SCOPE
718.01.01 Materials Covered. This specification covers the quality requirements for structural timber, round
timber piles, lumber, guardrail posts and blocks, markers, miscellaneous items, and timber preservatives. This specification also covers the quality of bolts, nuts, washers, drift pins, dowels, nails, spikes, and other metal fastenings used in timber structures. REQUIREMENTS
718.02.01 Certificates of Inspection. Furnish inspection certificates with each shipment of timber. These
certificates shall be issued by the inspection agency under whose rules the material was manufactured and graded. Timber piles to be treated shall be inspected before t reatment by an inspector designated by the Engineer. The inspector shall stamp each pile on the butt end with a stamp which shall make an impression that is readily legible after treatment. The stamp shall be copyrighted and a true impression filed with th e Department. PHYSICAL PROPERTIES AND TESTS
718.03.01 Species. The standard commercial and botanical names recognized by these specifications are
described as follows: Standard Commercial Name Botanical Name Douglas Fir (coastal) .............................................. Pseudotsuga menziesii var. menziesii Douglas Fir (interior) ................................................ Pseudotsuga menziesii var. glauca Western Hemlock .............................................................. Tsuga heterophylla Western Larch ................................................................... Larix occidentalis Lodgepole ................................ ........................................ Pinus contorta Redwood ................................ ................................... Sequoia sempervirens Southern Pine ....................................................................... Pinus taeda Ponderosa Pine ................................ .................................. Pinus ponderosa Jack Pine ................................ ....................................... Pinus banksiana
718.03.02 Grades. Structural timber and lumber shall meet the requirements for the numerical stress shown on
the plans, or as may be otherwise specified, when graded by rules developed according to AA SHTO M168. Any commercial grading rules that will provide material of an equal or greater stress value may be used. The West Coast Lumber Inspection Bureau and the Western Wood Products Association grading rules shall be included as grading rules which ma y be used. Grading rules in effect on the date of advertisement of bids shall govern. Guardrail posts and blocks shall meet the following requirements:
1.Douglas Fir or Western Larch shall conform to the requirements for “No. 1 Structural” grade as set forth in the grading rules of the West Coast Lumber Inspection Bureau or the grading rules of the Western Wood Products Association.
2.Western Hemlock shall conform to the requirements for “Select Structural” grade as set forth in the grading rules of the West Coast Lumber Inspection Bureau or the grading rules of Western Wood Products Association.
3.Southern Pine shall conform to the requirements for “No. 1 SR” grade as set forth in the grading rules of the Southern Pine Inspection Bureau. Timber piles shall conform to ASTM D25. 718 TIMBER MATERIAL
718.03.03 Preservatives. The following preservatives listed in these specifications shall conform to the
requirements of the referenced American Wood- Preservers’ Association (AWPA) Standards:
a.Creosote shall confor m to AWPA Standard P1.
b.Creosote- Solution shall conform to AWPA Standard P2.
c.Creosote- Petroleum shall conform to AWPA Standard P3.
d.Pentachlorophenol shall conform to AWPA Standard P8.
e.Ammoniacal Copper Arsenate (ACA), Ammoniacal Copper Z inc Arsenate (ACZA), and Chromated Copper Arsenate (CCA), Type A, B, or C, shall conform to AWPA Standard P5.
f.Copper Naphthenate shall conform to the requirements of AWPA Standard P8. Use a method of seasoning, conditioning, and treating conforming t o AWPA Standards for each usage. The minimum amount of preservative retained per cubic meter (cubic foot) of timber, lumber, or piling shall conform to the minimum specification requirements shown in Table I of this Subsection. TABLE I PRESERVATIVE TREATMENTS Usage and Wood Species Type of Preservative Treatment and Minimum Retention - kg/m3 (lb/ft3) of wood AWPA Treatment Standard A B C D E F G (c) Posts and Blocks for Guardrail: Coastal Douglas Fir, Western Larch, Western Hemlock, and Southern Pine 128.0 (8.0) — 8.0 (0.50) 8.0 (0.50) 8.0 (0.50) 8.0 (0.50) (d) 1.2 (0.075) UC4B Posts and Braces for Fences: Coastal or Interior Douglas Fir (a), Western Larch, Southern Pine, and Lodge pole Pine Round 128.0 (8.0) 128.0 (8.0) 6.4 (0.40) 6.4 (0.40) 6.4 (0.40) 6.4 (0.40) (e) 0.90 (0.056) UC4B Sawn Four Sides 160.0 (10.0) 160.0 (10.0) 8.0 (0.50) 8.0 (0.50) 8.0 (0.50) 8.0 (0.50) (d) 1.0 (0.062) UC4B Posts for Signs: Coastal or Interior Douglas Fir, Western Hemlock, and (b) 160.0 (10.0) 160.0 (10.0) 8.0 (0.50) 8.0 (0.50) 8.0 (0.50) 8.0 (0.50) (d) 1.0 (0.062) UC4B Round Timber Piles: Southern Pine 160.0 (10.0) 160.0 (10.0) 9.6 (0.60) 12.8 (0.80) 12.8 (0.80) 12.8 (0.80) — UC4C Round Timber Piles: Costal or Interior Douglas Fir, and Western Larch 160.0 (10.0) 160.0 (10.0) 13.6 (0.85) 16.0 (1.0) 16.0 (1.0) — — UC4C A = Creosote or Creosote- Petroleum B = Creosote- Solution C = Pentachlorophenol D = ACA E = ACZA F = CCA G = Copper Naphthenate
a.Interior Douglas Fir is not allowed for round posts.
b.Any other equivalent stress rated wood.
c.As kg/m3 (lb/ft3) copper.
d.Coastal Douglas Fir and Southern Pine only.
e.Copper Naphthenate in AWPA P9 Hydrocarbon Solvent Type A and only for Douglas Fir, Southern Pine, or Lodgepole Pine. The treating plant shall imprint legible symbols in the treated material indicating the name of the treating company and the type and year of treatment according to AWPA Standards. TIMBER MATERIAL 718 Furnish inspection certifications from the supplier stating that the treated material complies with all the requirements of these specifications. Each certification shall include a listing of the material being supplied and have attached a certified test report as detailed i n AWPA Standards from the plant inspector. All materials and processes used in the manufacture of treated material may be subjected to inspection, acceptance, or rejection at the manufacturer’s plant. Equip the plant with all the necessary gages, applianc es and facilities to enable the inspector to satisfy himself that the requirements of the specifications have been fulfilled. Care and handle pressure treated wood according to AWPA Standards .
718.03.04 Hardware. Galvanize iron and steel hardware, according to ASTM A153.
Bolts, nuts, dowels, and drift pins shall conform to ASTM A307, Grade A. Fabricate cast washers of cast iron of the O -gee type. The diameter shall be not less than 3.5 times the diameter of the bolts. The diameter of the hole shall be 3 mm (1/8 in.) larger than the diameter of the bolt. Fabricate flat malleable washers of malleable iron with ribs properly proportioned to develop the full strength of the bolt. The diameter shall be not less than 3.5 times the diameter of the bolt for whi ch it is used, and the thickness shall be equal to one- half the diameter of the bolt. The diameter of the hole shall be 3 mm (1/8 in.) larger than the diameter of the bolt. Use a standard commercial type of cut or round nail. Use cut, round or boat spikes, as specified. SECTION 7 19 RIPRAP SCOPE
719.01.01 Materials Covered. This specification covers the types and quality of riprap and riprap bedding.
REQUIREMENTS
719.02.01 General. Material for riprap and riprap bedding shall be hard, durable, angular in shape; resistant to
weathering and water action; free from overburden, spoil, shale, and organic material; and shall meet the gradation requirements specified. Control of gradation will be by visual inspection. If directed, provide 2 samples of material of a least 5 metric ton (5.5 ton) each, meeting the gradation specified. Provide one sample at the construction site, which may become part of the finished work . Provide the other sample at the quarry. These samples will be used as a frequent reference for judging the gradation of the material supplied. Resolve any difference of opinion between yourself and the Engineer by dumping and checking the gradation of 2 random truck loads of material . Provide mechanical equipment, a sorting site, and labor needed to assist in checking the gradation. PHYSICAL PROPERTIES AND TESTS
719.03.01 Stone for Riprap . This stone shall conform to the following requirements:
RIPRAP GRADATIONS mm (in.) CLASS DESIGNATIONS Percent Passing by Mass 150 300 400 550 700 900 100 ..................... 250 (10) ............. 500 (20) ............ 750 (30) ............ 1000 (40) ........... 1200 (48) .......... 1500 (60) 70-85 .................... 225 (9) .............. 450 (18) ............ 675 (27) ............. 900 (36) ............ 1125 (45) .......... 1350 (54) 35-50 .................... 150 (6) .............. 300 (12) ............ 450 (18) ............. 600 (24) ............. 750 (30) ............ 900 (36) 5-15 ...................... 50 (2) ................ 125 (5) .............. 175 (7) ............. 300 (12) ............. 450 (18) ............ 600 (24) 0-5 ....................... 25 (1) ................. 50 (2) ................ 75 (3) ............... 150 (6) ............... 200 (8) ............. 300 (12) Source Requirement Tests Test Method Requirements Percentage of Wear, 500 Rev . ................................ ..................... AASHTO T96 ............................................ 45% Max. Specific Gravity ................................ ................................ .................. Nev. T104 .............................................. 2.5 Min. The largest dimension of a single riprap stone shall be no larger than 3 times the smallest dimension. Rounded stone or boulders will not be accepted. Shale and stone with shale seams are not acceptable.
719.03.0 2 Aggregate for Riprap Bedding. This aggregate shall conform to the following requirements:
CLASS 150 RIPRAP BEDDING CLASS 300/400 RIPRAP BEDDING Sieve Size Percent Passing by Mass Sieve Size Percent Passing by Mass 25 mm (1 in.) .............................. 100 150 mm (6 in.) .............................. 100 16 mm (5/8 in.) ............................ 70-85 125 mm (5 in.) ............................. 70-85 9.5 mm (3/8 in.) ............................ 35-50 75 mm (3 in.) .............................. 35-50 6.3 mm (1/4 in.) ............................. 5-15 25 mm (1 in.) ............................... 5-15 4.75 mm (No. 4) ............................. 0-5 12.5 mm (1/2 in.) ............................ 0-5 CLASS 550/700 RIPRAP BEDDING CLASS 900 RIPRAP BEDDING Sieve Size Percent Passing by Mass Sieve Size Percent Passing by Mass 250 mm (10 in.) ............................. 100 500 mm (20 in.) ............................. 100 225 mm (9 in.) ............................. 70-85 450 mm (18 in.) ............................ 70-85 150 mm (6 in.) ............................. 35-50 300 mm (12 in.) ............................ 35-50 50 mm (2 in.) .............................. 5-15 125 mm (5 in.) .............................. 5-15 25 mm (1 in.) ............................... 0-5 50 mm (2 in.) ............................... 0-5 Source Requirement Tests Test Method Requirements Percentage of Wear, 500 Rev. ................................ ..................... AASHTO T96 ............................................ 45% Max. Specific Gravity ................................ ................................ .................. Nev. T104 .............................................. 2.5 Min.
Source: Nevada Standard Specifications for Road and Bridge Construction, 2014 Edition. Pages 565–568 of 610.