1、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TT-W-535 - W o o d Preservative; Fluor- ChromeAr- senate-Phenol Mix- ture. MILITARY MIL-V-1174 - Varnish, Spar, Wa- ter Resisting (Formula .No. 80). MIL-W-19463 - Wood ; Moisture Con- tent Determina- ti
2、on. MIL-W-18142 - W o o d Preservative Solutions; Oil Sol- uble; Ship and Boat Use. MIL-A-22397 - Adhesive, Phenol and Resoi*cinol R e s i n Base (for Marine Service Use). MILL24126 - Conditions Controlled to Prevent Surface Checking. STANDARD MLLITARY MIL-STD-105 - Sampling Procedures and Tables fo
3、r In- spection by Attri- butes. (Copies of specifications, standards, and draw- ings required by supplier in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) 2.2 Other publications. The following documents form
4、a part of this specification to the -extent specified herein. .i Unless other- wise- indicated, the issue in. effect on date of invitation for bids or -request for pro- posal shall apply. 2 AMERICAN SOCIETY FOR TESTING MA- TERIALS ASTM D 246- 64T - Methods for Estab- lishing Structural Grades of Lum
5、ber. (Copies may be obtained from the American SCP ciety for Testing and Materials 1916 Race street, Philadelphia, Pennsylvania 19103.) AMERICAN WOOD PRESERVERS ASSOCIA- TION ( AWPA) PUBLICATIONS A%-Methods for Analysis of Water- Borne Preservatives and Fire Re- tardant Formulations. A3-Methods for
6、Determining Penetra- tion of Preservatives. A7-Standard Wet Ashing Procedure for Preparing Wood for Chemical Analysis. (Copies may be ,obtained from the Secretary- Treasurer of the American Wood Preservers As- sociation 839 17th Street, N.W., Washington, D.C. 20006.) U.S. DEPARTMENT OF COMMERCE Comm
7、ercial Standard CS 2534truc- . tural Glued Laminated Timber. (Application for copies should be addressed :to the Superintendent of Documents, Government Printing Office, Wa.shington, D.C. 20402.) ASSOCIATION OF AMERICAN RAILROADS Rules Governing the Loading of Forest Products on Open Top Cars; (Appl
8、ication for copies should be addressed to the Association of American RFiIroads, 69 Van Buren Street, Chicago, Ill. SOSOS.) (Technical society and technical association speci- fications and standards are generally available for reference from libraries. They are also distributed among technical grou
9、ps and using Federal agencies.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I. REQUIREMENTS 3.1 Prior to award of contract or ordes, when, a manufacturer has not produced oak laminates within the past 24 months con- forming to this specification
10、for the class specified, and species or combination to be used, shall be submitted certifying the fol- lowing (see 6.9) : (a) Tests on laminates produced show conformance with the perform- ance requirements of this speci- fication for the class specified or species conibination to be used, as eviden
11、ced by an identified re- port (see 3.6). (b) The manufacturer is equipped to continue to produce material of quality equal to that tested, in the amount of the order and within the delivery date as evi- denced by plant facilities, man- power and quality control capa- bility (see 4.1.1). Appendix A o
12、f MIL-W-24126 shall be used as a guide to de- termine the adequacy of the fa- cilities and personnel producing laminates under this specifica- tion. Evidence of conformance under CS 263 may be offered for review in fulfillment of these re- MILW-15.154E quirements subject to the re- quirements of thi
13、s specification. 3.2 Lamination quality. Oak laminations used in laminated assemblies shall be one piece for length and width. Edge-joints and end joints may be used to form laminations of the required dimensions. Laminations (includes edge-glued and end-glued compo- nents) used in laminated assembl
14、ies shall be free from splits, surface checks over 1/32- inch wide or over 4-inches long, ring shake, honeycomb, collapse, case-hardening, or oversteaming (see 4.5.2), wane, decay in my stage, and other defects except as per- mitted herein. 3.2.1 Moisture content. The moisture con- tent of the lumbe
15、r at the time of gluing shall be not less than 10 nm more than 16 percent. The moisture content of the core as determined by a distribution section (see figure 1) taken from any boards shall not vary from that of the shell by more than 2 percent. 32.2 Grade of lumber. Grades and max- imum allowable
16、defects shall be in accord- ance with the table I, 3.2.2.1, 3.2.2.2 and 3.2.2.3 (see 6.2). For laminates intended for remanufacture into smaller cross-sec- tions, defect; limitations shall apply to end use in dimensions. TABLE I. Permissible slope of grain, knots, and equivalent knot defect8 for la
17、01 (b) White oak, containing bright sap- wood on not less than 75 percent of the area of any face or edge in any two feet of length, t r e a t e d in accordance with 3.2.4.1.1 through 3.2.4.1.4. 3.2.4.1.1 Pwpa.i.ation for twatment. The lumber before treatment shall be seasoned to a moisture content
18、of not more than 25 percent for proper impregnation with pre- servative, and shall be dressed uniformly on both sides. The thickness after surfacing shall be such that when laminations are surfaced for laminating after treatment and drying, the amount of treated wood removed from each face shall be
19、as small as prac- ticable. 3.2.4.1.2 Preswvatve rnatel.icll (f 1 u o r - chrome-arsenate-phenol mixture). The pre- servative chemicals shall conform to either type A or B of TT-W-535. The treating so- lution shall be of a concentration suitable to 5 Provided by IHSNot for ResaleNo reproduction or ne
20、tworking permitted without license from IHS-,-,-MIL-W-LSL5qE 55 7777906 02LL33L 7 I MIG.W-1515PE produce a retention of 0.50 pound of dry salt per cubic foot of wood in the white oak sapwood portion and in the red oak heart- wood and sapwood, mitted in the same laminate, provided data is presented s
21、howing conformance to the performance requirements of this specifica- tion (see 3.1). 3.2.4.1.3 TTeatment. The treatment shall be any method which does not use pressure higher than 1500 pounds per square inch (p.s.i.) or a temperature higher than 140“ Fahrenheit (F.), and provides 100 percent penetr
22、ation of preservative in the White oak sapwood and penetration of 80 percent of the annual rings in red oak heartwood and sapwood (see 4.4.1.3). Incising of the lum- ber is not permitted. Dry salt retention shall he not less than 0.50 pounds per cubic foot of wood, in the treated zone of samples (se
23、e 4.5.7.1). 3.4.1 Lcminakion thickness. All lamina- tions in a given laminate shall be approxi- mately the same thickness. The maximum lamination thickness for straight laminates shall be y8 inch after final surfacing. The maximum permissible lamination thickness for curved laminates shall be comput
24、ed from the relationship : 1 = .o1 - Thickness Radius of curvature - 100 3.2.4.4 Conditmhg of lumbeT after treatment. Lumber shall be dried to the required moisture content by either air dry- ing or kiln drying, using temperatures less than 160F. and relative humidity controlled as necessary to prev
25、ent drying defects. 3.2.4.2 Glass 2 (good decay resstance). White oak laminations shall be free of sap- wood. Untreated red oak is not permitted. Red oak or white oak sapwood is permitted if treatedss specified in 3.2.4.1. 3.2.4.3 Cluss 3 (modeTate decay Tesis- tance). White oak laminations shall co
26、n- tain bright sapwood on not more than 25 percent of the area of any face or edge, in any two feet of length. Untreated red oak is not permitted. Red oak or unlimited white oak sapwood is permitted if treated as specified in 3.2.4.1. 3.3 Adhesives. Adhesives used for all gluing operations shall con
27、form to MIL-A- 22397. 3.4 Construction. A laminate shall con- sist of layers of laminations joined together by the adhesive specified in 3.3 in accord- ance with the process requirements of 3.6. White oak and treated red oak are per- 6 When bending laminations to curved forms, breakage of any lamina
28、tion, failure of any end-joint, or observance of compression wrinkles, splitting, splintering or other in- dications of bending damage, shall result in rejection of the laminate unless the dam- aged lamination is replaced by a sound one within the assembly time of the adhesive used. 3.4.2 Arrangemen
29、t of end joints. Lami- nated assemblies may contain end joints in individual laminations of the design speci- fied in 3.6.1.2. End joint spacing within the laminate shall meet one of the following arrangements as specified (see 6.1.6 and 6.2). Arrangement I-Spacing of adjacent end joint tips at a gl
30、ueline shall be not less than 6 inches. Any plane at right angles to the longitudinal axis of the laminate that intersects an end joint shall not intersect any part of an end joint in the adjacent lamination to either side. Any within the cen- ter of the total depth the spacing shall be nbt less tha
31、n 2 inches. Any plane at right angles to the longitudinal axis of the laminate that intersects an end joint shall not intersect any part of an end joint in the adjacent lamination to either side. 3.4.3 Finished dimensions. Laminated oak members shall be manufactured to full dimensions required by th
32、e procuring ac- tivity and shall conform to the pattern lines as determined from templates or drawings furnished (see 6.2). 3.5 Process requirements. Edge-gluing of lumber components to produce laminations of required width and end-gluing of lumber components to form laminations of required length s
33、hall procede final surfacing and glu- ing of laminations except for laminations wider than 18 inches, one edge joint may be glued at the time of laminating. All other joints shall be pre-glued. 3.5.1 Machining of swfaces to be bonded. 3.5.1.1 Edge-swfaces. Strips of oak to be edge-glued for laminati
34、on width shall have a minimum width of 11/2 inches at the time of fabrication. Strips to be edge glued shall be machined to produce a uniform flat (without tongue and groove, or similar construction) and true surface with a mini- mum of damage to wood fibers. 3.5.1.2 End-swfaces. End-joining of lum-
35、 ber components for length shall use a plain flat scarf-joint with a slope not steeper than one inch rise in 12 inches of length. 3.5.1.3 Surf acing 2am.inatzons. Lamina- tions shall be dressed to a uniform thick- ness throughout, and the total thickness variation of any lamination at the time of gl
36、uing shall not exceed a maximum of 0.01 inch, determined with. an accurate thick- ness gage. Surfaces shall not show manu- facturing. defects to an extent which will prevent sufficient contact between gluing MIL-W-15154E surfaces for complete adhesion. Surfaces shall not be sanded to remove such def
37、ects after final surfacing. At the timo of gluing, after all surfacing, cup shall not exceed 1/32 inch for each inch in width in lumber $6 inch and less in thickness, and shall not exceed 1/64 inch for each inch in width for lumber over inch in thickness. The final surfaces for gluing shall be prepa
38、red not more than 24 hours before gluing is st arted. 3.5.2 Adhesive p?ead. The adhesive shall be applied uniformly to both contact faces. The amount of adhesive spread per unit area shall be in accordance with the adhesive manufacturers instruction for the particular adhesive being used. 3.5.3 Asse
39、mbly. At the time of gluing, the temperature of lumber materials and ambient air temperature shall be 75“ for pasts where replacement would be difficult and costly, and long time service is required. (b) Class 2-good decuy resktunce. For service where decay or insect hazard is moderately high, or ma
40、y be high at times, but vent- ilation and drying is generally possible and long time service is required. May be used under adverse decay conditions where a shorter service life can be tolerated. (c) Class 3-modemte decay resistance. For service where decay or in- sect hazard is not high or where oc
41、casional wetting occurs but good ventilation prevails and long time service is required; may be used in higher decay hazard locations where replace- ment or moderate service life can be tolerated; may be used under continuously submerged, waterlogged conditions. 6.1.5 End-joint arrangement, Arrange-
42、 ment 1 is intended for laminates which will be loaded primarily in tension. Arrange- ment 2 is intended for laminates which will be loaded primarily in bending. 6.2 Ordering data. Procurement docu- ments should specify the following: MLW-15154E (a) Title, number, and date of this specification. (b)
43、 Pre-award certification (see 3.1 and 6.9). (c) Thickness, width, length, shape (include drawings and sharpest radius of curvature, if curved members are required), and in- tended use (for example frame, keel, etc.) of laminates (see 3.4.3 and 3.9). (d) Grade of laminations and type, and class of la
44、minates (see 3.2 and 6.1.2). (e) Arrangement of end-joints in lam- inates (see 3.4.2 and 6.1.5). (f) Side coatings, if required (see 3.8 and 6.8). (g) That the contractor should pile material on stickers when stored outside, and protect it from pre- cipitation and the direct rays of the sun, if side
45、 coatings are not specified (see 6.8). -. (h) Marking of individual laminates and shipment markings (see 3.9 and 5.1.1.3). 6.3 Definitions. 6.3.1 Lamhate. For purposes of this specification a laminate is considered to be an adhesive-bonded assembly consisting of layers of wood with their grain runni
46、ng in the same direction. 6.3.2 Lamination. A lamination is a single layer of wood used or-to be used in a laminated assembly. A lamination may Laminate classes do not refer to marine borer resistance. For direct exposure to marine borers (Toredo, Bad hence, sapwood of white oak is restricted and re
47、d oak is not pes- mitted in this specification unless preserva- tive treatment is given (see 3.2.4.1 and 3.2.4.2). 6.4.1 Vhl identification. It is possible to separate the red oak from white oak by visual examination. The color of the wood is a ready but not absolutely reliable means of distinguishi
48、ng the wood of the white oak group from that of the sed oak group. The wood of the latter group usual- ly has a distinctly reddish tinge, especially near the knots. The wood of the white oak group is generally a grayish brown, but occasionally a reddish tinge is found in white oak lumber. Fos more a
49、ccurate ident- fication it is necessary to examine the pores of the wood, which appear as tiny holes on a smoothly-cut end surface. They vary in size throughout each growth ring, being larges in the spring-wood where they are visible to the eye, decreasing in size abrupt- ly toward tne gummerwood. The large pores in the springwood of the heartwood and inner sapwood of the woods of the white oak group are usually .plugged up with a froth-like growth called tyloses, and those of the red oak group are open. This
