605.01 Description. This item shall consist of the construction
of concrete ditch paving, according to these specif ications and in conformity with the locations, lines, and grades sh own on the plans, or as directed.
605.02 Materials. The concrete shall comply with Section 802
for Class M Concrete. The Department will perform all acceptance sampling and testing at the frequencies shown for C ontractor acceptance testing in Subsection 802.06. When required, reinforcing steel shall comply with Section 804. Curing materials shall comply with Subsection 501.0 2(i).
605.03 Construction Requirements. (a) Subgrade. The
subgrade shall be excavated or filled to the requir ed grade. Soft and yielding material shall be removed and replaced wit h suitable material and the entire subgrade shall be thoroughl y compacted.
b.Forms. Forms shall be constructed of metal or wood, free from warp, and of sufficient strength to resist spr inging during the process of depositing concrete. They shall be secu rely staked, braced, set, and held firmly to the required line a nd grade. Forms shall be cleaned and oiled before concrete is place d against them. As an alternate to stationary forms, the Contractor may use a slip form paver method with a template matching the plan configuration of the ditch paving.
c.Placing and Finishing. The concrete shall be deposited in the forms upon a wetted subgrade to such depth that when it is compacted and finished, the flow line shall be at t he required elevation and the sides at required widths, slopes, and thicknesses. The concrete shall be thoroughly compacted and the edges along the 420 forms spaded to prevent honeycomb. The flow lines and sides shall be struck off with a straightedge and tamped suffic iently to flush mortar to the surface, after which it shall be fini shed with a wood float to a smooth and even surface. Edges shall be rounded with a 1/4" (6 mm) edger. Transverse joints shall be cut with a 1/4" (6 mm) j ointer at intervals not greater than 5' (1.5 m) measured long itudinally along the flow line. When completed, the concrete shall be cured as spec ified in Section 501.
d.Backfilling. Immediately after the forms have been removed, the spaces on each side of the paving shal l be backfilled with suitable material, compacted with mechanical e quipment, and solid sod placed to the top of the ditch paving. T he Contractor shall be responsible for any damage to the ditch paving a nd the area adjacent to the ditch paving that occurs before the solid sod is placed. All such damage shall be repaired by the C ontractor at no cost to the Department.
e.Expansion Joints. When a section of ditch paving terminates at a drop inlet or other structure, a space not les s than 1/2" (12 mm) wide shall be left between the end of the paving an d the structure. This space shall be filled with joint filler comply ing with AASHTO M 213.
f.Placement on Slopes. Slope paving shall begin at the toe of the slope and be constructed to the lines and dimen sions as shown on the plans or as directed.
605.04 Method of Measurement. Concrete Ditch Paving
constructed within the limits shown on the plans or as directed will be measured by the square yard (square meter) of ex posed surface. 421 605.05 Basis of Payment. Work completed and accepted and measured as provided above will be paid for at the contract unit price bid per square yard (square meter) for Concre te Ditch Paving of the type specified, which price shall be full co mpensation for furnishing materials, including joint filler; for c onstructing the concrete ditch paving; for excavation and backfilli ng; and for all labor, equipment, tools, and incidentals necessary to complete the work. Payment will be made under: Pay Item Pay Unit Concrete Ditch Paving (Type___) Square Yard (Square Meter)
Source: , Edition.