707TUBULAR MARKER ( FLEXIBLE)

763 Excess adhesive on the pavement and on the exposed surfaces of the markers shall be immediately removed. Thinners or solvents which may be detrimental to either the markers or the bond provided by the adhesive shall not be used in removing excess adhesive. Markers shall not be installed when the temperature of the pavement surface or the atmosphere is less than 40 degrees F, when the relative humidity is 80 percent or higher or when the pavement surface is not dry. All markers shall be installed to the line approved by the Engineer and in such manner that the reflective face of the markers is perpendicular to a line parallel to the roadway centerline. No pavement markers shall be installed over longitudinal or transverse joints of the pavement surface. 706- 4 Method of Measurement: Pavement markers will be measured as a unit for each marker furnished and placed. 706- 5 Basis of Payment: The accepted quantities of pavement markers, measured as provided above, will be paid for at the contract unit price for the type designated in the bidding schedule, complete in place, including adhesive and surface preparation. 707- 1 Description: The work under this section shall consist of furnishing and installing flexible tubular markers in accordance with the details shown on the project plans and the requirements of these specifications. The work shall also include the removal and salvage of the markers when ordered by the Engineer. 707- 2 Materials: The post shall be of a flexible material which is resistant to impact, ultra violet light, ozone, hydrocarbons and stiffening with age. The base shall prevent post removal by impact or vandals. The post and base shall exhibit good workmanship and shall be free of burns, discoloration, contamination, and other objectionable marks or defects which affect appearance or serviceability. The post shall be designed to resist overturning, twisting and displacement from wind and impact forces. A 50- mile per hour wind load TABLE OF CONTENTS INDEX 764 shall not deflect the post more than 2 inches from the at -rest position. Measurement shall be made at the point of maximum deflection and normal to the movement. The post shall have minimum tensile strength of 1,100 pounds per square. The tensile stress shall be determined in accordance with the "Standard Method of Test for Tensile Properties of Plastic,” ASTM D638 (Test Specimen Type 1). The rate of jaw separation shall be 20 inches per minute. The post shall be conditioned for a minimum of two hours in an oven at 140 ± 3 degrees F. The conditioned post shall be capable of straightening itself within 30 seconds when bent 180 degrees at the midpoint for each of four bends. The stress test on each post shall be completed within two minutes of removal from oven. The post shall be sufficiently rigid to resist wil ting after conditioning a minimum of two hours at 180 ± 3 degrees F. The post shall be conditioned a minimum of two hours at -5 ± 3 degrees F in an environmentally controlled test chamber. Testing shall be performed in the environmental chamber. The post shall be sufficiently flexible to permit four 180- degree bends at the midpoint without cracking, each time straightening itself within 60 seconds. The post shall be manufactured from an impact resistant material so that an installed post is capable of sel f-erecting and withstanding 10 vehicle impacts at 55 miles per hour at temperatures of 40 degrees F or above without breakage or loss of serviceability. Little or no damage shall be caused to the impacting vehicle. The vehicle shall be a typical sedan with a weight of 4,000 ± 1,000 pounds. The post shall also be capable of sustaining a wheel hit during testing at 55 miles per hour without loss of serviceability. The reflective sheeting shall be a high reflectivity flexible sheeting conforming to the requi rements of Section 1007 of the specifications. The sheeting must retain 75 percent of its reflectivity after 10 vehicle impacts at 55 miles per hour. Color shall be silver -white, yellow, or green in accordance with the appropriate Federal Highway Adminis tration color tolerance chart. The base shall prevent post removal by impact or vandals. The base shall not protrude more than 4 inches above the pavement surface. 707- 3 Construction: The base shall be installed with an epoxy adhesive or acceptable alternate, in accordance with the manufacturer's specifications. TABLE OF CONTENTS INDEX