for Highway Construction Page 671 of 71 5 SECTION 709 – CONCRETE CURING MATERIALS AND ADMIXTURES
709.01 Membrane -Forming Curing Compound.
Meet: System 1. ASTM C309 Type 1- D Class B with Fugitive Dye. System 2. ASTM C309 Type 2 Class B, White Pigmented.
709.02 Concrete Admixtures – General.
If more than 1 admixture is used, use the same brand from the same manufacturer and ensure it is compatible and can be dispersed in accordance with the manufacturer’s written instructions. Do not use admixtures containing chlorides, fluorides , sulphites, and nitrates. Do not use accelerating admixtures for mass concrete placements.
709.03 Air-Entraining Admixtures .
Meet AASHTO M 154.
709.04 Set R etarding Admixtures .
Meet ASTM C494.
709.05 Water -Reducing Admixtures .
Meet ASTM C494.
709.06 Lithium Nitrate Admixtures .
Provide lithium nitrate admixture consisting of a 30 percent aqueous lithium nitrate solution. Use the same brand and from the same manufacturer in the mix design and used in the concrete alkali silica reaction mitigation testing for the lithium nitrate admixture used in the concrete. Follow the manufacturer’s written instructions. for Highway Construction Page 672 of 71 5 SECTION 710 – TIMBER AND PRESERVATIVES
710.01 Structural Timber and Lumber .
Provide Douglas Fir or Larch structural timber and lumber of the grade specified. Ensure grade of structural timber and lumber is determined using the current version of the Western Wood Products Association (WWPA) standard grading rules of western lumber. Ensure wood is incised and treated to meet the American Wood Preservers Association (AWPA) StandardU1, Commodity Specification A: Sawn Products.
710.02 Wood Sign Posts .
Provide sign posts surfaced four sides (S4S) and free of wane and decay. Ensure ends are cut square and the post incised on all 4 sides before treating. Checks will not be more than 1/4 inch in width. The E ngineer will not accept twisted pieces. Ensure sweep is limited to 1 inch per 10 feet. Incise in accordance with AWPA U1, Commodity Specification A: Sawn Products, and pressure treat as specified in 710.09. Provide treated and graded Douglas F ir or Hem- Fir sign posts. Use the current version of the West Coast Lumber Inspection Bureau (WCLIB) or the WWPA to meet the following grades and requirements: Table 710.02- 1: Wood Sign Post Grades and Requirements Species Grade Douglas Fir 4” by 4” 85 percent of the sign posts free of heart center. Structural light framing, No. 2 grade in accordance with WCLIB paragraph 124c or WWPA paragraph 42.12. 4” by 6” 85 percent of the sign posts free of heart center. Structural joists and planks, No. 2 grade in accordance with WCLIB paragraph 123c or WWPA paragraph 62.12. 6” by 6” or 6” by 8” or 8” by 8” Posts and timbers, No. 1 grade in accordance with WCLIB paragraph 131b or WWPA paragraph 80.11. Hem -Fir 6” by 6” or 6” by 8” or 8” by 8” Posts and timbers, select structural in accordance with paragraph 131a WCLIB or paragraph 80.10 WWPA. Provide posts inspected and certified in accordance with the designated current grading and dressing rules of the WCLIB or the WWPA. Submit a certificate of inspection executed by the WCLIB, the WWPA, or the Pacific Lumber Inspection Bureau (PLIB ) at the time of delivery. Ensure certificates of inspection identify the destination or FOB for which the material is intended and each piece is inspected, certified, and stamped with an inspection mark. Such certification or grade marking does not constitute final acceptance of the material , and the Engineer may reject lumber or timber that does not meet specifications.
710.03 Timber Guardrail Posts and Timber Blockouts.
Provide rough surfaced 2 sides (S2S ) or 4 -sided (S4S) wood guardrail posts and wood blockouts. Do not exceed the size tolerance of plus or minus 1/4 inch for rough sawed blocks. Provide incising that meets AWPA U1, Commodity Specification A: Sawn Products, and pressure treat as specified in 710.09.