582SLOPE PAVING

New Hampshire Department of Transportation Standard Specifications – 2016 Description

1.1This work shall consist of a paved area of concrete as specified constructed at the locations shown on the plans or as ordered.

Materials

2.1Concrete shall be Class A and conform to Section 520. The slump shall be 2 to 3”.

2.2Welded wire fabric shall conform to AASHTO M 55 (ASTM A 185) with a minimum gauge and spacing to be as shown in

accordance with the Concrete Reinforcing Steel Institute.

2.3Granular backfill shall conform to 209.2.1.2.

2.4Preformed Joint filler shall conform to AASHTO M 213.

Construction Requirements

3.1The Contractor shall set forms so that the concrete slabs as detailed are parallel to the centerline of the structure. Forms shall

allow for the outer 5 ft. to slope 1 ”. Concrete slab panel widths may vary from 5 to 30 ft. provided sections are of equal size and shall conform to the slopes as shown. No abrupt plan changes of horizontal joints w ill be permitted unless approved by the Engineer. Unless otherwise permitted, the Contractor shall pour alternating concrete panels to help reduce shrinkage cracking.

3.2Granular backfill shall be placed and compacted to assure a proper bed, as detailed.

3.3Welded wire fabric, of the type specified, shall be placed as detailed. Other wire fabric patterns may be substituted provided

an equal quantity of steel is supplied for each square foot of area. 3.3.1 The fabric shall be placed at least 3” from all concrete surfaces and need not be continuous through any joints, but must be lapped with a minimum edge lap of 3” or 1/2 mesh size and a minimum end lap of 6” or 1 mesh size.

3.4Preformed joint filler shall be placed along abutment or pier faces as detailed or ordered.

3.5After curing in accordance with 520.3.10.1, the entire surface shall be treated in accordance with Section 534 unless otherwise

ordered. Method of Measurement

4.1Slope paving, of the type specified, will not be measured, but shall be the square foot final pay quantities in accordance with

109.11for slope paving required as shown on the plans. Reinforcing fabric and preformed jo int filler will not be measured

Basis of Payment

5.1Slope paving, of the type specified, is a final pay quantity item and will be paid for at the Contract unit price per square foot

complete in place in accordance with 109.11. Excavation, paving material, reinforcing fabric and joint filler shall be subsidiary to slope paving of the type specified. 5.1.1 Granular backfill will be paid for under 209.1. 5.1.2 Concrete sealer will be paid for under Section 534. Pay item and unit:

582.1Slope Paving with Concrete (F) Square Yard

582.5Slope Paving with Granite Slabs (F) Square Yard

New Hampshire Department of Transportation Standard Specifications – 2016 9”

9”

1’-0”

SLOPE 1” IN 5’ ON OUTER EDGE (TYPICAL) 1’-0”

1’-0”

SLOPE PAVING WITH CONCRETE DETAILS 1” PREFORMED JOINT FILLER (SUBSID1ARY)

FACE OF ABUTMENT OR PIER

6” 6X6-W2.9XW2.9 WELDED WIRE FABRIC

GRANULAR BACKFILL - GRAVEL

CLASS A CONCRETE

6X6-W2/9XW2.9 WELDED WIRE FABRIC

6”

1” PREFORMED JOINT FILLER (SUBSID1ARY)

FACE OF ABUTMENT OR PIER

CLASS A CONCRETE

GRANULAR BACKFILL - GRAVEL

SLOPE AS SHOWN ON THE PLAN

SLOPE AS SHOWN ON THE PLAN

6”

EDGE SECTION

New Hampshire Department of Transportation Standard Specifications – 2016

Description

This work shall consist of furnishing and placing riprap as shown on the plans or ordered. Riprap is typically required for

erosion protection of bridge structures in waterways, for active waterway channel slopes and bottoms, and for intermittent waterway channels where the Engineer determines riprap protection is required to resist expected high water flow velocities. Materials

Riprap shall be quarry stone of approved quality, hard, durable, sub -angular to angular in shape, resistant to weathering and

free from structural defects such as weak seams and cracks. 2.1.1 The suitable shape of the individual stones shall be angular, meeting the gradation in 2.1.1.2 to create interlocking riprap to provide stability of the slope or channel. Round, thin and platy, elongated or needle -like shapes shall not be used. 2.1.1.1 The suitable riprap stone shape is determined by the Length to Thickness ratio, where Length is the longest dimension and Thickness is the shortest dimension, measured in perpendicular axes to each other. The suitable riprap stone shape shall have a length to thickness ratio of no greater than 3. 2.1.1.2 The gradation requirements of the riprap classes in Table 583-1 are based on the stone size Width, the largest dimension perpendicular to the Leng th and Thickness, and the distribution of stone sizes by volume. The volume distribution requires that 15 percent of the stone in the mass shall be no larger than the volume shown in the table (< 15% column), and 1 5 percent of the stone in the mass shall be no smaller than the volume shown in the table (> 85% column). The remaining 70 percent of the stone in the mass shall have a volume between these requirements, averaging to the volume shown in the table (15% - 85% column). None of the stones in the mass shall exceed the maximum volume shown in the table (Maximum column). Table 583-1 Riprap Classes and Sizes Percentage Distribution of Particle Sizes by Volume (cubic feet) Class Nominal Size (in) Maximum Size (in) < 15% 15% – 85% > 85% Maximum I 6 12 0.05 0.14 0.31 1.0 III 12 24 0.4 1.0 2.5 6.5 V 18 36 1.3 3.5 8.5 22 VII 24 48 3 8 19 53 IX 36 72 10 27 65 179 Note: Nominal Size and Maximum Size are based on the Width dimension of the stone. The riprap classes conform to the standard classes described in the FHWA HEC-23 publication. 2.1.2 The sources from which the stone is obtained shall be selected well in advance of the time when the material will be required in the field. The acceptability of the riprap stone shape and grading will be determined by the Engineer. 2.1.3 Control of the gradation will be completed by visual inspection approval by the Engineer of a stockpile at the quarry or other agreed site. Mechanical equipment as needed to assist in checking the stockpile gradation shall be provided by the Contractor. Stockpile replenishment will require re-approval.

Gravel blanket material shall conform to 209.2.1.2.

Geotextile shall conform to 593.2.

Construction Requirements

Preparation of slopes. Slopes that will be covered by riprap shall be free of brush, trees, stumps, and other organic material

and shall be graded to a smooth surface. All soft material shall be removed to the depth shown on the plans or as directed and replaced with approved material per 203.3.6. It is the Contractor’s responsibility to protect embankments and excavated slopes from erosion during construction of the riprap covered slope.

Gravel blanket construction. When called for o n the plans, the gravel blanket shall be placed on the prepared area to the

specified thickness in one operation, using methods which will not cause segregation of particle sizes within the layer. The surface of the finished layer shall be even and free from mounds or windrows.

Geotextile placement. Geotextile shall be placed in accordance with 593.3.

Riprap placement. Riprap shall be constructed to the dimensions shown on the plans or as directed by the Engineer.