506.01 DESCRIPTION. The Asphalt Curing Membrane is used to cure
treated or stabilized base/subgrade layers. Apply and maintain an asphalt curing membrane to the surface of cement or lime treated or stabilized materials in compliance with these specifications or as directed.
506.02 MATERIALS. Asphalt for curing membrane shall be an
emulsified asphalt or an emulsified petroleum resin (EPR-1) complying with Section 1002. Water shall comply with 1018.01.
506.03 WEATHER LIMITATIONS. Do not apply asphalt curing
membrane when the temperature is below 35°F, unless otherwise permitted by the engineer.
506.04 EQUIPMENT. Provide and maintain the necessary equipment
for proper construction of this work. Apply with equipment conforming to
503.13.1 A hand-held pressure nozzle may be used for application in lieu
of the spray bar/tachometer combination for irregular sections or short sections of 1500 feet or less. A gravity flow distribution system will be allowed.
506.05 SURFACE PREPARATION. Assure that the surface to which
curing membrane is to be applied is free from ruts, corrugations, loose material or other irregularities.
506.06 APPLICATION. Apply the asphalt curing membrane
immediately upon completion of final finishing of the final lift of the surface. Uniformly apply the emulsified asphalt curing membrane in accordance with Table 506-1. Remove extraneous material which has collected on the base before additional application of asphalt curing membrane. Maintain and repair the surface before additional applications. Table 506-1 Curing Membrane Type Application Rate1 Gal/Sq Yd Application Temperature2 F Min. Min. EPR-13 0.20 70 Emulsified Asphalt4 0.10 70 1Rates are minimum rates of undiluted asphalt emulsion. Dilution of the asphalt curing membrane is not permitted. 2Minimum application temperature or as recommended by the manufacturer. 3Undiluted EPR shall consist of 5 parts water and 1 part resin concentrate and comply with Section 1002. 4Shall comply with Section 1002.
506.07 PROTECTION. After the curing membrane has been applied,
keep public and construction traffic off the surface until the curing membrane has properly cured, unless otherwise directed by the engineer. Maintain the curing membrane at no direct pay until the mixture has been placed. When traffic is permitted, apply additional curing membrane at intervals to protect and cure the surface at no direct pay.
506.08 MEASUREMENT AND PAYMENT. Asphalt curing membrane
will not be measured for payment; however, payment under the contract will be subject to the payment adjustment provisions of Section 1002 for specification deviations of the asphalt materials. The Materials and Testing Section will provide the payment adjustment percentage for asphalt materials. Water will not be measured for payment.
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