74-Sec 32 17 23.33 - THERMOPLASTIC PAVEMENT MARKINGS.pdf

THERMOPLASTIC TRAFFIC LINES AND MARKINGS

32 17 23.33-1

SECTION 32 17 23.33

HOT THERMOPLASTIC PAVEMENT MARKINGS

PART 1 GENERAL

1.01 DESCRIPTION OF WORK

A. This Work is the furnishing and installation of thermoplastic traffic lines and markings, of the indicated type and color with a surface application of glass beads. Thermoplastic pavement markings shall be used for all stop bars, crosswalks, legends, and arrows.

PART 2 PRODUCTS

2.01 MATERIALS

A. Materials used shall be in accordance with Section 960 of PennDOT Publication 408, dated 2011 and the latest supplements thereof. All materials shall be provided from a source listed in Bulletin 15 and conforming to AASHTO M 249.

B. Glass beads shall conform to Section 1103.14, Type A, of PennDOT Publication 408, dated 2011 and the latest supplements thereof.

PART 3 EXECUTION

3.01 GENERAL

A. Apply in accordance with applicable 67 Pa Code and PennDOT standards.

B. Employ traffic control measures in accordance with MUTCD Chapter 6 and PennDOT Publication 213, Work Zone Traffic Control Manual, at all times.

C. Construction shall be in accordance with PennDOT Publication 111, Traffic Control – Pavement Markings and Signing Standards.

D. Crosswalks shall be installed in accordance with PennDOT Publication 111, Traffic Control – Pavement Markings and Signing Standards and are to be Type C Perpendicular, with a minimum width of 6 feet.

E. Stop Bars shall be installed in accordance with PennDOT Publication 111, Traffic Control – Pavement Markings and Signing Standards and are to be a 24” solid white bar spanning the full width of the travel lane.

3.02 CONSTRUCTION

A. Application for Hot Thermoplastic:

1. Surface Preparation: For proper adhesion, perform surface preparation of the road surface and provide the pretreatment according to Bulletin 15 or recommended by the manufacturer.

Clean the roadway surface where the hot thermoplastic pavement markings will be applied.

Remove all surface treatment, laitance, curing compound, or any contaminants that would hinder adhesion. Clear any loose dirt and other debris from the application area. Surface preparation is incidental to the application of hot thermoplastic pavement markings, except for the removal of any pavement markings as specified by Engineer. Identify the location of the final pavement markings by applying spots on the pavement at 40-foot intervals. The Owner or Engineer will approve the locations. Apply on dry pavement when the air and roadway temperatures are between 50F and 90F and when the wind speed is less than 20 miles per hour.

2. Thermoplastic: Uniformly apply the markings at a minimum thickness of 90 mils ± 3 mils. A tolerance of ± 1/4 inch from the specified width will be allowed provided the variation is gradual and does not detract from the general appearance. For skip line patterns maintain a tolerance of ± 6 inches for each 40-foot cycle and ± 3 inch for each 10-foot skip line.

3. Glass Beads: Apply glass beads immediately after application of the markings at a minimum rate of 10 pounds per 100 square feet of markings. Uniformly distribute glass beads on the surface. Provide markings with an average minimum initial retroreflectivity of 300 mcd/m2/lux

THERMOPLASTIC TRAFFIC LINES AND MARKINGS

32 17 23.33-2 for white and 250 mcd/m2/lux for yellow. Under the direction and supervision of the Representative, measure retroreflectivity with a 30-meter geometry retroreflectometer, conforming to ASTM E-1710 within 21 days after installation in accordance with PTM No.

431.

B. Protection of Surfaces

1. Provide satisfactory protection for pavement markings for at least 30 minutes or until material has dried sufficiently to prevent dirt pick-up and tracking from vehicular traffic.

2. Defective Markings: Repaint marked or damaged areas as directed by Engineer. Remove any markings placed incorrectly and replace them as directed by Engineer. Repair those markings, which after application and drying, are determined to be defective by Engineer.

Complete this work at no additional cost to Owner. Major problem areas and method of repair include the following:

(a) Insufficient thickness or line width, uneven cross-section—Prepare defective material by grinding or blast cleaning to remove a substantial amount of beads and the marking surface is roughened. Remove loose particles and debris with compressed air. Restripe the cleaned surface as specified in Sections 960.3(b) and (c).

(b) Inadequate retroreflectivity, glass bead coverage or retention—Remove defective markings and clean pavement surface, including 1 foot beyond each end of the affected area. Remove loose particles and debris with compressed air. Restripe the marking on the cleaned surface as specified in Sections 960.3(b) and (c).

3. Guarantee: Where directed, remove and replace material that has not remained within close conformity to location or has not remained effective in performing useful service for a period of 180 days from the date of acceptance. The minimum acceptable service is as follows:

(a) Longitudinal Markings. 90% of material remains in each 1,000-foot section of marking where the intersection unit is defined as material on an approach leg within 160 feet of the intersection.

(b) Transverse Markings, Legends, and Symbols. 90% of material remains for each individual legend, symbol, crosswalk, or stop line.

END OF SECTION

PART 1 GENERAL