This specification describes the minimum requirements for grouting of structural steel members and equipment base plates.

Transcription

1 1/5 1.0 PURPOSE This specification describes the minimum requirements for grouting of structural steel members and equipment base plates. 2.0 SUBMITTALS Submit proposed grouting procedure, notify and obtain approval to proceed from the Vale Representative at least 24 hours prior to any grouting operation..0 MATERIALS.1 SHIMS Steel shims, minimum size 2 inch x 2 inch, thickness to suit. Do not use any shim plates less than 1/16 thick. The steel grade of the shims to be the same as that of the steel of base plate..2 GROUT Type of grout to be specified on the drawings or the scope of work. Cementitious Grout (ii) (iii) (iv) Nonshrink, nonrust material, noncorrosive, non-metallic, premixed grout. The grout must show no shrinkage according to ASTM C827 / C827M and United States Corps of Engineers Specification CRD C-621 The grout must contain no metallic powders such as aluminum or iron filings. Do not use ferrogrout. Epoxy Grout (ii) (iii) Nonshrink, premeasured, prepackaged epoxy-resin-base grout. Do not use solvents. The grout must show no shrinkage according to ASTM C1107/C1107M. Urethane Grout Premeasured, prepackaged urethane resin base grout.. SAND AND WATER In accordance with Canadian Standards Association Standard CAN/CSA - A2.1.

2 2/5 4.0 SURFACE PREPARATION 4.1 GENERAL Follow manufacturer's instructions and as specified herein. 4.2 Before steel base plate or equipment is set on foundation, chip away defective concrete and laitance leaving entire foundation reasonably rough but level. Clean surface of dirt and loose particles. Remove oil and grease. Clean out bolt holes. Chip concrete surfaces to a roughness of +/- ¼ amplitude. Prior to placing cementitious grout, saturate concrete with water for the period recommended by the grout manufacturer. Remove all free standing water. Do not wet concrete prior to placing epoxy or urethane grouts. 4. STEEL Clean underside of steel base plate or equipment of oil, grease, dirt and other impurities. Protect anchor bolts from fouling with grout. 4.4 FORMS After steel base plate or equipment has been placed, aligned, leveled and shimmed, install formwork to restrain grout. Place form around outside of foundation. On side where grout is to be poured, make formwork high enough to provide at least 6 inch "head" of grout or as per manufacturer recommendations. On all other sides provide "head" allowance of inches or as per manufacturer recommendations. Nail ¾ chamfer strip to the inside of form, placing top of the strip level with underside of base plate. Caulk forms to prevent leakage of grout and loss of "head" in accordance with manufacturer's instructions. 5.0 INSTALLATION Adhere to the requirements of CAN/CSA-A2.1 and to the grout manufacturer's instructions regarding handling, mixing, preparation, placing, finishing and curing of grout. Ensure the grout is providing full bearing under base plates or equipment bases. Minimum thickness of grout is 1 inch or as shown on the project drawings.

3 /5 5.1 SHIMMING Provide steel shim packs to support column or equipment. Use a minimum of four shim packs for each base plate. Use wedge shims on equipment bases, when directed by the Vale Representative. 5.2 POURING GROUT Place grout for each base plate in continuous pour from one side only to eliminate air pockets. Rod as required to compact and facilitate flow and provide full bearing under the equipment or base plate. Avoid overworking, segregation, bleeding and disturbing during initial set. Do not use vibrators. Fill and crown exposed areas to provide drainage and eliminate depressions. Do not extend grout up the sides of base plate or equipment. Protect finished surfaces and equipment from grouting materials. Prevent splatter or splash. For abnormal temperature grouting obtain approval to proceed in writing from the Vale Representative and the grout manufacturer. 5. FINISHING GROUT For equipment bases remove wedges and shims after grout has set and fill voids with grout. Cementitious Grout: After achieving initial set, trowel grout level between underside of base plate and top of chamfer strip. Epoxy and Urethane Grouts: Leave at final placement level. Do not trim after initial set. 5.4 CURING OF GROUT Follow manufacturer s instructions regarding curing of grout. Do not operate vibrating equipment that may disturb grout during curing. Do not load the grout until it has fully cured.

4 4/5 6.0 REFERENCE DOCUMENTATION The following documents are related to this specification and shall be used to their latest revision: CSA A2.1 Concrete materials and methods of concrete construction / Test methods and standard practices for concrete

5 5/5 7.0 REVISION AND TRANSITION NOTES Revision notes describe: what was changed, and if applicable, why it was changed, and the plan to implement the change, including whether changes are retroactive. Note: The revision notes are a summary of the changes and may not necessarily be a complete list. A risk code is entered for each revision and if applicable, the revision notes will describe how risk was addressed for the revision. Risk Code A Risk Category This revision is a minor change and/or introduces no risk. B C Risk has been addressed for this revision by the reviewer and approver. Low risk or no new hazards identified. For this revision, a PHR or other risk management tool has been used to address risk and minimize hazards. This risk assessment has been documented and is available through Central Engineering. Rev Revision Notes Risk Code Approved by Reviewed by Issue Date YYYY/MM/DD 1 Document format and number changed. Previous number Rev AA DB 2012/04/0 2 Approved for use in Thompson No Changes --- AA DB 2012/08/09 Document Reviewed Format updated Regional approvals removed Clarifications added A A.Alaeddine M.Fogarty