608SIDEWALKS

New Hampshire Department of Transportation Standard Specifications – 2016 Description

1.1This work shall consist of constructing sidewalks of either hot bituminous pavement, or Portland cement concrete, reinforced

when specified. Portland cement concrete sidewalks shall receive a protective coating unless otherwise directed.

1.2Detectable Warning Devices. This work shall consist of furnishing and installing a detectable warning surface and

accessories on sidewalk ramps at locations shown on the plans, as specified herein, or as ordered including any and all required surface preparation. Detectable warnings shall be installed at sidewalk ramps where a sidewalk crosses a vehicular way, excluding unsignalized driveway crossings. Detectable warnings shall measure 24” in the direction of travel and extend the full width of the sidewalk ramp and the edge nearest the curbline shall be located 6 to 8” from the face of curbline.

Materials

2.1Base course materials shall conform to the class of materials as specified in the plans.

2.2Portland cement concrete shall be Class A conforming to Section 520.

2.2.1 Coarse aggregate shall be standard size #67. 2.2.2 Protective coating shall be Silane/Siloxane conforming to Section 534.

2.3Reinforcement. Synthetic fiber reinforcement shall conform to 544.2.5.

2.4Joint filler shall conform to AASHTO M 213.

2.5Hot bituminous pavement shall meet the material requirements of Section 401 except that the composition of mixtures shall

conform to the limits of Table 608-1. Table 608-1 - Composition of Mixtures - Master Ranges English Binder Course Wearing Course Sieve Size Percentage by Weight Passing ½” 95 – 100 --- 3/8” 90 – 100 98 - 100 No. 4 45 – 75 80 - 100 No. 8 32 – 53 45 - 70 No. 16 22 - 41 30 - 51 No. 30 14 - 33 21 -38 No. 50 8 - 25 13 - 27 No. 200 2 – 6 2 - 6 Asphalt Cement Percent of Mixture 5.5 - 7.5 6 - 9

2.6Detectable Warning Devices.

2.6.1 Detectable warning devices shall be gray cast iron conforming to AASHTO M105 and AASHTO M306. 2.6.2 Cast iron panels shall have no surface coating, and shall be allowed to transition to their natural patina. 2.6.3 Detectable Warning Panel Truncated Dome Geometry. 2.6.3.1 Detectable warning devices shall be in full compliance with ADA Accessibility Guidelines (ADAAG) (Title 49 CFR Transportation, Part 37.9 Standard for Accessible Transportation Facilities, Appendix A, Section 4.29.2 – Detectable Warning on Walking Surfaces). 2.6.2.2 Size and spacing for truncated domes shall be as follows: base diameter o f nominal 0.9”, top diameter of nominal 0.4”, height of nominal 0.2”, with a center to center spacing of nominal 2.35”. 2.6.2.3 The truncated domes shall be arranged in a grid pattern and shall align properly from panel to panel.

New Hampshire Department of Transportation Standard Specifications – 2016 Construction Requirements

3.1Bituminous Sidewalks.

3.1.1 Subgrade and base course. The subgrade shall be carefully graded and compacted. The base course material shall be spread and rolled to a smooth surface and to the required cross-section. 3.1.2 General. The plant, mixing methods, and hauling shall conform to the provisions of Section 401. 3.1.2.1 The compacted binder course shall be 1” less in thickness than the total thickness of the sidewalks. 3.1.2.2 The compacted wearing course shall be 1” in thickness. 3.1.3 Placing. The bituminous pavement shall be spread uniformly in two courses as specified above. Each course shall be rolled with a roller weighing between 500 lb. and 2,000 lb. The finished surface shall be uniform in appearance, free from irregularities, and shall present a smooth surface. The edges shall be trimmed as directed. 3.1.4 Backfilling. The edges of the sidewalk shall immediately be backfilled as necessary with suitable material compacted and finished flush with the top of the sidewalk.

3.2Concrete Sidewalks.

3.2.1 Excavation shall be made to the required depth and to a width that will permit the installation and bracing of the forms. The foundation shall be shaped and compacted to a firm, even surface conforming to the section shown on the plans. All soft and yielding material shall be removed and replaced with acceptable material. 3.2.2 Forms shall be of wood or metal and shall extend for the full depth of the concrete. All forms shall be straight, free from warp, and of sufficient strength to resist the pressure of the concrete without springing. Br acing and staking of forms shall be such that the forms remain in both horizontal and vertical alignment until their removal. 3.2.3 The foundation and granite curb shall be thoroughly moistened immediately prior to the placing of the concrete. Any standing water shall be removed before the concrete is placed. The proportioning, mixing, and placing of the concrete shall be in accordance with 520.3. 3.2.4 Reinforcement. Reinforcing steel in reinforced concrete sidewalk shall be placed at mid -depth or as sh own on the plans, using the methods described in 544.3. Synthetic fiber reinforcement shall be evenly distributed throughout using methods described in 544.3. 3.2.5 Finishing. 3.2.5.1 Concrete shall be finished by use of wood, or magnesium floats, by skilled concrete finishers. A fine-grained broom finish shall be applied to all concrete sidewalks subject to foot traffic. 3.2.5.2 All outside edges and expansion or construction joints shall be edged with an edging tool having a radius of 1/4 ”. All crack control joints in sidewalks subject to foot traffic shall be edged with a jointing tool. 3.2.6 Joints. 3.2.6.1 Construct transverse and longitudinal crack control joints by sawing, jointing tool or other approved method to a minimum depth of one third the slab thickness. If the jointing tool is not capable of constructing a joint to the correct depth, saw the joint to the correct depth. Saw crack control joints as soon as concrete has hardened sufficiently to permit sawing with out excessive raveling and before uncontrolled shrinkage cracking occurs, usually between four and twenty four hours. Control joints for cracking shall be spaced at 8 ft. and 12 ft. for slab thickness of 4” and 6” respectively, unless otherwise specified. Form crack control joints every 5 ft. in sidewalks subject to foot traffic. Bond breaker shall be used at all construction joints. 3.2.6.2 Expansion joints shall be formed at any angles or intersections in the sidewalks, around all appurtenances such as manholes, utility poles and catch basins, and between buildings or bridges. Preformed expansion joint filler of the thickness indicated shall be installed for the full depth of the slab. 3.2.7 Curing. Concrete shall be cured for a minimum of 7 days. Curing compounds will not be pe rmitted unless otherwise approved. Plastic sheets or other approved materials shall be placed in close contact with the finished concrete as soon as the concrete has set sufficiently to avoid damage from the placement of coverings. The protective coverin g shall be maintained vapor-proof in close contact with the concrete for the entire 7 day period unless otherwise approved. All traffic shall be excluded during the curing period. Vehicular traffic shall be excluded for such additional time as ordered. 3.2.8 Protective coating. Protective coating shall be applied in accordance with 534.3.

3.3Detectable Warning Devices.

3.3.1 The Contractor shall submit manufacturer’s descriptive literature for materials specified in accordance with 105.02.

New Hampshire Department of Transportation Standard Specifications – 2016 3.3.2 Transport, storage, and handling of products shall be in accordance with manufacturer’s instructions. 3.3.3 Install detectable warning devices and any anchoring hardware in accordance with manufacturer’s instructions. Panels shall be set into a bed of 4” wet unreinforced concrete. 3.3.4 Use a combination of available panel widths as manufactured to cover the full sidewalk ramp width to the extent practicable. Field cutting of panels is not permitted. 3.3.5 Care shall be taken to ensure the safety of pedestrians when sidewalks must remain in service during construction. Method of Measurement

4.1Sidewalks will not be measured, but shall be the square yard final pay quantities in accordance wi th 109.11 for sidewalks

required as shown on the plans. The area occupied by the curb will not be included in the final pay quantity. 4.1.1 Protective coating will not be measured.

4.2Base course material will be measured by the cubic yard determined by the product of the area and depth of sidewalk approved

for payment shown on the plans or ordered.

4.3Detectable Warning Devices will be measured by the square yard to the nearest 0.1 of a square yard.

Basis of Payment

5.1Sidewalks are final pay quantity items and will be paid for at the Contract unit price per square yard complete in place in

accordance with 109.11. 5.1.1 Protective coating for concrete sidewalks will be subsidiary.

5.2Base course material will be paid for as shown on the plans.

5.3Necessary excavation will be paid for under Section 203.

5.4Detectable Warning Devices w ill be paid for at the C ontract unit price per square yard com plete in place including

accessories, anchoring hardware and any required surface preparation.

Pay items and units: 608.1 _in Bituminous Sidewalk (F) Square Yard 608.2 _in Concrete Sidewalk (F) Square Yard 608.3 _in Reinforced Concrete Sidewalk (F) Square Yard

608.54Detectable Warning Devices, Cast Iron Square Yard

New Hampshire Department of Transportation Standard Specifications – 2016

Description

This work shall consist of constructing or resetting curbs as shown on the plans or as ordered.

Materials

Curb shall be new granite, salvaged granite, or bituminous, as indicated in the proposal.

Granite shall be hard, durable, reasonably uniform in appearance, and free from weak seams. Solid quartz or feldspar veins

will not be cause for rejection. 2.2.1 Surfaces of each stone shall be finished in accordance with the requirements of Table 609-1. All comparable curbs on the project shall have similar finishes. 2.2.2 When the slope curb item description does not indicate a specific height, the size of the stone shall be as shown on the standard entitled “ Granite Slope Curb ”. The setting reveal (the vertical height of the exposed face when set) shall be 4 ” or as shown on the plans.

Salvaged granite curbing shall be dressed to obtain joints of the same width as specified for new curb.

Table 609-1 Finished Surfaces and Tolerances for Granite Curbing Type Area Finished Surface Tolerance, Inchesa Straight or Curved Top 5” wide or as otherwise shown, sawn true plane. +1/8 -1/8 Front and back arris lines pitched straight and parallel. +1/8 -1/8 Front face Right angle to top, approximately true plane. No drill holes showing in top 10”. +1 -1/2 Back face: Exposed Plane parallel with front face. Straight split to 1-1/2” below exposed surface. No larger than 1/4” segment of drill holes showing in arris lines. +1 -1 Concealed Below 1-1/2” from exposed surface. +1-1/2 -1-1/2 Bottom Approximately parallel to top. Minimum width: 3” See plans. Ends: Exposed Square with planes of top and face. Joints: Exposed Optimum width: 1” Concealed To break back no more than 4” +3/4 -3/4 Lengths of stones 3 to 10 ft. with 50 percent of sections to be 5 ft. or greater, or as indicated.