830 - SLOPE PROTECTION 800-82
830.1 Description
Construct slope protection on bridge berms, fill slopes and channel banks as shown in the Contract Documents. B I D I T E M S U N I T S Bedding for Slope Protection Cubic Yard Slope Protection (*) (**) (***) Cubic Yard Slope Protection (Gabion) Cubic Yard Slope Protection (Special) Cubic Yard Geotextile Fabric Square Yard *Type: aggregate, shot rock or riprap stone **Thickness ***Grouted, when specified
830.2 Materials
Provide materials that comply w ith the applicable requirements. Grout ..................................................................................................................... DIVISION 400 Aggregate that complies with Stone for Aggregate Ditch Lining ......................... DIVISION 1100 Stone ...................................................................................................................... DIVISION 1100 Bedding that complies with Type III Stone for Filter Course ............................... DIVISION 1100 Type 2 Liquid Membrane-Forming Compound .................................................... DIVISION 1400 Geotextile Fabric ................................................................................................... DIVISION 1700 Unless prohibited in the Contract Documents, and when approved by the Engineer, the Contractor may use concrete rubble entirely or in combination with the material designated in the Contract Documents. If concrete rubble is substituted for the aggregate or stone designated in th e Contract Documents, the Engineer will waive the quality requirements, and will determine compliance with the gradation requirements by visual inspection. Provide concrete rubble that is broken concrete from existing structures. Remove asphalt overlays and patches on the deck of the structure before the concrete is rubblized. Cut off and remove all protruding reinforcing steel in the concrete rubble. The maximum dimension of the slope protection or concrete rubble in any direction shall not exceed the thickness shown in the Contract Documents. Large flat pieces of concrete rubble are prohibited.
830.3 Construction Requirements
Construct the bridge berms, fill slopes and channels to the lines and grades shown in the Contract Documents. Prepare for the slope protection by undercutting the finished berms, slopes and channels to the depth necessary for the slope protection. After the slope protection is completed, backfill and compact around the structure. Construct the slope protection to the lines and grades shown in the Contract Documents. A tolerance of +6 inches from the slope lines and grades is allowed. Underlay the slope protection with geotextile fabric at the locations designated in the Contract Documents. Provide the Engineer with a copy of the manufacturer’s recommendation. Install and secure the geotextile fabric as recommended by the manufacturer. Replace any geotextile fabric damaged or displaced during construction. Place the bedding for the slope protection at the locatio ns designated in the Contract Documents. Place the bedding in its full course thickness in one operation, using methods of placement that will not segregate the material. The finished surface of the bedding shall be uniform. Compaction of the bedding is not required. Place the slope protection the full course thickness in one operation. Do not us e methods of placing the rocks that will segregate the various sizes of rocks. Do not use heavy equipment (working upon the slope 830 - SLOPE PROTECTION 800-83 protection) to the spread the rocks. Do not place oversized ro cks on the slopes. Place the slope protection to produce a reasonably well-graded mass of rocks with a minimum amount of voids. The finished slope protection shall be free of pockets of small rocks and clusters of larger rocks. Rearrange individual rocks (by hand or mechanical equipment) to the extent necessary to obtain a reasonably well-graded distribution of rock sizes. When designated in the Contract Documents, pour co ncrete grout over the slope protection to fill all the voids. Apply Type 2 liquid membrane-forming compound as the curing medium. Apply the curing medium immediately after the concrete surface is finished, and before the set takes place. Maintain the cure for 7 days. In cold weather, maintain the concrete temperature above 32°F for the first 4 days of the 7 day cure period
830.4 Measurement and Payment
The Engineer will measure the bedding for slope protection and slope protection by the cubic yard. The Engineer will measure the geotextile fabric by the square yard to the limits of the bedding for slope protection. Payment for "Bedding for Slope Protection", "Slope Protection" and "Geotextile Fabric" at the contract unit prices is full compensation for the specified work.
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