HomeMy WebLinkAbout030100 Maintenance of ConcreteSECTION 030100 - MAINTENANCE OF CONCRETE
PART 1 GENERAL
1.1 RELATED DOCUMENTS
A. Drawings and general provisions of contract, including general and supplementary conditions and Division 1 specification sections, apply to work of this section.
1.2 QUALITY ASSURANCE
A. Before work of this section proceeds, a meeting is required between the Owner's representative, Contractor, Engineer, and manufacturers’ representatives to review pending repairs
and repair procedures.
B. Protect surfaces from rapid drying.
C. Do not apply materials if temperature is below 45°F.
D. Use workers who are skilled and experienced in this type of work.
E. Materials used must be compatible.
1.3 RELATED SECTIONS
A. Section 024119-33, Concrete Removal for Repair.
1.4 SUBMITTALS
A. Submit manufacturer's specifications and instructions for material to be provided.
1.5 QUALIFICATION OF WORKMEN
A. Provide at least one person who shall be present at all times during execution of the work of this section and is thoroughly familiar with the specified requirements and the materials
and methods needed for their execution and who shall direct work performed under this section.
1.6 PRODUCT HANDLING
A. Deliver materials to job site in original, new, and unopened packages and containers bearing the
manufacturer's name and label.
B. Protect concrete repair systems before, during, and after installation and protect the work and materials of other trades. In the event of damage, immediately make repairs and replacements
necessary to the approval of the Owner and at no additional cost.
1.7 TESTING
A. Test patched areas after three days for soundness and delamination by sounding with a hammer. Repair all hollow-sounding areas by replacing the patch in the affected area at no cost
to the Owner.
PART 2 PRODUCTS
2.1 MATERIALS
A. Corrosion-resistant Coating for Existing Reinforcing: Two component polymer modified silica-fume cementitious coating tested under FHWA/RD-86/193 procedure.
B. Vertical and Overhead Trowel Applied Patching Material: “Sika Top 123 Plus” by Sika Corporation; “Conpro Set” by Conproco Corporation; “EMACO R350 CI” by Master Builders Technologies;
“SW-82” (vertical) by Strong Wall Systems; or accepted equivalent.
C. Aggregate: Hard, sound, and durable pea gravel 1/4 to 3/8 inch.
PART 3 EXECUTION
3.1 JOB CONDITIONS
A. Examine conditions under which concrete shall be reconditioned. Do not proceed with work until unsatisfactory conditions are corrected.
3.2 SURFACE PREPARATION
A. Prepare the area to be patched according to Section 024119-33.
B. Coat existing exposed reinforcement with corrosion-resistant coating. Reinforcement to be coated shall be sandblasted clean in accordance with the coating manufacturer's recommendations.
3.3 WALL, COLUMN, OR BEAM SHALLOW REPAIR
A. Apply bonding grout to surfaces to receive patching. Apply grout to a uniform thickness 1/16 to 1/8
inch thick. Coating may be retempered with a second coat if the first coat dries before placing patching materials. Reclean cavity if second coat dries.
B. Place trowel-applied patching compound in cavity, ensuring materials are well-consolidated. Place in lifts as recommended by the manufacturer. Apply trowel finish to surface.
C. Protect and cure surface in accordance with the manufacturer's recommendations.
END OF SECTION 030100 (3/09)