SECTION 627 - RAISED PAVEMENT MARKERS
627.01 Description. This work consists of furnishing and placing pavement markers of
the types, colors, shapes, and dimensions specified and in reasonably close conformity with the location, lines, and details shown on the plans or as directed by the Engineer.
627.02 Materials. Pavement and jiggle markers of the types specified shall conform to
the applicable requirements of Subsection 720.03 and shall be listed on the Department's APL. Type B through G High Performance reflective markers shall be listed on the Department's APL for high performance raised pavement markers. The bituminous adhesive for pavement markers shall meet the requirements of Subsection
720.03 7.
627.03 Construction Requirements.
627.03.1 General. Unless waived by the State Construction Engineer on the basis of
known performance qualifications, the Contractor or approved Subcontractor shall certify to the Engineer that sufficient experience has been acquired in the placement of the required markers, or the Contractor or approved Subcontractor shall require the manufacturer of the markers to have a qualified technical representative on or immediately available to the project during the application of the markers to assist the Contractor's personnel in the proper application of the adhesive and markers and to render technical assistance to the Engineer as may be deemed desirable. Any such waiver shall be subject to the conditions set forth in the waiver.
627.03.2 Construction Details . The markers shall be installed when the relative
humidity of the air is 80% or less, the pavement surface is dry and the temperature of the pavement surface is no less than 50°F. Ot her pavement marking materials, such as thermoplastic, cold plastic and paint, shall be placed prior to installation of markers. The portion of the highway surf ace to which the marker is to be bonded shall be cleaned so as to be free of dirt, curing compound, grease, oil, moisture, loose or unsound layers, paint and any other material which would adversely affect the bond of the adhesive. The bituminous adhesive shall be melted and heated in either thermostatically controlled double boiler type units utilizing heat transfer oil or thermostatically controlled electric heating pots. Direct flame melting units shall not be used. The melter/applicator unit shall be suited for both melting and pumping application through heated applicator hoses. The adhesive shall be heated to between 375°F and 425°F and applied directly to the pavement surface from the melter/applicator by either pumping or pouring. It is important that application temperature be mainta ined between 375°F and 425°F as lower temperatures may result in decreased adhesion while higher temperatures may damage the adhesive. The adhesive should be applied in a puddle approximately two-thirds to three-fourths the diameter of the marker. Markers should be applied to the adhesive within 10 seconds to assure bonding. The marker shall be placed in position by applying downward pressure until the marker is firmly seat ed with the required adhesive thickness and squeeze out. Excessive adhesive squeeze out shall be removed from the pavement and adhesive on the exposed surfaces of the markers shall be immediately removed. Soft rags moistened with mineral spirits conforming to Federal Specification TT-T-291 or kerosene may be used if necessary, to remove adhesive from exposed faces of pavement markers. No other solvent shall be used. All markers shall be installed in a uniform line, with controls established by the Engineer. The Engineer will establish controls for each line of markers by setting control points at not less than approximately 600-foot intervals on tangents and 50-foot intervals on curves. All additional work necessary to establish intermediate control points and individual marker points shall be performed by the Contractor, including smoothing out minor irregularities in any line established by the Engineer. On curves, the line of markers on lane lines and edge lines shall follow the nor mal curvature of the curve and placement on chords or other variations from the normal curvature will not be permitted, unless specifically shown on the plans or ordered by the Engineer. Reflective markers shall be installed in such a manner that the reflective face of the marker is perpendicular to a line parallel to the roadway centerline. No markers shall be installed over longitudinal or transverse joints of the pavement surface. The marker shall be protected against impact until the adhesive has hardened. The Engineer shall be the judge as to the mini mum time necessary to cure the adhesive for sufficient set to bear traffic. The adhesive may be reheated and reused . However, the pot life at application temperatures shall not be exceeded. Clean-out of equipment and tanks may be performed using petroleum solvents such as diesel fuel or similar materials. CAUTION: Be sure that all heating is off before cleaning operations are begun. All solvent must be removed from the equipment tanks and lines before the next use of the melter.
627.04 Method of Measurement. Raised pavement markers of the type specified will
be measured per each as determined from actual count in place.
627.05 Basis of Payment. Raised pavement markers of the type specified will be paid
for at the respective contract unit price pe r each, which shall be full compensation for completing the work.
Raised Pavement Markers in other states
Get an email when 627 changes
Mississippi revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.