731.01 DESCRIPTION. Furnish and place raised pavement markers in
accordance with the plans. The contractor shall be responsible for field layout and alignment of raised pavement markers. Existing pavement striping shall generally be used as a guide in determining raised marker locations. The Department will replace obliterated striping prior to installation of raised pavement markers; however, if no striping exists or is obliterated at the time of raised marker installation, the contractor shall determine raised pavement marker locations in accordance with plan details or as directed.
731.02 Materials.
731.02.1 Markers: Markers shall comply with 1015.09. Use the
same product throughout the project. Markers shall be the specified class, type, color, size, and shape.
731.02.2 Epoxy Adhesive: Use Type I (Rapid Setting) or Type II
(Standard Setting) epoxy resin adhesive system complying with 1017.03. Mix epoxy components and dispense adhesive in accordance with manufacturer’s recommendations.
731.02.3 Bituminous Adhesive: Bituminous adhesive shall
comply with 1015.09.3.2.
731.03 Construction Requirements.
731.03.1 Weather Limitations: Do not apply markers when there
is moisture on the surface.
731.03.1 1 Epoxy Adhesive: When using a standard set
adhesive, do not apply markers at ambient air temperatures less than 50°F. When using a rapid set adhesive, application of markers will be permitted at ambient air temperatures between 35°F and 50°F, provided the adhesive is adequately heated to obtain proper viscosity for mixing and application, and is also identified as a rapid set type on container labels and Certificates of Delivery.
731.03.1 2 Bituminous Adhesive: Apply markers when the
ambient air temperature reaches 35°F or greater, or in accordance with the manufacturer’s recommendations.
731.03.2 Removal of Markers: Remove markers by methods that
will not damage the pavement surface. Repair damage to pavement surface at no cost to the Department. After removing the markers, the debris and residue shall become the property of the contractor and be disposed of properly.
731.03.3 Cleaning of Surfaces: Surfaces, including ramps and gore
areas, on which markers are to be applied must be cleaned of all materials that may reduce the bond of adhesive. Clean surfaces by blast cleaning or other approved methods which do not damage the surface. Blast cleaning equipment must have positive cutoff controls. Maintain surfaces in a clean dry condition until placement of markers.
731.03.4 Application of Markers: Place markers with bituminous
adhesive on asphalt surfaces. Place markers with Type I or II epoxy resin adhesive, or Type II or III bituminous adhesive on portland cement concrete surfaces. Surfaces on which markers are to be placed shall be blown dry immediately prior to marker placement. Apply markers to surfaces with adhesive in accordance with the manufacturer’s recommendations. Do not place pavement markers on joints.
731.03.4 1 Epoxy Adhesive: Mixed adhesive shall have a
uniformly grey color with no streaks of either black or white on the surface or within mixed adhesive. Voids in a cured undisturbed sample approximately 1/16 inch thick from the extrusion nozzle shall not exceed 4 percent by volume. Machine mixer and applicator shall be capable of accurately and uniformly proportioning the two components in a 1:1 ratio within 5 percent by volume of each component (i.e., within 47.5 to 52.5 percent for each component). Perform periodic checks of proportioning equipment to determine the actual ratio of components. Do this by placing containers in front of the mixing chamber and measuring the actual volume of each component. Arrange equipment so it is possible to bypass the mixer to perform these periodic checks. Maintain temperature of adhesive between 70°F and 110°F before mixing. Apply adhesive in sufficient quantity to cause excess adhesive to be forced out around the perimeter of the marker. Maintain the temperature to prevent excessive flow of epoxy from the marker when installed. Fill voids in markers with an open grid pattern on bottom with adhesive immediately prior to placement.
731.03.4 2 Bituminous Adhesive: Heat and melt the adhesive
in either thermostatically controlled double boiler type units utilizing heat transfer oil or thermostatically controlled electric heating pots. The melter/applicator unit shall be suited for both melting and pumping application through heated applicator hoses. Heat the adhesive as per manufacturer’s recommendations and apply directly to the pavement surface from the melter/applicator by either pumping or pouring. The area of the bituminous adhesive bed shall be a minimum of 6 inches in diameter. Apply markers to the adhesive within 10 seconds. Place the marker in the adhesive bed by applying downward pressure until the marker is firmly seated. Immediately remove adhesive on exposed surfaces of markers with soft rags moistened with mineral spirits or kerosene. Protect markers against impact until the adhesive hardens. Reheat and reuse the adhesive; however, do not exceed the pot life at application temperatures.
731.04 MEASUREMENT. Raised pavement marker installation will be
measured per each marker furnished, placed, and accepted. Raised pavement marker removal will be measured per linear mile.
731.05 PAYMENT. Payment for field layout and alignment of raised
pavement markers will be in accordance with Section 740. Payment for installation of raised pavement markers will be made at the contract unit prices per each. Payment for removal of raised pavement markers will be made at the contract unit price per linear mile. Payment will include all labor, materials, equipment, and incidentals necessary to complete the work. Item No. Pay Item Pay Unit 731-01 Non-reflectorized Raised Pavement Markers Each 731-02 Reflectorized Raised Pavement Markers Each 731-03 Removal of Raised Pavement Markers Linear Mile
Raised Pavement Markers in other states
Get an email when 731 changes
Louisiana revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.