The adhesive may be reheated and reused. However, the pot life at application temperatures shall not exceed the manufacturer’s recommendations. Clean out of equipment and tanks may be performed using petroleum solvents such as diesel fuel or similar materials. All solvents shall be removed from the equipment tanks and lines before the next use of the melter. 1081 -4 EPOXY RESIN ADHESIVE FOR BONDING TRAFFIC MARKERS
This section covers epoxy resin adhesive for bonding traffic markers to pavement surfaces.
The types of epoxies and their uses are as shown below: Type I Rapid Setting, High Viscosity, Epoxy Adhesive. This type of adhesive provides rapid adherence to traffic markers to the surface of pavement. Type II Standard Setting, High Viscosity, Epoxy Adhesive. This type of adhesive is recommended for adherence of traffic markers to pavement surfaces when rapid set is not required. Type III Rapid Setting, Low Viscosity, Water Resistant, Epoxy Adhesive. This type of rapid setting adhesive, due to tis low viscosity, is appropriate only for use with embedded traffic markers. Type IV Standard Set Epoxy for Blade Deflecting- Type Plowable Markers.
Epoxies shall conform to the requirements set for in AAS HTO M237.
Refer to Subarticle 1081 -1(E)
Refer to Subarticle 1081 -1(F) STRUCTURAL TIMBER AND LUMBER -1 GENERAL Use Southern Pine timber and lumber graded in accordance with the current grading rules of the Southern Pine Inspection Bureau unless otherwise specified or approved by the Engineer. Use stress rated grades equal to or higher than the grades specified in this section or as otherwise specified in the contract . For temporary crossings, the use of stress rated lumber having stress ratings below those specified may be used if approved by the Engineer. Have all wood products , including any preservative treatment, inspected and/or tested b y an NCDOT approved commercial inspection company before it is delivered to the project. Provide industry standard commercial inspection reports and treatment test reports for each shipment of treated wood products before its use on the project. Perform inspections of preservative treated materials in accordance with American Wood Protection Association ( AWPA ) Standard M2 . In addition, brand, hammer mark, ink stamp or tag each piece with the inspection company’s
unique mark to indicate it has been inspected. All inspections shall be completed at no cost to the Department. -2 UNTREATED TIMBER AND LUMBER Lumber that is 2 inches to 4 inches thick and 2 inches to 4 inches wide shall conform to Structural Light Framing, Grade No. 1 Dense MC19. Lumber that is 2 inches to 4 inches thick and 6 inches wide or wider shall conform to Structural Joists and Planks, Grade No. 1 Dense MC19. Lumber that is 5 inches and thicker along the least dimension shall conform t o Dense or Select Structural (Sel Str ). Rough lumber will be acceptable except where surfacing is called for by the contract. Rough lumber may vary ± 1/4 inch from the dimensions shown on the contract or bill of material. -3 TREATED TIMBER AND LUMBER
Grade marked lumber will not be required. Brand or ink stamp each piece of treated lumber in accordance with the AWPA Standard M6. After treatment, handle the timber and lumber carefully to avoid breaking through the treated layer. This includes using rope slings, without sudden dropping, breaking of the fibers, bruisi ng or penetrating the surface with tools or hooks. All drilled holes or cuts should be at least 1 foot above the earth to limit the potential for decay , with the exception of sign and guardrail end unit posts which are allowed .
Lumber for bridges or fender systems that is 2 inches to 4 inches thick and 2 inches to 4 inches wide shall conform to Structural Light Framing, Grade No. 1 Dense. Lumber for bridges or fender systems that is 2 inches to 4 inches thick and 6 inches wide and wider shall conform to Structural Joists and Planks, Grade No. 1 Dense. Timbers for bridges or fender systems that are 5 inches and thicker along the least dimension shall conform to Structural Lumber, Dense or Select Structural (Sel Str) . Lumber for fender systems shall conform to Dense or Select Structural (Sel Str ). Timber for piles shall meet ASTM D25 except that the timber shall be Southern Pine. Rough lumber will be acceptable except where surfacing is called for by the contract or bills of material. Rough lumber may vary ± 1/4 inch from the dimensions shown in the plans or bill of material.
Sawn timbers for guardrail posts , blockouts and related components shall be Southern Pine, conforming to Grade No. 1. Rough lumber will be acceptable. An allowable tolerance of 3/8 inch scant will be permitted from nominal dimensions.
Sawn fence posts and braces shall be Southern Pine, S4S, and conform to Grade No. 2 for posts up to 4 inches x 4 inches in cross section, and Grade No. 1 for posts larger than 4 inch x 4 inch in cross section. Round posts and braces shall meet Subarticle 1050 -2(A).
Lumber for sign posts no larger than 4 inches x 4 inches shall conform to Structural Light Framing, Grade No. 1. Lumber for sign posts larger than 4 inches x 4 inches and lumber for sign battens shall conform to Timbers, Grade No. 1. Use fully dressed S4S lumber for sign posts and battens. A tolerance of 1/ 2 inch scant will be permitted from nominal dimensions of sign posts. A tolerance of 1 inch under and 3 inches over will be permitted in the length of the post.
Timber for poles shall meet ANSI O5.1 except the timber shall be either treated Southern Pine or treated Coastal Douglas Fir. Use 40 f eet Class 3 poles unless otherwise specified in the contract. -4 PRESERVATIVE TREATMENT
All timber and lumber is required to be treated with a preservative treatment in accordance with AASHTO M 133 or AWPA Standards , using a wood preservative registered by the US Environmental Protection Agency under the Federal Insecticide, Fungicide and Rode nticide Act. Preservative t reated wood products will not be accepted for use unless they have been inspected and found satisfactory, both before and after treatment as provided in Article 12 -1, and shall be delivered to the project site in a condition acceptable to the Engineer. Use treating plants that have laboratory facilities at the plant site for use of the inspector in accordance with AWPA Standard T1. In areas of frequent human contact, the use of chromated copper arsenate (CCA) treated wood is not permitted . Instead use material treated to the applicable AWPA Use Category with an appropriate preservative system permitted by EPA . “Frequent h uman contact ” is defined as areas include decking, handrail and canopy posts, and rails of pedestrian bridges ; other instances of human contact areas may include fencing, decorative borders, and other uses of treated wood at recreational facilities such as welcome centers, rest areas and weigh stations .
Use timber preservatives conforming to AASHTO M -133 or AWPA Standard U1, Section 4, Table 1 .
Treat timber and lumber for bridges and fender systems in accordance with AASHTO M - 133 or AWPA Standard U1, Commodity Specification A: Sawn Products . Treat piles in accordance to AWPA Standard U1, Commodity Specification E: Round Timber Piling .
Treat guardrail posts , blockouts and related items in accordance to AASHTO M -133 or AWPA Standard U1, Commodity Specification A: Sawn Products, UC4B. The same type of preservative is to be used throughout the entire length of the project.
Treat sawn posts and braces in accordance with AASHTO M -133 or AWPA Stand ard U1, Commodity Specification A. Sawn Products, UC4B . Treat round posts and braces in accordance with AASHTO M -133 or AWPA Standard U1, except require retention of preservative as below. Before treatment, peel round posts and braces cleanly for their ful l length, remove all bark and cambium , and trim all knots and projections flush with the surface of the surrounding wood. Machine peeling will be permitted. Cut the ends to the proper length before treatment. The same type of preservative shall be used t hroughout the entire length of the project.