The Table of Contents for this section is available.
The work covered by this section consists of the construction of concrete rip rap or plain rip rap in accordance with the requirements of the plans and these specifications and at the locations designated on the plans or directed by the Engineer.
Concrete rip rap shall consist of poured concrete slabs reinforced in accordance with the details shown on the plans.
Plain rip rap shall consist of quarry run stone, or field stone, or broken concrete, and shall be classified by size into either Class 1 or Class 2. Plain rip rap when classified as either Class A or Class B shall consist of quarry run stone or field stone. The class and thickness to be used shall be as called for on the plans. A filter fabric shall be placed under plain rip rap where called for by the plans.
All materials shall meet the requirement of Division 10 shown below:
Portland cement concrete Section 1000
Curing agents Section 1026
Joint fillers Article 1028-1
Wire mesh reinforcement Article 1070-3
Plain rip rap Section 1042
Filter Fabric Article 1042-2
Concrete shall be constructed in accordance with Section 825, except as otherwise provided herein. Class B concrete shall be used. Reinforcement shall be furnished and placed as shown on the plans and in accordance with the provisions of Section 425.
Immediately before placing concrete the slope shall be properly shaped and firmly compacted so that it conforms to the required lines and grades.
After the concrete has been placed it shall be struck off to plan grade and finished to a dense and uniform surface. The finished surface shall be reasonably smooth and uniform and shall not vary more than 1/2 inch in a distance of 10 feet.
Joints shall not be sealed.
Backfill shall be compacted to a degree comparable to the adjacent undisturbed material.
Unless otherwise directed by the Engineer, the stone shall be placed on a slope as indicated on the plans. The stone shall be graded so that the smaller stones are uniformly distributed throughout the mass.
The Contractor may place the stone by mechanical methods, augmented by hand placing where necessary, provided that when the rip rap is completed it forms a properly graded, dense, neat layer of stone.
The completed rip rap shall be at least the thickness indicated on the plans. Toe walls and other construction details shall be as indicated on the plans.
At locations where rip rap is required for channel changes and drainage ditches, the rip rap shall be placed prior to diverting the water into the channel changes and drainage ditches.
At locations where rip rap is required at the outlets of pipe culverts, the rip rap shall be placed immediately after completion of the pipe culvert installation.
Surfaces to receive filter fabric shall be graded to the lines and grades shown on the plans, unless otherwise directed by the Engineer. The surface shall be free of obstructions, debris, and pockets of soft or low density material.
At the time of installation, the fabric will be rejected if it has defects, rips, holes, flaws, deterioration, or damage incurred during manufacture, transportation, or storage.
The fabric shall be laid smooth and free from tension, stress, folds, wrinkles, or creases. Horizontal overlaps shall be a minimum of 12 inches with the upper fabric overlapping the lower fabric. Vertical overlaps shall be a minimum of 18 inches with the upstream fabric overlapping the downstream fabric. In the event that the fabric is displaced or damaged during rip rap placement, the rip rap shall be removed and the fabric repositioned or replaced prior to replacement of the rip rap, all at no additional cost to the Department.
The placement of the fabric and rip rap shall be performed in a continuous manner as directed by the Engineer. The fabric shall be protected from damage due to the placement of rip rap or other materials limiting the height of drop of the material or by placing a cushioning layer of sand on top of the fabric before dumping the material.
No more than 72 hours shall elapse from the time the fabric is unwrapped to the time the fabric is covered with rip rap or sand.
(A) Square Yard:
The quantity of rip rap to be paid for will be the actual number of square yards of rip rap, measured along the surface of the completed rip rap, which has been completed and accepted. Measurement of toe walls for concrete rip rap will be made by converting the volume of concrete in the toe wall to an area of rip rap of uniform thickness having the same volume.
(B) Ton:
The quantity of rip rap to be paid for will be the actual number of tons of each class of rip rap which has been incorporated into the completed and accepted work. The rip rap will be measured by being weighed in trucks on certified platform scales or other certified weighing devices.
(C) Filter Fabric:
The quantity of filter fabric to be paid for will be the area in square yards, measured along the surface of the ground, over which fabric has been acceptably placed.
(A) Concrete Rip Rap:
The quantity of concrete rip rap, measured as provided in Subarticle 8685(A), will be paid for at the contract unit price per square yard for "Concrete Rip Rap".
(B) Plain Rip Rap:
The quantity of plain rip rap, measured as provided in Subarticles 8685(A) or 8685(B), will be paid for at the contract unit price per square yard or per ton for "Plain Rip Rap, Class________". The unit of measurement to be used will be that called for in the contract.
(C) Filter Fabric:
The quantity of filter fabric, measured as provided in Subarticle 8685(C), will be paid for at the contract unit price per square yard for "Filter Fabric for Drainage."
(D) Compensation:
The above prices and payments will be full compensation for all work covered by this section including but not limited to all excavation, embankment preparation, and backfilling; and furnishing and placing concrete, reinforcement, stone or broken concrete rip rap, filter fabric, and other materials.
(E) Basis of Payment:
Payment will be made under:
Concrete Rip Rap Square Yard
Plain Rip Rap, Class________ Square Yard
Plain Rip Rap, Class________ Ton
Filter Fabric for Drainage Square Yard