651.1 General Description
This work includes furnishing and placing raised traffic bars according to the type, locations, and specifications in the plans.
651.1.01 Definitions
General Provisions 101 through 150.
651.1.02 Related References
A. Standard Specifications Section 500—Concrete Structures Section 886—Adhesive (Epoxy Resin) B. Refer enced Documents General Provisions 101 through 150.
651.1.03 Submittals
General Provisions 101 through 150.
651.2 Materials
Ensure that materials meet the requirements of the following specifications: Material Section Adhesive (Epoxy Resin) Section 886 Concrete, Class A, Air Entrained Section 500
651.2.01 Delivery, Storage, and Handling
General Provisions 101 through 150.
651.3 Construction Requirements
651.3.01 Personnel
General Provisions 101 through 150.
651.3.02 Equipment
General Provisions 101 through 150.
651.3.03 Preparation
General Provisions 101 through 150.
651.3.04 Fabrication
General Provisions 101 through 150.
651.3.05 Construction
A. Precasting 1. Concrete Use concrete materials, and mix and place concrete, to comply with Section 500 for Class A, Air Entrained. 2. Forms Use forms that meet the requirements of Section 500. Make the insides of forms accessible for tamping and vibrating the concrete. 3. Finish Unless otherwise specified on the Plans, finish bars according to Subsection 500.3.05.AB. For unformed areas, use Type IV—Floated Surface Finish, unbroomed. For formed areas, use Type I—Ordinary Surface Finish. 4. Curing Cure bars according to Subsection 500.3.05.Z, except do not use curing compound on the bottom surfaces. B. Installation Follow these steps to cement bars to the pavement: 1. Sandblast clean the highway surface of dirt, curing compound, grease, oil, moisture, loose or unsound layers, and other material that would prevent the bar adhesive from bonding. 2. Use epoxy resin type IR or IS adhesive as follows: a. Use type IR when pavement temperature is between 50 ° to 60 °F (10 ° to 15 °C), or when traffic conditions require a rapid set. b. Use type IS when pavement temperatures are above 60 °F (15 °C) and when traffic conditions permit. c. Do not place bars when pavement temperatures drop below 50 °F (10 °C). 3. Place enough adhesive on the cleaned pavement, or on the bottom of the bar, to completely cover the area of contact with no voids. Allow a slight amount of adhesive to extrude from all sides of the bar after it has been pressed into place. 4. Position the bar and press it firmly into the pavement. Immediately and completely remove excess adhesive around the edge of the bar with a clean, absorbent cloth. Do not use thinners or solvents to remove the adhesive. Protect the bar from impact until the adhesive hardens to the degree designated by the Engineer. C. Adhesive Qualities Do not use a viscous or partially set batch of adhesive that does not extrude from under the bar edges when pressed to the pavement. Do not heat any adhesive above 120 °F (49 ºC). Prepare adhesive as follows: 1. Before combining Package A and B, thoroughly stir each package. Reject material that cannot be readily redispersed. 2. After stirring, mix one volume from Package A with one volume from Package B until obtaining a uniform color with no visible streaks of either component. 3. Cement bars in place within 10 minutes of starting to mix the adhesive. 4. To prolong the pot life of the adhesive, either let it cool after mixing the components or spread out a thin layer on a board before applying it. 5. When an approved fast setting adhesive is used, mix the components using a 2-component type automatic mixing and extrusion apparatus. Place the bars immediately after the adhesive has been mixed and extruded.
651.3.06 Quality Acceptance
General Provisions 101 through 150.
651.3.07 Contractor Warranty and Maintenance
General Provisions 101 through 150.
651.4 Measurement
Complete and in-place raised traffic bars, of the type specified, are measured by the linear foot (meter) along the bottom front face of the bar.
651.4.01 Limits
General Provisions 101 through 150.
651.5 Payment
Raised traffic bars will be paid for at the Contract Unit Price per linear foot (meter). Payment is full compensation for furnishing and installing the bar. Payment will be made under: Item No. 651. Raised traffic bars, type_____ Per linear foot (meter)
651.5.01 Adjustments
General Provisions 101 through 150.
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