5-101 507.0831 Steel Bridge Railing, 4 Bar L u m p S u m 507.0841 Steel Pipe Hand Railing L u m p S u m 507.0846 Barrier Mounted Steel Bridge Rail: 1 Bar Lump Sum 507.0848 Barrier Mounted Steel Bridge Rail: 2 Bar Lump Sum 507.0951 Aluminum Bridge Railing, Pedestrians L u m p S u m 507.0961 Aluminum Bridge Railing, Pedestrian, with Pales Lump Sum SECTION 508 -WATERPROOFING MEMBRANE
508.01 Description This work shall consist of furnishing and a pplying an approved
waterproofing membrane to concrete deck surfaces, or other conc rete surfaces, with a barrier type membrane in accordance with this specification, other appl icable Contract documents and the manufacturer’s published recommendations, complete, in place and accepted. Waterproofing membrane shall be either peel and stick sheet wat erproofing membrane (sheet membrane) or torch or spray applied high performance wat erproofing membrane (high performance membrane).
508.02 Materials Sheet membrane and high performance membrane shall include all
materials, as recommended by the manufacturer, to produce a wat erproof barrier on the specified concrete surface. In addition to the membrane, these materials may include primer, hot-applied rubberized asphalt sealer, mastic, flashing , aggregate scatter and tack coat. The list of acceptable sheet membrane products is includ ed on the Department’s Qualified Products List (QPL), of Waterproofing Membranes: Stan dard Systems. The list of acceptable high performance membrane products is included on th e Department’s QPL of Waterproofing Membranes: High-Performance (Spray Applied) or High Performance- (Torch Applied).
508.04 Construction- General The Contractor shall store and in stall the membrane and
all associated components in accordance with the manufacturer’s published recommendations. Existing membrane waterproofing remaining on structures to be r ehabilitated shall be completely removed to the primed surfaces. At the discretion o f the Resident, tightly adhered membrane residue that cannot reasonably be removed by s craping using industry standard practices, may be left in place. Prior to application of primer or installation of membrane: Co ncrete shall be cured in accordance with applicable Contract requirements; areas where r apid setting patching materials have been placed shall be cured for a minimum of 72 h ours, or as recommended by the product manufacturer. The entire surface of concrete structures specified to receive waterproofing membrane shall be shot blasted to achieve a surface which is clean and f ree of laitance, oil, grease and any foreign materials, as well as any sharp protrusions or shar p indentations. For superstructure decks, including, but not limited to, precast bo x beams, voided slabs, and 5-102 NEXT beams, shot blasting shall be accomplished using self-cont ained, self-propelled equipment to achieve a consistent anchor profile; areas that ar e not accessible to self- propelled shot blasting equipment, as determined by the Residen t, shall be blasted with appropriate equipment utilizing either mineral grit or steel gr it and air pressure sufficient to achieve an acceptable surface profile. Surfaces of structures other than superstructure decks, such as box culverts or arches, that are to receive wate rproofing membrane may be high-pressure (minimum of 8,000 psi) water blasted or sandblast ed, in lieu of being shot blasted, as approved by the Resident. The Contractor shall hav e a copy of Technical Guideline No. 03732, published by the International Concrete Re pair Institute. The final concrete surface profile shall range between a CSP 1 and a CSP 5, as defined by this Guideline, or as approved by the membrane manufacturer’s repres entative. All surfaces shall then be cleaned to remove all loose dust and debris. Priming and membraning shall only be done when the air and conc rete temperatures are above 40 degrees Fahrenheit and the surfaces that are to receiv e the primer and membrane have a moisture content at, or below, 6 percent. Primer or mem brane shall not be applied or installed until the concrete has been in place for a minimum of 10 days. The Contractor shall supply a portable electronic moisture meter capable of me asuring the moisture content of concrete surfaces in percent. The list of acceptable moistu re meters is included on the Department’s QPL under Waterproofing Membranes. The moisture meter shall be calibrated annually and a certificate of calibration from the m oisture meter manufacturer shall accompany the meter. The Contractor shall perform moist ure testing of the concrete substrate using the Contractor- provided moisture meter. Moist ure tests shall be performed at locations determined by, and in the presence of, the Residen t. Written test results shall be submitted to the Resident prior to beginning the priming and me mbraning operations. Membrane shall be installed in a shingled pattern so that water is permitted to drain to the low areas of the structure without accumulating against sea ms, and pressed or rolled into place to assure bond with the primed surface and to eliminate a ir bubbles. Lap joints at the beginning and end of rolls shall be staggered with those of adj acent rolls. All overlapping joints shall be sealed in accordance with the manufacturer’s re commendations. Care shall be taken to ensure that the waterproofing membrane i s properly sealed around the one inch diameter superstructure deck drains and that the d rains are completely opened prior to paving over them. Any drainage slots in the bridge dra ins shall be opened both before and after placing the bituminous pavement. Waterproofing membrane over which hot mix asphalt (HMA) pavemen t will be placed shall receive a bituminous tack coat, in accordance with Standa rd Specification Section 409, with a coverage rate of between 0.01 and 0.02 gallons per squar e yard. Alternately, if a membrane manufacturer recommends its own tack coat as part of i ts waterproofing system, then this tack material shall be applied in accordance with the manufacturer’s recommendations. Prior to tacking, the membrane shall be clean and free from loose debris, moisture or other contaminants. Membrane surfaces that have be en tacked shall be paved within 48 hours of application of the tack coat. 5-103 The required laydown temperature of HMA pavement placed on high performance membrane shall be within the tolerances included in the membran e manufacturer’s written recommendations, with the target temperature to be at the high end of the given range, but not to exceed 330 degrees Fahrenheit, measured at the HMA pavem ent plant. Paving operations shall be done in a manner to permit water to drain t o the low area of the deck without entrapment. No vehicles , other than the HMA paving equ ipment, will be permitted on the membrane prior to placing t he HMA pavement. The first la yer of HMA pavement placed on a superstructure deck shall be placed with an approve d rubber mounted bituminous paver of such type and operated in such a manner tha t the waterproofing membrane will not be damaged in any way. Paving equipment whee ls and tires shall be clean and free from stones or other material that could penetra te the membrane. The tack coat and HMA pavement may be applied immediately after the memb rane is installed. For high performance membrane, the primer and membrane shall be app lied by a manufacturer certified applicator. Applicators shall be individuals who hav e been thoroughly trained by the manufacturer, in all aspects of application of the membrane system. Although an individual may be certified as both an applicator and a represe ntative, the individual shall not serve in both capacities at the same time. Upon certificat ion, 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 th e word “Applicator”. The text of the badge shall be clearly printed in English. The applicat or shall have the badge on and prominently displayed at all times, while installing the membra ne system. The Contractor shall arrange for a manufacturer’s representati ve to be present at all times during the installation of high performance membrane, inc luding application of the primer and tack coat. The representative shall also be present for placement of the HMA binder course over the membrane. The representative shall be r eadily identified by a photo identification badge, issued by the manufacturer, that includes the manufacturer’s name and logo, a current photograph of the representative, the represent ative’s full name and the word “Representative”. The text of the badge shall be clearly print ed in English. The representative shall have the badge on and prominently displaye d at all times, while overseeing this work. Overlap of side seams and end laps and application procedures n ot addressed by this specification shall be done in accordance with the membrane man ufacturer's published recommendations. Torn or damaged membrane shall be repaired in accordance with manufacturer’s recommendations. Blistering of membrane at any time prior to Final Acceptance shall be repaired in accordance with the manufacture r’s recommendations. At least one week prior to installation of any waterproofing membr ane, the Contractor shall submit the manufacturer’s written requirements pertaining to ov erlapping of seams, application procedures, repairing of damaged membrane and treat ment of blistering of the membrane, including treatment of blistering either before, duri ng or after the first lift of HMA pavement is placed on the membrane, to the Resident.
508.05 Installation- Sheet Membrane All construction joints an d all joints between
precast concrete elements (e.g., box culverts, three-sided boxe s, arches, box beams, voided 5-104 slabs) shall be double covered with membrane by first applying a sheet with a minimum width of 12 inches, centered along the joint. The perimeter of all membrane placed in a given day's operation shall receive a seal of mastic over the edge of the membrane. Areas around drains or pr otrusions shall be liberally coated with mastic at the edges. When the membrane is completed , the perimeter shall receive an additional seal of mastic along the edge of the memb rane.
508.06 Installation- Torch Applied High Performance Membrane T he waterproofing
membrane shall be heat welded onto the prepared substrate. Car e 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. Machines used to apply membrane shall be fully functional, including thermostats. When the surface area of a superstructure deck is greater than 8,000 square feet, the membrane shall be machine applied. The machine shall be capabl e of handling rolls of at least 100 square yards, shall be self-propelled and shall be ca pable of automatically following the edge of previously placed membrane. Corner detail at edge of superstructure slab/vertical surfaces (e.g., curb or permanent barrier): Membrane material or special flashing shall be insta lled in corners, in accordance with the manufacturer’s recommendations, to within ½ inch of th e top of the HMA wearing surface. In the absence of a manufacturer’s recommended flashi ng or if the manufacturer does not recommend bending membrane material to conform to this corner configuration, then the following procedure shall be used: The membrane shall be heat welded to the slab to within one inch of the vertical surface; the vertical surfac e shall be protected to prevent damage or permanent discoloring of the vertical surface; the re maining area between the edge of the membrane and the vertical surface shall be complete ly sealed with hot-applied rubberized asphalt material, meeting the requirements of the me mbrane manufacturer’s recommendations; the hot-applied rubberized asphalt material sh all be applied so as to form a complete seal between the membrane and the vertical surface a nd shall extend up the vertical surface to within ½ i nch of the top of the HMA wearin g surface. Corner detail at end of superstructure slab/vertical surface (e .g., backwall): The waterproofing system shall be placed on vertical surfaces, at t he ends of slabs, down the vertical face, a minimum of one foot, unless otherwise shown on the Plans. All joints between buried precast concrete elements (e.g., box culverts, three-sided boxes, arches) shall be double covered with membrane by first a pplying a strip with a minimum width of 12 inches, centered along the joint. For superstructure decks: Immediately prior to application of the tack coat, the entire surface of the membrane shall be rolled with a rubber tired rol ler and any blisters found in the membrane shall be repaired with guidance from the manufactu rer’s representative, as per the manufacturer’s recommendations; similarly, if blisters appe ar during or after placement 5-105 of the first lift of HMA pavement , the membrane shall be repair ed with guidance from the manufacturer’s representative, as per the manufacturer’s recomm endations.
508.07 Installation- Spray Applied High Performance Membrane S pray applied
membrane shall be installed in accordance with the manufacturer ’s recommendations. Corner detail at edge of superstructure slab/vertical surfaces (e.g., curb or permanent barrier): The waterproofing system shall be placed to within ½ inch of the top of the HMA wearing surface. Corner detail at end of superstructure slab/vertical surface (e .g., backwall): The waterproofing system shall be placed on vertical surfaces, at t he ends of slabs, down the vertical face, a minimum of one foot, unless otherwise shown on the Plans. Aggregate scatter shall be applied to the final coat of membran e, in accordance with the manufacturer’s recommendations. Materials for aggregate scatte r shall be in accordance with the manufacturer’s requirements.
508.08 Method of Measurement Waterproofing Membrane will be me asured for
payment as one lump sum.
508.09 Basis of Payment Waterproofing Membrane will be paid fo r at the Contract
lump sum price, which shall be payment in full for furnishing a ll materials, labor and equipment, including cleaning of concrete surfaces and providin g a moisture meter, and all incidentals necessary to provide a waterproof barrier on the sp ecified concrete surface that is properly adhered to the concrete substrate. Tack coat provided as part of the waterproofing membrane manufacturer’s system shall be included in the lump su m price for waterproofing membrane; bituminous tack coat provided in accordance with Stan dard Specification Section 409, Bituminous Tack Coat, shall be paid for under Item 409.15, Bituminous Tack Coat, Applied. Payment for repair of surfaces to which membran e is to be applied shall be paid for separately, when applicable repair items are included in the Contract. Damage to new concrete surfaces, resulting from the Contractor’s placemen t or curing operations, or any damage caused by the Contractor’s operations shall be repai red at no cost to the Department. Payment will be made under: P a y I t e m P a y U n i t
508.13 Sheet Waterproofing Membrane Lump Sum 508.14 High Performance Waterproofing Membrane Lump Sum
SECTION 509 -STRUCTURAL PLATE PIPES, PIPE ARCHES, ARCHES, AND M ETAL BOX CULVERTS