for Highway Construction Page 526 of 715 SECTION 623 – CONCRETE SLOPE PAVING
623.01 Description.
Construct concrete slope paving around structures and on embankments.
623.02 Materials.
Provide materials for concrete slope paving as specified in 509. Provide No. 5 coarse aggregate for those portions of slope paving designated as exposed aggregate. Provide Class 22 concrete for slope paving with 4 to 7 percent entrained air. When colored concrete is specified, provide colorants and submit a color panel for approval. Where exposed aggregate slope paving is specified, submit the method of obt aining the finish and an exposed aggregate panel for approval. Provide preformed- expansion joint filler s as specified in 704.01. The Contractor may use sound cedar or redwood.
623.03 Construction Requirements.
Construct as specified i n 509. Grade the slope paving area and compact to 90 percent density as specified in 205. As soon as the desired exposed aggregate surface has been attained and washed, cure the concrete surface as specified in 509.
623.04 Method of Measurement .
The Engineer will measure acceptably completed work by the square yard of finished surface, measured in the plane of the finished surface.
623.05 Basis of Payment .
The Department will pay for the accepted quantiti es as follows: Pay Item Pay Unit Concrete Slope Paving ........................................................................... SY 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.