for Highway Construction Page 527 of 71 5 SECTION 624 – RIPRAP
624.01 Description.
Provide and place riprap. The Department will specify riprap size and placing method.
624.02 Materials.
Provide material as specified in: Riprap ...................................................................................................................................... 711.04
624.03 Construction Requirem ents.
When required, excavate the toe trench for riprap below probable scour elevation or to the elevation specified. Excavate the trench 2 feet below channel grade where scour elevation cannot be determined and elevation is not specified. Start by placing a course of the largest stones in the toe trench. Do not lay stone until the toe trench and slopes are approved. P lace riprap so the larger stones are in contact with each other and the voids are filled with the finer materials, producing a well -graded compact mass. Place the stone on the slope in a way that ensures the specified thickness in 1 operation. Do not disturb the underlying material when placing the riprap. Do not place in layers parallel to the slope.
624.04 Meth od of Measurement.
The Engineer will measure acceptably completed work by the ton or cubic yard of riprap.
624.05 Basis of Payment .
The Department will pay for the accepted quantities at the contract unit prices as follows: Pay Item Pay Unit Loose Riprap .......................................................................................... Ton or CY The Department will pay for excavation of toe trenches below the level of the intersection of the slope to be riprapped and the adjacent final ground or channel floor as specified in 210. Riprap /Erosion Control geotextile will be paid for as specified in 640. Preparation of the slope to receive riprap above the level of the intersection of the slope to be riprapped and the adjacent final ground or channel floor is incidental and the cost included in the riprap contract unit price. for Highway Construction Page 528 of 715 SECTION 625 – JOINTS
625.01 Description.
Provide and install joint material.
625.02 Materials.
Provide materials as specified in: Pre-formed Expansion Joint Filler ............................................................................................ 704.01 Joint Sealer for Asphalt and Concrete Pavements .................................................................. 704.02 Hot Poured Elastomeric Type Concrete Joint Sealer ............................................................... 704.03 Neoprene Compression Seal ................................................................................................... 704.04 Silicone Sealant ....................................................................................................................... 704.05
625.03 Construction Requirements.
Place pre- formed expansion joint filler accurately in the positions and to the lines and elevations specified. Firmly anchor the pre- formed expansion joint filler to the surface of the concrete on one side of the joint with 30-penny wire nails or 9- gauge wire cast into the concrete. Mix and apply hot poured s ealers as specified in the manufacturer’ s written instructions. Apply silicone sealant in accordance with the manufacturer's written instructions. Clean Joints . Properly repair spalls or breaks before sealing. Instal l neoprene compression seal s by first coating the sealer and/or the sides of the joint with the adhesive lubricant. Push the sealer down so it is at least ¼ inch and no more than ⅜ inch below the surface of the bridge dec k at the edge of the joint and at least ⅛ inch and no more than ¼ inch below the surface of concrete pavement at the edge of the joint. Install the joint material to extend from edge to edge of the slab in one continuous length. Do not stretch the seale r more than 8 percent of its original length during installation.
625.04 Method of Measurement.
Not specified.
625.05 Basis of Payment .
Providing the material and performing th e specified work is included in the structure or pavement contract items.