515.01 515-1 SECTION 515 WATERPROOFING MEMBRANE DESCRIPTION
515.01 This work consists of furnishing and placing an approved waterproofing membrane and
protective covering over a prepared concrete bridge deck surface or furnishing and placing an approved chemical concrete sealer (sealer) on the surface of a concrete bridge deck, approach slabs, and all adjacent sidewalk and curb, and other applications designated on the plans. MATERIALS
515.02 The waterproofing membrane shall consist of one of the following:
1.A prefabricated reinforced membrane and primer or,
2.A single component, hot -applied elastomeric membrane and primer if required. Materials for the waterproofing membrane shall meet the requirements specified in the following subsections: Protective Covering 705.07 Prefabricated, Reinforced Membrane and Primer 705.08 Single Component, Hot Applied, Elastomeric Membrane 705.09
515.03 Concrete sealer shall consist of an alkyl -alkoxy silane and shall be a penetrating type
with 40 percent solids in water or a high flash organic solvent. The sealer shall be compatible with the curing compound used on the concrete and shall be one that is included on the approved products list of the Department. A certificate of compliance shall be provided with each shipment of sealer. CONSTRUCTION REQUIREMENTS
515.04 Waterproofing Membrane.
a.Condition of Concrete Deck for Application of Waterproofing Membrane. The entire deck and the sides of the curbs for a height of 2 inches above the plan thickness of the hot mix asphalt shall be free of all foreign material such as dirt, grease, old pavement and primer. All decks shall be sand blasted or shot blasted. Immed iately before the application of primer or any type of membrane, all dust and loose material shall be removed. The deck condition will be approved before application of the membrane.
b.Weather and Moisture Limitations for Application of Waterproofing Membrane. Application of primer or membrane shall not be done during inclement weather conditions, or when deck and ambient air temperatures are below 50 °F . The deck surface shall be dry at the time of application of primer and membrane.
c.Application , Prefabricated, Reinforced Membrane. Primer shall be applied to the prepared concrete surface at the rate and according to the procedure recommended by the membrane manufacturer. Placement of the membrane shall not begin until the volatile material in the primer has dissipated. The membrane shall be placed in such a manner that a shingling effect will be achieved, and any accumulation of water will be directed toward curbs and drains. Primer and membrane shall be placed on the curb faces for a height of 2 515.05 515-2 inches above the plan thickness of the hot mix asphalt. The entire membrane shall be essentially free of wrinkles, air bubbles and other placement defects. Blisters or bubbles larger than 2 inches in diameter, which develop after placement of the membrane and before placement of protective covering, shall be punctured, the air expelled, and membrane patched in a manner satisfactory to the Engineer. At all expansion joints, and other joints, membrane shall be flashed up to the top of the joint and secured wi th primer. At drainpipes , membrane shall be placed in such a manner that it extends down inside the drain and is secured with primer.
d.Application, Single Component, Hot Applied, Elastomeric Membrane. Hot applied membrane shall be applied to the prepared deck surface at a uniform minimum rate of 1/2 gallon per square yard thickness of 90 to 110 mils, 1 mil = 0.001 inch. During application the thickness may be measured by the Engineer. Lack of uniform application shall be cause for termination of the work until remedial measures are taken. Primer , if required, and membrane shall be placed up the curb faces for a height of 2 inches above the plan thickness of hot mix asphalt.
e.Application of Protective Covering. As soon as practical, but in all cases the same day as membrane application, protective covering shall be placed from gutter line to gutter line. Protective covering shall be laid parallel to the centerline of the bridge. The protective covering shall be butted together at longitudinal and transverse joints. Overlapping will not be permitted. The maximum allowable space between adjoining sections of protective covering shall be 1 inch. Fo llowing placement of protective covering, a bead of compatible mastic or hot applied membrane shall be applied where the protective covering contacts the curbs, and in cracks between adjoining sections that are apart by more than 3/8 inch. The bead shall fill the void preventing water fr om entering at this point.
f.Inspection. Upon completion of the membrane and protective covering the Engineer will inspect the membrane system. Approval in writing from the Engineer shall be obtained before application of hot mix asphalt. The Contractor shall be responsible for maintaining the condition of the membrane system on the bridge deck until covered with hot mix asphalt to the thickness required by the Contract.
g.Overlay. Hot mix asphalt shall be placed, spread and compacted, per the specifications or as approved.
515.05 Concrete Sealer.
a.Condition of Surface for Application of Sealer. The surface of bridge deck, approach slabs, sidewalks, and curbs and the interior concrete surface of drains shall be free of all residue and other surface contaminants. Within 48 hours before the application of the sealer these surfaces shall be cleaned with dustless abrasive shot blasting. Other methods of blasting, power washing, or cleaning may be used if approved. The amount of shot blasting or cleaning shall be sufficient to remove all vi sual evidence of curing compound residue, dirt, grease, and surface contaminants. When wet methods are used the surface shall be dried per subsection 515.04. 515.06 515-3 (b) Weather and Moisture Limitations for Application of Sealer. Sealer shall not be applied when the deck or ambient air temperature is below 40 °F , above 90 °F , or outside the manufacturer's recommended temperature range. The concrete shall have aged a minimum of 28 days and the surface shall be dry at the time of application of the sealer. When the surface is wet because of inclement weather , power washing, or other moisture, it shall be permitted to dry at least 24 hours before the sealer is applied.
c.Application of Sealer. Sealer shall be applied uniformly at the manufacturer’s recommended rate. The sealer shall be applied to the surface of the concrete bridge deck, approach slabs, curbs including the face of concrete bridge rail for 6 inches above the bridge deck, sidewal ks, and the interior concrete surface of drains. Two copies of the manufacturer's literature for the sealer including the recommended application procedure shall be provided to the Engineer before application. The literature shall include a product material safety data sheet. All solvents, coatings, or other chemical products, or solutions, shall be mixed, handled, applied, stored and disposed of in such a manner that spills, splashes, and drips shall be contained without contamination of the soil, vegetation, streams, or other water bodies. The Contractor shall provide two approved respirators for use by Department personnel. Traffic shall not be allowed on the treated surface until the sealer has penetrated the concrete and the liquid sealer is no longer visible on the surface. The Contractor shall follow all the manufacturer's recommendations, including penetration time, before opening to traffic. METHOD OF MEASUREMENT
515.06 Waterproofing membrane including protective covering, complete in place, will be
measured by the number of square yards of bridge deck covered. Material placed on curb faces will not be measured. Concrete sealer will be measured by the number of square yards of concrete surface covered, except material placed on drains will not be measured. BASIS OF PAYMENT
515.07 The accepted quantities of waterproofing membrane including protective covering will
be paid for at the contract unit price per square yard. The accepted quantities of concrete sealer, including surface preparation, will be paid for at the contract unit price per square yard of concrete surface covered. Preparation and sealing of drains will not be paid for separately but shall be included in t he work. Payment will be made under: Pay Item Pay Unit Waterproofing (Membrane) Square Yard Concrete Sealer Square Yard Hot mix asphalt will be measured and paid for per Section 403. 515.07 515-4 THIS PAGE INTENTIONALLY LEFT BLANK 516.01 516-1 SECTION 516 DAMPPROOFING DESCRIPTION
516.01 This work consists of dampproofing concrete surfaces per these specifications and in
conformity with the plans or as ordered. MATERIALS
516.02 Materials for dampproofing with asphalt shall conform to the requirements of
subsection 702.01. CONSTRUCTION REQUIREMENTS
516.03 Surfaces to be dampproofed shall be cured, dry and free of all frost, loose material and
dirt. The surface that is to be protected by dampproofing shall be thoroughly cleaned before the primer is applied. The surface shall then be brush or spray painted with two coats of asphalt for primer treatment at a rate of 1/8 gallon per square yard for each coat. After the primed surface has dried one application of asphalt dampproofing material shall be applied by brush, at a rate of 1/10 gallon per square yard. Care shall be taken to prevent discoloration of other parts of the structure not to be dampproofed, by the dripping or spreading of asphalt. METHOD OF MEASUREMENT
516.04 Dampproofing will be measured by the square yard of surface area dampproofed.
BASIS OF PAYMENT
516.05 The accepted quantities of dampproofing, including absorptive primer coats, will be
paid for at the contract unit price per square yard. Payment will be made under: Pay Item Pay Unit Dampproofing (Asphalt) Square Yard
Source: Colorado Standard Specifications for Road and Bridge Construction, 2023 Edition. Pages 525–528 of 943.