515Waterproofing Membrane

Waterproofing Membrane

Description

515.01This 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

515.02The waterproofing membrane shall consist of one of the following:

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

515.03Concrete 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

515.04Waterproofing Membrane

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. Immediately 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.

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.

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 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 with primer. At drainpipes, membrane shall be placed in such a manner that it extends down inside the drain and is secured with primer.

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.

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. Following 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 from entering at this point.

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.

or as approved.

515.05Concrete Sealer

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 visual 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

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.

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, sidewalks, 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

515.06Waterproofing 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

515.07The 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 the 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

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516.01