541WATERSTOPS

New Hampshire Department of Transportation Standard Specifications – 2016 Description

1.1This work shall consist of furnishing and placing waterstops in expansion, Contraction, and construction joints as shown or

ordered.

1.2Polyvinyl chloride types. Following are the basic types of PVC waterstops to be required under this specification:

Type Use Description NH #1 For construction joints through which the reinforcing steel extends, and no appreciable movements are expected. 3/16” min. thick by 4” min. wide, dumbbell or ribbed (split optional), no center bulb. NH #2 For contraction joints (keyed) without reinforcing steel or with shear steel only, where slight contraction and deflection movements are expected. 3/16” min. thick by 6” min. wide, dumbbell or ribbed (split optional), 1/4” min. I.D. by 1/2” min. O.D. center bulb. NH #3 For expansion joints (keyed) with 1/2” of cork filler, where nominal expansion, contraction, and rotational movements are expected. 3/16” min. thick by 6” min. wide), dumbbell or ribbed (split optional), 1/4” min. I.D. by 3/4” min. O.D. center bulb. NH #4 For expansion joints (not keyed) with 1/2 or 1” of cork filler, where appreciable expansion, contraction, rotational, and/or shear movements are expected. 3/8” min. thick by 9” min. wide, dumbbell or ribbed (split optional), 3/4” min. I.D. by 1-1/2” min. O.D. center bulb. NH #5 For lapping over the horizontal joint between the top of the abutment backwall and the bottom of the bridge deck haunch beam at the fixed end. 2-1/2” min. by 6” min. “ L” shaped, by 1/4” min. thick, ribbed on the 2-1/2” leg. 1.2.1 The use of waterstops with larger dimensions than those shown above will be permitted with approval of the Engineer. Materials

2.1PVC waterstops shall conform to the requirements of the United States Army Corps of Engineers Specification CRD -C 572

and shall be a product as included on the Qualified Products List. Construction Requirements

3.1The waterstops shall be installed and any necessary splicing made strictly in accordance with the manufactu rer’s

recommended procedure, the plans, or as directed. 3.1.1 When present, the PVC center bulb. shall be centered in the concrete joint. Method of Measurement

4.1Waterstops will not be measured, but shall be the linear foot final pay quantity in accordance with 109.11 for material required

as shown on the plans. Basis of Payment

5.1Waterstops are final pay quantity items and will be paid for at the Contract unit price per linear foot complete in place in

accordance with 109.11. Pay items and units:

541.1PVC Waterstops, NH Type 1(F) Linear Foot

541.2PVC Waterstops, NH Type 2(F) Linear Foot

541.3PVC Waterstops, NH Type 3(F) Linear Foot

541.4PVC Waterstops, NH Type 4(F) Linear Foot

541.5PVC Waterstops, NH Type 5(F) Linear Foot

New Hampshire Department of Transportation Standard Specifications – 2016

Description

This work shall consist of furnishing and placing reinforcement for concrete as shown on the plans or ordered.

1.1.1 Manufacturers of reinforcing steel must participate in, and maintain compliance with, the AASHTO National Transportation Product Evaluation Program (www.ntpep.org) that audits producers of reinforcing steel. Materials

Bar reinforcement shall be Grade 420 (Grade 60) or as shown on the plans.

2.1.1 Billet-steel bars shall conform to AASHTO M 31. 2.1.2 Rail-steel bars shall conform to AASHTO M 322M.

2.2Welded steel wire fabric shall conform to AASHTO M 55.

2.3Bundled reinforcement shall be used only as shown on the plans or with written permission.

2.4Epoxy Coated Reinforcing Steel.

2.4.1 Epoxy coated reinforcing steel shall meet the requirements of ASTM D3963. 2.4.2 A written certification by the manufacturer of the powdered epoxy resin attesting to the ASTM D3963 requirements shall be provided. 2.4.2.1 The certificate shall also contain the insignia or other similar statement that the plant is a currently approved fusion - bonded epoxy coating applicator, as defined by the Concrete Reinforcing Steel Institute (CRSI) Plant Certification Program. 2.4.3 The epoxy coating applied to the bars shall be uniform and smooth and shall provide a film thickness of 10 ± 2 mils after curing. 2.4.4 All chair and bar supports used for the installation of epoxy coated reinforcing bars shall be epoxy-coated, vinyl-coated, or plastic-coated wire bar supports. Plastic slab bolster bar supports may be utilized for installing epoxy coated reinforcing bars. Continuous plastic bar supports between the top and bottom mats are not acceptable.

2.5Synthetic Fiber Reinforcement. Synthetic fiber reinforcement shall be a product as included on the Qualified Products List.

Construction Requirements

Bar list. The Department’s bar list and bending schedule are made for the purpose of arriving at an estimate of quantities.

The Contractor shall verify the quantity, size, and shape of the bar reinforcement against the structure drawings and make the necessary corrections, if any, before ordering. Errors in the bar list and bending schedule shall not be cause for adjustment of Contract unit price.

3.2Surface condition of reinforcement. The reinforcing steel, at the time concrete is placed, shall be free of dirt, paint, oil, or

other organic materials that may adversely affect or reduce bond. Metal reinforcement coated with firmly bonded rust, mill scale, or a combination of both shall be considered satisfactory provided the minimum dime nsions and weight of a hand wire -brushed test specimen are not less than the applicable specification requirement. Rust or mill scale which is difficult to remove by vigorous scrubbing with a wire brush shall be considered firmly bonded to the steel.

3.3Bending. Unless otherwise permitted, all reinforcing bars shall be bent cold. Bars partially embedded in concrete shall not

be field bent except as shown on the plans or permitted. Only competent people shall be employed for cutting and bending, and proper appliances shall be provided for such work. Should the Engineer approve the application of heat for field bending reinforcing bars, precautions shall be taken to assure that the physical properties of the steel will not be materially altered.

3.4Placing and fastening. Reinforcing steel shall be free from mortar and other objectionable substances, shall be accurately

placed as shown or ordered, and shall be securely blocked and tied unless otherwise permitted. Blocking shall be by rust-resistant chairs unless otherwise permitted. Tack welding will be prohibited except upon special written approval of the Engineer. This provision also prohibits welding form ties to the reinforcement. 3.4.1 Reinforcing steel for bridge decks shall be epoxy coated unless otherwise shown on the plans. Bridge deck reinforcing steel shall be placed on epoxy or plastic- coated steel wire supports in accordance with 2.4 and the Concrete Reinforcing Steel Institute Manual of Standard Practice. The bottom reinforcing shall be supported on type SB supports with the end of the supporting wire lapped to lock the last legs of adjoining units. The top reinforcing shall be supported by type CHCU bar supports placed between the top and bottom mats. The ends of the top supporting wire shall be lapped. The supports shall be sized and spaced to allow for the minimum cover of the reinforcing bars called for on the plans. At least 50 percent of the junctions of the reinforcing mat shall be tied.