mix using volumetric mobile mixers. Calibrate
volumetric mixers properly and sufficiently mix the materials in the mixer to
produce a uniform material.
613.07 Mixing the Materials. Discharge the mixture within 2.5 hours after
adding water.
613.08 Placing Mortar. Unless specifically shown on the plans, do not place
the mortar within 3 (1 m) feet of the subgrade elevation. Discharge the flowable
material from the mixer by any reasonable means into the space of the plan
intended usage. Bring the fill material up uniformly to the fill line shown on the
plans. The Contractor may begin placing the other fill material over low strength
mortar backfill material as soon as the surface water is gone. The Engineer
reserves the right to reject the mix if a flowable mixture is not produced.
Before placing the low strength mortar backfill as backfill for 603 Conduit,
secure the conduit to prevent it from floating during placement of the flowable
material.
613.09 Method of Measurement. The Department will measure Low Strength
Mortar Backfill by the number of cubic yards (cubic meters) completed and
accepted in place, computed from the plan lines. The Department will not pay
additional compensation for over excavated areas or for a change in the material
blends.