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403.03.2 Application of Bituminous Material.
a.Application Rates. The asphalt emulsion shall be uniformly applied at the following rates over the entire existing surface to be overlaid:
1.Old Pavement. The application rate shall be 0.08 gallons per square yard, plus-or-minus 0.02 gallons per square yard.
2.New Pavement .
a.For new pavements at least thirty days old or have been opened to traffic: The application rate shall be 0.06 gallons per square yard, plus-or-minus 0.02 gallons per square yard.
b.For new pavements less than thirty days old and which have not been opened to traffic: A tack coat is not required.
b.Nozzle Settings . Tack coat shall be applied using the proper nozzle settings and the “double coverage” or “triple coverage” techniques as outlined in Chapter 5 of Asphalt Institute Publication MS-22, “Construction of Hot Mix Asphalt Pavements.”
c.Additional Requirements. The newly placed tack coat shall be allowed to break and set prior to paving. This process is defined as the separation of the asphalt from the water from within the emulsion which is signified by a change in color of the material from brown to black, the evaporation or removal of the resultant surface water and the adherence of the tack material to the underlying pavement. NOTE: The Contractor will be required to wait for this process to complete for up to one hour. At the end of this specified period, if the tack coat has not fully tr ansformed as defined herein (break and set), the Contractor may by his choice proceed to pave over the tacked area. Nevertheless, in any case the Contractor shall ensure that should any material be picked up by his equipment, that it be removed by whatever means, prior to its falling onto or affecting the newly placed pavement layer in any way. Special care shall be taken to eliminate or minimize equipment passage over tacked surfaces so as not to hinder or negate the tack’s effectiveness in the pavement bonding process . Furthermore, attention shall be given to gore areas to ensure that asphalt emulsion is not sprayed or tracked onto precast gore markers. This shall be accomplished by placing a covering, to be anchored in place, to prevent any movement, over the gore markers. Additionally, the Contractor shall not proceed to pave over any tacked surface until approval from the Engineer is given. Sections not approved by the Engineer shall be corrected and subsequently receive the Engineer’s approval prior to paving. Should there be multiple rejections of tack coat, the Engineer reserves the right to suspend paving and require the Contractor to submit a detailed action plan outlining those steps to be taken to ensure proper application of tack coat prior to the commencement of further paving operations.
403.04 METHOD OF MEASUREMENT. "Asphalt Emulsion Tack Coat" will be measured by the
number of square yards actually spread in the designated area(s) and at the specified rate, all in accordance with the Plans and/or as directed by the Engineer.
403.05 BASIS OF PAYMENT. The accepted quantity of "Asphalt Emulsion Tack Coat" will be paid
for at the contract unit price per square yard as listed in the Proposal. The price so-stated constitutes full and complete compensation for all labor, materials, and equipment, and all 4−28 incidentals required to finish the work, complete and accepted by the Engineer.
403.06 FAILURE TO COMPLY. Should the Contractor fail to comply with any portion of this
provision, a penalty will be imposed for each tacked subsection not in compliance with these requirements. The penalty for a subsection will be five percent (5%) of the combined contract cost for asphalt and asphalt emulsion tack coat for the par ticular subsection in nonc ompliance. The total penalty for a day/night’s paving will be the combi ned fines from all noncompliant subsections or $2500.00, whichever is greater. A tacked subsection will be defined as that area covered with tack coat, the width of a single paving machine’s actual asphalt placement, extending to the end of that particular pass of tack coat but not to exceed 0.2 (two-tenths) miles in length. This means that if the Contractor tacks in excess of 0.2 mile on a pass t hen there would exist multiple tacked subsections each subject to the terms and conditions of this provision. SECTION 404 PRIME COAT
404.01 DESCRIPTION. This work consists of treating an existing gravel surface with bituminous
material, and blotter material, if required, in preparation for receiving a subsequent bituminous course, at the locations indicated on the Plans or as directed by the Engineer, all in accordance with these Specifications. 404.02 MATERIALS. 404.02.1 Bituminous Materials. Bituminous material used as prime coat may be any of those enumerated in Subsection M.03.03 of these Specifications. They are:
a.Asphalt Cement; Subsection M.03.03.1
b.Medium Cure Cut-Back Asphalt; Subsection M.03.03.2
c.Rapid Curing Cut-Back Asphalt; Subsection M.03.03.3
d.Emulsified Asphalt; Subsection M.03.03.4 The grade may be changed as required by the Engineer during construction at no change in unit price. 404.02.2 Blotter Material. Blotter material shall meet the requirements of Subsection M.01.08; Fine Aggregate , of these Specifications. The material ma y be accepted in stockpile at the source.
404.03 Construction Methods.
404.03.1 Equipment. The equipment to be used shall include a power broom, approved broom
dragging equipment, rollers, a self -propelled mechanical spreader for spreading coarse aggregate,
Source: Rhode Island Standard Specifications (Bluebook), 2024 Edition. Pages 205–206 of 826.