538BARRIER MEMBRANE

New Hampshire Department of Transportation Standard Specifications – 2016 Description

1.1This work shall consist of furnishing and applying an approved waterproof membrane system as shown on the plans or as

ordered.

1.2When “Barrier Membrane, Heat Welded ” or “ Barrier Membrane, Heat Welded – Machine Method ” is specified, the

Contractor shall arrange for a manufacturer’s representative (Representative) to be present at all times work is performed, including application of the primer and tack coat. The Representative shall also be present for placement of the hot bituminous pavemen t overlay. The Rep resentative shall be readily identified by a photo ID badge, issued by the manufacturer, that includes the manufacturer’s name and logo, a current photograph of the Representative, the Representative’s full name, and the word “ Representative”. The text o f the badge shall be clearly printed in English. The Representative shall have the badge on his/her person and available for inspection at all times work is performed under this specification. 1.2.1 In performing work under this specification, the Contr actor shall anticipate and provide for quality assurance testing and inspection by the Engineer or his/her authorized representatives. 1.2.2 When” Barrier Membrane, Heat Welded – Machine Method” is specified, the machine shall meet the requirements of 538.3.3.3.1. Materials

2.1Barrier membrane, Peel and Stick.

2.1.1 “ Barrier membrane, Peel and Stick” and “ Barrier membrane, Peel and Stick – Vertical Surfaces” shall consist of adhesive primer, preformed waterproofing membrane sheet and mastic all as one system as included on the Qualified Products List.

2.2Protection board shall be a product as included on the Qualified Products List.

2.3Barrier Membrane, Heat Welded.

2.3.1 “Barrier Membrane, Heat Welded ” shall consist of an approved prefabricated reinforcement of synthetic non -woven material, thoroughly impregnated and coated with SBS modified bitumen as included on the Qualified Products List. When machine method is specified, the membrane system shall be listed as such on the Qualified Products List. 2.3.2 The system shall include a primer that enhances the adhesive bond between the concrete deck and the membrane, and a tack coat that enhances the bond between the membrane and the hot bituminous pavement overlay , all as included on the Qualified Products List. 2.3.2.1 When approved in writing by the membrane manufacturer, a tack coat meeting the requirements of 410.2.1 may be used in lieu of the tack coat that is listed on the Qualified Products List. 2.3.3 Hot-applied rubberized asphalt for sealing the curb line shall be a product as included on the Qualified Products List. Construction Requirements

3.1General.

3.1.1 Concrete shall be cured in accordance with the requirements of 520.3.10. The prime r and membrane shall only be applied when the substrate surface has a moisture content of 6 percent or less, and when the temperature of the substrate exceeds the dew point by at least 5º F. The Contractor shall supply a portable electronic surface moistu re meter capable of measuring the moisture content of concrete surfaces in percent. The moisture meter shall be a product that is listed on the Qualified Products List and shall be calibrated annually by the meter manufacturer. A certificate of calibration from the meter manufacturer shall accompany the moisture meter. The Contractor shall also supply a digital weather instrument that can measure both ambient temperature and dew point, and an infrared surface temperature measuring instrument. 3.1.2 The air temperature and the substrate temperature shall be at least 40 ºF and rising.

3.2Barrier Membrane – Peel and Stick.

3.2.1 Preparation of the surface. The concrete surface shall have a uniform, fine-textured finish that is free of protrusions. All honeycombed areas and surface cavities shall be cleaned and filled with approved patching materials. The surface to be membraned shall be clean and free of laitance, oil and foreign materials. 3.2.2 Application of adhesive primer. Immediately prior to application of the primer, the surface shall be cleaned by brooms and compressed air. The concrete surface shall be inspected and approved by the Engineer prior to priming. 3.2.2.1 The adhesive primer shall be thoroughly mixed before use and applied by roller only and allowed to cure in accordance with the manufacturer’s recommendations.

New Hampshire Department of Transportation Standard Specifications – 2016 3.2.3 Application of membrane. Membrane shall be installed in a shingled pattern so that water is permitted to drain without accumulating against seams. The membrane shall be pressed or rolled into place to assure bond with the primed surface and elimination of air bubbles. Lap joints at the beginning and end of rolls shall be staggered with those of adjacent rolls and shall be sealed in accordance with the manufacturer’s recommendation. 3.2.3.1 All expansion joints, areas around drains, all membrane junctions with curbs, end dams, protrusions, and all inside corners shall receive an extra 6” wide strip of preformed membrane prior to normal coverage. 3.2.3.2 Torn or damaged membrane shall be repaired in accordance with manufacturer’s recommendations. 3.2.3.3 Membraned surfaces to be backfilled against, including horizontal surfaces of box culverts and rigid frames, shall be protected from rupture by a protection board as listed on the Qualified Products List.

3.3Barrier Membrane – Heat Welded.

3.3.1 Preparation of the surface. The surface of the deck shall have a uniform fine -textured finish. In lieu of patching, surface cavities shall be ground to form a smooth transition across the deck surface as directed by the Engineer. 3.3.1.1 The entire deck shall be shot -blasted using self -contained, self-propelled equipment to achieve a consistent anchor profile that is free of sharp protrusions. Abrasive media shall consist of a blend of shot and grit sufficient to provide an angular surface profile that meets the requirements of 3.3.1.1.2. Areas that are not accessible to self-propelled shot blasting equipment, as determined by the Engineer, shall be blasted with appropriate equipment utilizing either mineral grit or steel grit and air p ressure sufficient to achieve the specified surface profile. 3.3.1.1.1 Suitable traps shall be installed in shot- blasting equipment to prevent foreign substances from being deposited on the surface. 3.3.1.1.2 The Contractor shall provide a copy of Technical Guideline No. 03732, published by the International Concrete Repair Institute including the benchmark profile coupons. The final concrete surface profile shall be between CSP 3 and CSP 5 as defined by this Guideline. 3.3.1.2 Prior to primer application, the surface shall be clean and free of laitance, oil and foreign materials. Tightly adhered membrane residue, which cannot be removed by scraping using heavy pressure, may be left in place. All fabric reinforcement from previous membrane systems must be completely removed. 3.3.1.3 The concrete surface shall be inspected and approved by the Engineer and the Representative prior to priming. 3.3.1.4 The Contractor shall perform moisture testing of the deck surface using a Contractor -supplied portable electronic surface moisture meter as described in 3.1.1. Moisture tests shall be performed at locations as determined by, and in the presence of, the Engineer. The Contractor shall determine the substrate temperature and dew point using Contractor-supplied digital instruments as described in 3.1.1. The primer shall only be applied when the moisture content of the substrate surface is 6 percent or less and when the temperature of the substrate exceeds the dew point by at least 5° F. Special attention shall be given to assure that there is no moisture present at the interface between the deck and bridge curb. The Engineer may perform additional moisture testing of the substrate. 3.3.2 Application of adhesive primer. The handling of components shall be performed in a safe manner as per manufacturer’s recommendations. Avoid the use of an open flame near freshly applied primer. 3.3.2.1 The primer and membrane shall be applied by a manufacturer certified applicator (Applicator). Applicators shall be individuals who have been thoroughly trained, by the manufacturer, in all aspects of application of the membrane system. Although an individual may be certified as both Applicator and Representative, the individual shall not serve in both capacities at th e same time. Upon certification, the manufacturer shall issue a badge to the Applicator that includes the manufacturer’s name and logo, a current photograph of the Applicator, the Applicator’s full name, and the word “ Applicator”. The text of the badge shall be clearly printed in English. When machine method application is specified, the machine shall be operated by an Applicator who is certified to operate the machine. This certification shall be indicated on the Applicator’s badge. The Applicator shall have the badg e on his/her person and available for inspection at all times work is performed under this specification. 3.3.2.2 Immediately prior to application of the primer, the deck shall be cleaned by brooms and oil -free compressed air. 3.3.2.3 The primer shall be applied in one coat that thoroughly covers the entire surface to be membraned. The minimum primer application rate shall be 200 ft2/gal. The primer shall be applied by brush, roller or sprayer. 3.3.2.4 The primer shall cure tack -free before application of the waterproofing membrane. Additional priming may be required depending on the surface conditions and the time between priming and application of the membrane.

New Hampshire Department of Transportation Standard Specifications – 2016 3.3.3 Membrane application. The waterproofing membrane shall be heat welded onto the prepared substrate. Care shall be taken to assure that the membrane is completely bonded to the primed surface. The Contractor shall be responsible for protection of adjacent areas. 3.3.3.1 When machine method is specified, the machine shall be capable of handling rolls of at least 100 square yards. The machine shall be self-propelled and shall be capable of automatically following the edge of the previously placed membrane. To minimize end-of-roll joints, only one partial roll of membrane will be allowed per bridge deck phase. 3.3.3.2 Membrane shall be installed in a shingled pattern so that water is permitted to drain to the low areas of the deck without accumulating against seams. Laps shall be staggered at the beginning and ends of rolls and shall overlap the end of the previous roll by at least 6 ”. Membrane shall overlap the side edge of adjacent rolls by at least 3 ”. All laps shall be completely heat-sealed. 3.3.3.3 Prior to suspension of work for any reason, all exposed edges shall be heated, troweled and sealed to assure that moisture cannot get under the membrane edge. 3.3.3.4 During application, a bead of melted bitumen should be visible at the leading edge and side edges of the membrane roll, providing a visual confirmation that all surface voids have been filled and the membrane is fully adhered to the substrate. 3.3.3.5 At the curb line, the membrane shall be heat-welded to within 1” of the curb. The curb shall be protected to prevent damage or permanent discoloring of the curb. The remaining area between the edge of the membrane and the curb, includi ng the sloped fillet below the curb, shall be completely sealed with hot- applied rubberized asphalt material meeting the requirements of

2.3.3The hot-applied rubberized asphalt material shall be applied so as to form a complete seal below the curb

3.3.3.6 Damaged membrane and adhesion test locations shall be patched or repaired in accordance with manufacturer’s recommendations and with guidance from the Representative. 3.3.4 Application of tack coat. The membrane to be coated shall be clean and free f rom loose debris, moisture, or other contaminants. The Contractor shall take all necessary precautions to eliminate damage or contamination to the membrane system by vehicular traffic or by the spillage of gasoline, oil, diesel fuel, grease, hydraulic fluid or other deleterious substance. Contaminants shall be removed as per manufacturer’s recommendations and with guidance from the Representative. Any material damaged by contaminants or during cleaning shall be cut out and the damaged area repaired in accordance with 3.3.3.6. 3.3.4.1 Membrane surfaces that have been tacked shall be paved within 48 hours of application of the tack coat. 3.3.5 Application of hot bituminous overlay. The deck shall be paved within 3 days of membrane application unless otherwise permitted by the Engineer. The required laydown temperature of pavement overlays used in connection with heat - welded barrier membrane shall be between 290° F and 330° F. It should be noted that the laydown temperatures are extremely critical in order to preserve membrane integrity. 3.3.5.1 Prior to paving, any blisters found in the applied membrane shall be repaired with guidance from the Manufacturer’s Representative, as per manufacturer’s recommendations. Typical treatment may consist of puncturing the bubble with a torch - heated pick inserted at an approximate angle of 45 degrees. A similar treatment may be necessary if bubbles appear after application of the pavement base course. Method of Measurement

4.1Barrier membrane of the type specified wi ll not be measured, but shall be the square yard final pay quantity in accordance

with 109.11 for the waterproofed surfaces within the limits shown on the plans. 4.1.1 Repairs to the substrate or membrane system due to testing are subsidiary to the item and will not be measured. Basis of Payment

5.1Barrier membrane of the type specified is a final pay quantity item and will be paid for at the Cont ract unit price per square

yard complete in place in accordance with 109.11.

5.2Protection board where required will be subsidiary.

5.3Hot-applied rubberized asphalt for sealing the curb line shall be subsidiary.

Pay items and units:

538.1Barrier Membrane, Peel and Stick (F) Square Yard

538.2Barrier Membrane, Peel and Stick - Vertical Surfaces (F) Square Yard

538.5Barrier Membrane, Heat Welded (F) Square Yard

538.6Barrier Membrane, Heat Welded - Machine Method (F) Square Yard

New Hampshire Department of Transportation Standard Specifications – 2016

Description

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

ordered.

Polyvinyl 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

PVC 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

The 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

Waterstops 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

Waterstops 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