609CURBS

New Hampshire Department of Transportation Standard Specifications – 2016 Description

1.1This work shall consist of constructing or resetting curbs as shown on the plans or as ordered.

Materials

2.1Curb shall be new granite, salvaged granite, or bituminous, as indicated in the proposal.

2.2Granite 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.

2.3Salvaged 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.

New Hampshire Department of Transportation Standard Specifications – 2016 Type Area Finished Surface Tolerance, Inchesa Bridge Conform to Straight Curb except as specified below.

Exposed surfaces No drill holes showing; none in back face arris lines.

Bottom Width equal to width of top. +1/2 -1/2 Joints: Exposed Maximum width: 1/2”

+1/4 Concealed Split face to break back no more than 1” Slope and End Stone Arris lines Straight and true on top, front and ends. Drill holes not deeper than 1/4” allowed in arris lines. +1/4 -1/4 Faces: Exposed

Planes; no drill holes in faces longer than 8” or deeper than 1/4” +1 -1 Concealed Drill holes not objectionable. Ends Square with face except as indicated. Joints On tangent, maximum width: 1” On curves over 15 ft. radius, widen top or bottom from 1” as necessary. +1/2 -1/2 On curves with 15ft. radius and under, use radial joints or curved curb as indicated. Optimum width: inch +1/2 -1/2 Length of stones Min. and max. specified lengths. See plans.

a + Projection in stone; -Depression in stone Table 609-2 - Required Grading For Bituminous Curb Sieve Size Percentage by Weight Passing 3/4” 100 1/2” 86.0 - 100 3/8” 75.0 - 100 No. 4 60.0 – 80.0 No. 8 42.0 – 62.0 No. 16 30.0 – 49.0 No. 30 22.0 – 39.0 No. 50 14.0 – 27.0 No. 200 3.0 – 10.0 Asphalt Cement, percent of Mix 7.0 - 9.0

2.4Bituminous curb shall meet the requirements of Section 401 except that the composition of the mixture shall conform to the

limits of Table 609-2. The mixture shall extrude properly with a uniform, smooth appearance. 2.4.1 Polyester fibers, as included on the Qualified Products List, shall be uniformly incorporated in the dry mix in the proportion of approximately 1/4 percent of the total batch weight. 2.4.2 Curb paint shall be Ready -Mixed White or Yellow Traffic Paint in conformance with either 708 -NH 4.11 or 708-NH 4.12, respectively. 2.4.3 Beads for reflectorization shall conform to Section 708.

New Hampshire Department of Transportation Standard Specifications – 2016

2.5Cement mortar shall conform to Section 707 except that cement mortar for bedding curb (bridge) shall be an approved

non-shrink, non-metallic grout mixed as recommended by the manufacturer. The non-shrink, non-metallic grout shall be a product as included on the Qualified Products List. When the bedding is more than 3/4” in height, a 3/8” washed stone may be mixed into the mortar at the maximum of 1 part stone to 4 parts dry mortar.

2.6Curb anchors shall be zinc -coated (galvanized) steel in accordance with ASTM A 653 , coating designation G 90 of shapes

and dimensions as shown on the plans.

2.7Backfill material shall conform to the appropriate material shown on the plans.

Construction Requirements

3.1Granite Curb.

3.1.1 Excavation for curb shall be made to the required depth, and the base upon which the curb is to be set shall be compacted to a firm even surface. 3.1.2 Installation of curbing shall be so that the front top arris line conforms to the line and grade required. All spaces under the curbing shall be filled with material conforming to the requirements for roadway base course. This material shall be thoroughly tamped. 3.1.3 Joints shall be of the width i ndicated in Table 609-1. The y shall be pointed with mortar and the exposed portions finished with a jointer. 3.1.4 Backfilling shall be accomplished immediately after the curb is set and jointed. Backfill shall be of approved material, placed and thoroughly tamped. 3.1.4.1 Concrete Class A in accordance with Section 520 may be substituted for aggregate base course and hot bituminous base courses in the curb patch on the roadway side of granit e curb. Concrete thickness shall be not less than that of the adjacent pavement. 3.1.5 Bridge curb shall be set on a mortar bed of non- shrink, non-metallic grout. The front face shall be plumb and the top shall conform to the required line and grade. Al l joints shall be grouted and the exposed portions finished with a jointer. Long and short lengths of curb shall be laid alternately unless otherwise ordered. 3.1.5.1 Curb anchors shall be set and grouted as shown on the plans.

3.2Bituminous Curb.

3.2.1 Prior to placing the curbing, the surface of the pavement shall be cleaned as directed and painted with a tack coat of bituminous material when ordered. 3.2.2 The curbing shall be placed by means of an approved extruding curb paver. The curbing shall be c ompacted to a minimum density of 90 percent of a laboratory compacted sample of the same mix. A tight bond shall be obtained between the prepared course and the curb and between necessary curb joints. 3.2.3 When painted curb is specified, the exposed surf aces of the curbing shall be painted with two coats of curb paint in accordance with the paint manufacturer’s recommendations after a curb curing period that shall be as long as project conditio ns permit, but no sooner than seven days. Primer and finish c oats shall be applied at a rate to obtain a wet t hickness of 16 mils each application. The finish coat is intended to serve as the vehicle for holding the beads for reflectorization. 3.2.4 The beads for reflectorization shall be applied by the drop -on method at the time of application of the second coat of paint, evenly and uniformly, at the rate to obtain the adhesion of the maximum number of beads possible. Dead spots found upon testing after dark shall be repainted and additional beads applied.

3.3Reset Granite Curb.

3.3.1 Curbing to be reset shall be carefully removed and stored. The Contractor shall replace any curbing damaged or lost because of his negligence. All exposed portions of reset curbing shall be cleaned by sand blasting. Method of Measurement

4.1Curb will be measured by the linear foot to the nearest 0.1 of a foot from end to end along the lower edge of the exposed face

of the curbing. Only curbing actually cut to a radius will be considered as curved curb. Slope curb shown or ordere d to be cut on radial joints, (not square with face) will be measured separately. 4.1.1 No separate measurement will be made for storage if necessary or sandblasting of reset curb . 4.1.2 Curb for salvage shall be as provided for in Section 202.

New Hampshire Department of Transportation Standard Specifications – 2016 Basis of Payment

5.1The accepted quantities of curb will be paid for at the unit price per linear foot for each type of curbing specified, complete

in place, except that all special cutting ordered due to changes in the plans will be paid for as provided in 109.04.

5.2Roadway base course material adjacent to the curb will be paid for under the appropriate items and no deduction will be

made for the volume occupied by the curb. In the process of setting the curb, excavation and backfill of the material that has been placed by the Contractor will be considered as incidental to the item.

5.3Hot bituminous base courses placed adjacent to the curb for a maximum width of 1 ft. will be paid for unde r Item 403.12.

Concrete Class A substituted for aggregate base course and hot bituminous base courses will be paid for under Item 403.12 at 2.0 tons per cubic yard. Pay items and units:

609.01Straight Granite Curb Linear Foot

609.02Curved Granite Curb Linear Foot

609.21Straight Granite Slope Curb Linear Foot

_ Straight Granite Slope Curb _inch High Linear Foot

609.22Straight Granite Slope Curb with Radial Joints Linear Foot

_ Straight Granite Slope Curb with Radial Joints

_in High Linear Foot

609.23Curved Granite Slope Curb Linear Foot

_ Curved Granite Slope Curb _inch High Linear Foot

609.3Straight Granite Curb (Bridge) Linear Foot

609.311 Straight Granite Curb (Bridge), Modified Linear Foot

609.35Curved Granite Curb (Bridge) Linear Foot

609.5Reset Granite Curb Linear Foot

609.51Setting Granite Curb Furnished by Others Linear Foot

609.55Reset Granite Curb (Bridge) Linear Foot

609.811 Bituminous Curb, Type B 4” Reveal Linear Foot

2 Bituminous Curb, Type A Linear Foot

New Hampshire Department of Transportation Standard Specifications – 2016

Description

This work shall consist of furnishing, installing and testing conduit of the size and type specified, including sweeps, bends ,

joints, hangers, pull boxes, special fittings, plastic warning tape and other appurtenances, as shown on the plans or ordered. Sawed pavement, common structure excavation to the depth specified in 206. 4.1, bedding if required, and backf ill shall be included in this work. This work shall also include the disposal of discarded materials and the restoration of disturbed surfaces when not otherwise included under other items in the Contract. Materials

Steel conduit and steel conduit for sleeves shall conform to ASTM A 53 Standard Weight and shall be galvanized unless

otherwise specified.

Plastic Conduit.

2.2.1 Electrical plastic tubing (EPT) and electrical plastic conduit (EPC) including fittings and joint shall be made from polyvinyl-chloride (NEC 352) or polyethylene (NEC 353) and shall conform to NEMA TC 2 or NEMA TC 7. Conduit shall be marked in accordance with NEMA TC 2-6.1. 2.2.2 Only water tight fittings supplied or recommended by the manufacturer shall be used. 2.2.3 When the item description calls for Plastic Conduit (material is not specified) either PVC or polyethylene shall be furnished and shall meet the requirements of 2.2.1.

Concrete for cast in place conduit encasement shall conform to Section 520, Class B. Precast concrete encased conduit will

not be permitted.

Plastic warning tape shall be American Public Works Association standard 6” wide polyethylene color coded and marked in

accordance with the utility industry standards for marking underground utility lines.

Concrete pull boxes, either precast or cast in place, shall be constructed using concrete conforming to Section 520, Class A

and designed for AASHTO H20 loading. Frame and cover castings shall be gray iron conforming to AASHTO M 105. Unless otherwise specified, all gray iron castings shall be Class 30. Covers shall be secured to the frame with two stainless steel hex head bolts conforming to ASTM A 240 Type 304. Pull boxes and covers shall be constructed as detailed on the plans.

Molded pull boxes shall be either fiberglass -filled high density polyethylene (HDPE), fiber reinforced polyester mortar, or

fiberglass cloth reinforced polymer concrete, all with high impact resistance, ultraviolet stabilization tested per ASTM G53 and Chemical resistant tested per ASTM 543 section 7. The box and cover shall be designed for off roadway applications subject t o incidental, non-deliberate heavy vehicular traffic in accordance with the Western Underground Committee Guide 3.6 for non- concrete enclosures (WUC Guide 3.6). Boxes and covers shall be tested with the cover in place. 2.6.1 The cover shall withstand a vertical test load of 20,800 lb. applied at the center of the cover, by a 10” x 10” plate, with less than 1/2” deflection over 10 test cycles. The boxes shall withstand a vertical box wall test load of 20,800 lb. applied by a 10” x 10” plate with a 5” x 10” area centered on the long wall with no mo re than 1/4” deflection per foot of length of enclosure over 10 test cy cles. Boxes shall also withstand a lateral sidewall test load of 1,200 lb. per square foot applied by a plate 24 ” by the depth of the box, with no more than 1/4” deflection per foot of length of enclosure over 10 test cycles. Tested in accordance with Section 4.1 of WUC Guide 3.6. Permanent deflection of any surface shall not exceed 10 percent of the maximum allowable static test load deflection. 2.6.2 Enclosures shall be designed and suitable for installation and use through a temperature range -40º F to 195º F 2.6.3 Covers, boxes and extensions shall meet the acceptance criteria in accordance with Section 5.3 of WUC Guide 3.6. A spray or paint covering shall not be used to achieve the required nonflamability. 2.6.4 Boxes and extensions shall have adequate soil bearing surface to prevent settling in any soil, when tested in accordance with Section 4.1 of WUC Guide 3.6. 2.6.5 Covers and extensions shall be interchangeable with other boxes of the same material type an d size manufactured to WUC Guide 3.6. 2.6.6 Any point on the covers shall withstand a 70 lb(f)-ft. impact administered with a 12 lb. weight using a “ C” TUP (ASTM D-2444) without puncturing or splitting. The test shall be performed with the cover resting upon a flat, rigid surface such as concrete or a 1” steel plate. 2.6.7 Cover surface shall provide a minimum coefficient of friction of 0.50. Covers shall be secured to box with two hex- head stainless steel bolts conforming to ASTM A 240 Type 304. Bolts shall be self -retaining and shall withs tand a minimum of