AASHTO HB-17 DIVISION II SEC 17-2002 Division II Construction - Preservative Treatment of Wood《木材防腐处理》.pdf

1、Section 17 PRESERVATIVE TREATMENT OF WOOD 17.1 GENERAL This work shall consist of treating wood, including lumber, timber, piles and poles, with designated preserv- atives in accordance with these Specifications. It shall in- clude furnishing all materials, preparing, treating, and performing all wo

2、rk to complete treating the wood prod- ucts required for the project. The type of preservative treatment required shall be as specified in the special provisions or as noted on the plans. When a specific type of preservative is not called for, the kind of preservative to be used shall be adopted for

3、 its suitability to the conditions of exposure to which it will be subjected and shall be subject to approval of the Engineer. The handling and care of treated woods shall conform to the requirements of Sections 4, “Driven Foundation Piles,” and 16, “Timber Structures.” 17.2 MATERIALS 17.2.1 Wood Pi

4、ling shall conform to the requirements of Section 4, “Driven Foundation Piles.” Timber and lumber shall con- form to the requirements of Section 16, “Timber Struc- tures.” 17.2.2 Preservatives and Treatments Timber preservatives and treatment methods shall con- form to AASHTO M 133. The type of pres

5、ervative fur- nished shall be in accordance with that specified or as noted on the plans. It should be noted that AASHTO M 133 designates the preservatives and retentions recom- mended for Coastal Waters and in marine structures and further that timber for use in “ground or water contact” has requir

6、ements that differ from timbers for use “not in ground or water contact.” In some instances there is a range of retentions offered which provides for different degrees of exposure based on climate or degree of insect infestation. Unless the higher retentions are specified, not less than the minimum

7、retention is required. Unless otherwise specified in the Special Provisions or shown on the design drawings, timber railings and posts and timber that are to be painted shall be treated with pentachlorophenol with a Type C solvent or with a water-borne preservative of either Type CCA or ACZA. 17.2.3

8、 Coal-tar Roofing Cement For purposes of these specifications pitch, coal-tar pitch, coal-tar roofing pitch, or coal-tar roofing compound shall mean coal-tar roofing cement wherever the terms are used. Coal-tar roofing cement is a residue of the manu- facturing of coke and creosote from bituminous c

9、oal. It shall be a thick, heavy-bodied, and paste-like material. When called for, it can be mixed with creosote. It may or may not contain fibrous material. 17.3 IDENTIFICATION AND INSPECTION 17.3.1 Branding and Job Site Inspection Each piece of treated timber shall bear a legible brand, mark, or ta

10、g indicating the name of the treater and the specification symbol or specification requirements to which the treatment conforms. Treated wood products bearing the quality mark of the American Wood Pre- servers Bureau (AWPB) will be acceptable. The Engi- neer shall be provided adequate facilities and

11、 free access to the necessary parts of the treating plant for inspection of material and workmanship to determine that the con- tract requirements are met. The Engineer reserves the right to retest all materials after delivery to the job site and to reject all materials which do not meet the re- qui

12、rements of the contract; provided that, at the job site reinspection, conformance within 5% of contract re- quirements shall be acceptable. Reinspection at the job site may include assay to determine retention of preser- vatives and extraction and analysis of preservative to de- termine its quality.

13、 615 616 HIGHWAY BRIDGES 17.3.2 17.3.2 Inspection at Treatment Plant Unless otherwise specified, inspection of materials and preservative treatment shall be the responsibility of the Contractor and the supplier of treated wood products. In- spections shall be conducted in accordance with AASHTO Spec

14、ification M 133 (AWPA Standards) by the treater or an independent commercial inspection agency approved by the American Wood Preservers Bureau (AWPB) and the Engineer. The inspection agency shall be engaged by the Con- tractor directly or through his or her supplier. No direct compensation will be m

15、ade for these inspection costs, it being understood that the costs of inspection are included in the contract bid prices for treated wood products or con- struction items of work. 17.3.3 Certificate of Compliance Whenever specified or requested by the Engineer, a certificate of compliance with copie

16、s of the inspection re- ports attached shall be furnished to the Engineer with each shipment of material. Such certificates shall identify the type of preservative used and the quantity in pounds per cubic foot (assay method) and shall be signed by the treater or the qualified independent inspection agency. 17.4 MEASUREMENT AND PAYMENT No separate measurement and payment will be made for preservative treatment as such work is a part of the work included in furnishing preservative treated materials.