611.17 519 Three -Sided Flat Topped Culvert, ___' (___ mm) Span ___' (___ mm) Rise 611 Foot (Meter) Type ___Precast Reinforced Concrete Arch Sections, ___' (___ mm) Span ___' (___ mm) Rise 611 Foot (Meter) Type ___ Precas t Reinforced Concrete Round Sections, ___' (___ mm) Span ___' (___ mm) Rise 611 Foot (Meter) ___' (___ mm) Rise ___' (___ mm) Span Conduit, Type A Corrugated Steel Box Culvert, ___' (___ mm) Minimum Cover, ___' (___ mm) Maxi mum Cover 611 Foot (Meter) ___' (___ mm) Rise ___' (___ mm) Span Conduit, Type ___Corrugated Aluminum Box Culvert, ___' (___ mm) Minimum Cover, ___' (___ mm) Maximum Cover 611 Foot (Meter) ___" (___ mm) Conduit, Type ___, with Field Paving of Pipe 611 Foot (Meter) ___" (___ mm) Conduit, Type ___, Field Paving of Existing Pipe 611 Foot (Meter) Conduit, Type F for underdrain outlets 611 Each Manholes 611 Each Inlets 611 Each Catch Basins 611 Each Inspection Wells 611 Each Junction Chambers 611 Each Manhole, Catch Basin or Inlet Reconstructed to Grade 611 Each Manhole, Catch Basin, or Inlet Adjusted to Grade 611 Each Precast Reinforced Concrete Outlet ITEM 613 LOW STRENGTH MORTAR BACKFILL
613.01 Description
613.02 Materials
613.03 Mix Proportioning
613.04 Mix Adjustment
613.05 Alternate Mixes
613.06 Mixing Equipment
613.07 Mixing the Materials
613.08 Placing Mortar
613.09 Method of Measurement
613.10 Basis of Payment
613.01 520 613.01 Description. This work consists of placin g a low strength mortar backfill around conduits and at other locations. Perform the work for this item according to Items 611 and 499, except as modified below.
613.02 Materials. Furnish materials conforming to:
Cement ................................ ................... 701.01 or 701.04 Fly Ash ................................ ................................ ... 701.13 Furnish fine aggregate consisting of foundry sand, natural sand, sand manufactured from stone, gravel, or air -cooled blast furnace slag. Conform to the fine aggregate gradation requirements of 703.05. Use fine aggregate that is fine enough to stay in suspe nsion in the mixture to ensure proper flow. Furnish an air -entraining admixture that is designed for use in low strength mortar mixtures (also called controlled density fill or flowable fill).
613.03 Mix Proportioning. Furnish a low strength mortar mixture listed below
or provide an alternate mix conforming to 613.05. TABLE 613.03 -1 Type 1[1] Type 2 Type 3 lb/yd³ kg/m³ lb/yd³ kg/m³ lb/yd³ kg/m³ Cement 50 30 100 59 0 0 Fly Ash, Class F 250 148 [2] [2] 1500 890 Fly Ash, Class C [4] 0 0 0 0 297 297 Fine Aggregate [3] 2910 1726 2420 1436 0 0 Water (Target) 500 297 210-300 125-178 850 504 [1] The Contractor may add an air -entraining agent specifically designed for the use in the low strength mortar mixture. [2] Entrained air is substituted for fly ash in this mix. (Approximately 25 percent) [3] Saturated Surface Dry [4] Class C Fly Ash may be substituted for Class F Fly ash in Type 1 mixes with an approved mix design meeting the alternate mix design criteria of this specification. These mixtures o f materials are expected to yield approximately 1 cubic yard (1 m3) of material of a flowable consistency. Make small adjustments, as necessary, in the amounts of the materials in a mix to achieve the final product.
613.04 Mix Adjustment. Make one or more 1 cubic yard (1 m3) trial batches at
different water contents to ensure a flowable material. The mixture is too dry if cracks develop in the mixture as it flows into place. Adjust the proportions to maintain the total absolute volume. For large adjustments , see 613.05. In order to expedite the settlement of a Type 1 mixture without entrained air, bleed water may appear on the surface immediately after the material is struck off. A delay in bleeding indicates there are too many fines in the mixture. The Cont ractor may reduce the fly ash quantity in increments of 50 pounds (30 kg) until the mixture is bleeding freely. Add approximately 60 pounds (36 kg) of sand to replace each 50 pounds (30 kg) increment of fly ash to maintain the original yield. 613.05 521 613.05 Altern ate Mixes. The Contractor may submit alternate mixes for approval. Furnish the mix design and test data from an independent test laboratory 30 days before the intended usage for approval. Submit an alternate mix design for all mixes that:
A.Vary more than 300 pounds (178 kg) in fine aggregate, 100 pounds (59 kg) in water, 20 pounds (12 kg) in cement, or 200 pounds (119 kg) in fly ash from the
613.03 mixes. These are considered large adjustments.
B.Have less than 50 pounds (30 kg) of cement in the Type 1 m ixes or less than 100 pounds (59 kg) of cement in the Type 2 mixes.
C.Use alternate materials.
D.Contain foundry sand.
E.Contain fly ash not conforming to 701.13.
F.Use fine aggregate gradations other than 703.05. 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 provi de 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 De partment. 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, w orkability, 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 m aterials in the mixer to produce a uniform material.
613.07 Mixing the Materials. Discharge the mixture within 2.5 hours after
adding water.
Source: Ohio Construction and Material Specifications, 2019 Edition. Pages 0–0 of 928.