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HomeMy WebLinkAboutAPPROVED Concrete Repair Specifications-Digitally Signed 751 Northlake Boulevard, Suite 2C ♦ North Palm Beach, Florida 33408 Office (561) 844-4060 ♦ Facsimile (561) 844-1001 www.struc-engineers.com The Admiral Owners Association – Concrete Repair Specifications Page 1 of 9 CONCRETE RESTORATION PROJECT SPECIFICATIONS FOR THE ADMIRAL OWNERS ASSOCIATION, INC. 8750 S. Ocean Drive Jensen Beach, FL 34957 AUGUST 23RD , 2021 Prepared By: David T. Colston FL P.E. #55501 This document has been digitally signed and sealed by David T Colston, P.E.; FL No. 55501. Printed copies of this document are not considered signed and sealed and the signature must be verified on any electronic copies. 751 Northlake Boulevard, Suite 2C ♦ North Palm Beach, Florida 33408 Office (561) 844-4060 ♦ Facsimile (561) 844-1001 www.struc-engineers.com The Admiral Owners Association – Concrete Repair Specifications Page 2 of 9 751 Northlake Boulevard, Suite 2C ♦ North Palm Beach, Florida 33408 Office (561) 844-4060 ♦ Facsimile (561) 844-1001 www.struc-engineers.com The Admiral Owners Association – Concrete Repair Specifications Page 3 of 9 SCOPE OF WORK Project Description The project consists of concrete repair/restoration of the roof cooling tower beam and column supports. General Project Procedure The scope of work to be performed under the terms of the Contract includes furnishing all materials, labor, services, utilities, permit applications, supervision, tools, swing stages and/or scaffolding, and equipment required or incidental to the Project. All measurements are to be verified in the field by the Contractor and Engineer. Other dimensions are to be taken from the original building plans. The work will include, but is not necessarily limited to, the following elements: 1. Repair deteriorated concrete elements at locations directed/identified by the Engineer and in accordance with these specifications. The Engineer will advise and approve the limits and extents of removal of concrete and/or stucco during construction inspections. Use only materials per this specification unless specifically approved by the Engineer. 2. Clean and remove debris from the site. Repair/replace building components and/or landscaping damaged as a result of Contractor’s performance of work. DEFINITIONS The term “Owner” or “Association” is hereby defined as The Admiral Owners Association, Inc. or their appointed representative or agent. 1. The term “Engineer” is hereby defined as Structural Engineering Professionals, Inc. or their duly appointed representative or agent. 2. The term “Contractor” is hereby Daniello Construction II Corporation that is under direct contract with the Owner for the Work. The term “Subcontractor” refers to companies, firms, or organizations working for the Contractor. SUBJECT PROPERTY LOCATION The Admiral Owners Association, Inc. 8750 S. Ocean Drive Jensen Beach, FL 34957 751 Northlake Boulevard, Suite 2C ♦ North Palm Beach, Florida 33408 Office (561) 844-4060 ♦ Facsimile (561) 844-1001 www.struc-engineers.com The Admiral Owners Association – Concrete Repair Specifications Page 4 of 9 ENGINEERING (GENERAL) Inspections All required engineering inspections are to be scheduled with Engineer a minimum of 48 hours in advance. Failure to do so can result in delay of work or denial of item to be inspected. 1. During onsite engineering inspections, the Engineer shall review any work underway, regarding work locations, methods, shoring, forms, safety, property protection, concrete Placement(s), proper curing of newly placed concrete, Owner concerns, or any other items as appropriate. 2. The Engineer shall inspect and approve all repairs. 3. EXCAVATION LIMITS: The Engineer shall inspect and approve, as required, all limits of concrete removal and all steel reinforcement repairs. The engineer shall verify contractor measurements and approve or disapprove, as required, all contract chargeable quantities for all repairs. 4. APPROVAL TO PLACE CONCRETE: The Engineer shall inspect all areas prior to concrete placement and give approval, as required, for all concrete placements. The Engineer shall inspect all prep work, including forms, shoring, safety, steel bar repairs, and any adjustments to excavation limits. 5. PLACEMENT OF CONCRETE: The Engineer may inspect bag good concrete placements at their discretion. Contractor is responsible to make Engineer aware of all concrete placements at least 48 hours in advance. 6. CERTIFICATION AND TESTING: The Engineer shall be present for all certification inspections by product manufactures or installers (if any) as well as any testing, formal or informal, to exhibit proper installation of materials. 7. FINAL: The Engineer shall inspect and approve, as required, the completion of all repairs, including any correction or punch list items for each work area as appropriate. 8. The Engineer reserves the right to require additional inspections at various times throughout the project. Approvals 1. The Engineer, when satisfied with the Work, shall approve the Work in writing. 2. The Engineer shall approve or disapprove in writing, as required, specifications for all Contractor-supplied materials not specified herein at least 7 days prior to planned material use. 3. The Engineer shall determine at his sole discretion any disputes regarding reasonableness of workmanship. 751 Northlake Boulevard, Suite 2C ♦ North Palm Beach, Florida 33408 Office (561) 844-4060 ♦ Facsimile (561) 844-1001 www.struc-engineers.com The Admiral Owners Association – Concrete Repair Specifications Page 5 of 9 Contractor Responsible for Means and Methods The primary purpose of the Engineer’s visits at the site will be to provide the Owner a greater degree of confidence that the Work is being completed in accordance with requirements and specifications. On the other hand, the Engineer has no authority over nor responsibility for the Contractor’s means, methods, techniques, sequences, or procedures, so long as they do not conflict with the approved specification. The Engineer is not responsible for safety precautions and programs or for any failure of the Contractor to comply with laws, rules, or regulations. Interpretation of Requirements The Engineer shall act as initial interpreter of the requirements of the Contract Documents and judge the acceptability of the Contractor’s Work there under, making decisions in writing on all claims of Owner and Contractor relating to acceptability of the interpretation of requirements. Accordingly, the Engineer shall not be liable for the results on any such interpretations or decision rendered in good faith. CONTRACTOR’S GENERAL REQUIREMENTS Permits, Fees, and Notices 1. Except as specifically approved by the Owner in writing, the Contractor shall secure and pay for all licenses and/or permits as may be necessary for the proper execution and completion of his Work, which are applicable at the time the bids are received whether or not effective or scheduled to go into effect, and shall obtain and pay the cost of any approvals, permits, and fees that may be required by local authorities. 2. Contractor shall pay all applicable sales, consumer, and use taxes. 3. Contractor shall qualify and obtain all required permits. All Subcontractor permits are to be secured by the Contractor or Subcontractor as the Contractor may determine. 4. A copy of all required permits, licenses, certificates, and approvals shall be delivered to the Engineer and a copy shall be posted in a prominent location at the Project site prior to the commencement of the Work. 5. The Contractor shall give notices and comply with laws, ordinances, rules, regulations, and orders of public authority bearing on the performance of his Work. If the Contractor observes that the Contract Documents are at variance therewith, he shall promptly notify the Engineer in writing and necessary changes shall be adjusted by appropriate notification. If the Contractor performs any Work knowing or should have knowing it to be contrary to such laws, ordinances, rules and regulations, and without such notice to the Engineer, the Contractor shall assume full responsibility and shall bear all costs attributable thereto. 751 Northlake Boulevard, Suite 2C ♦ North Palm Beach, Florida 33408 Office (561) 844-4060 ♦ Facsimile (561) 844-1001 www.struc-engineers.com The Admiral Owners Association – Concrete Repair Specifications Page 6 of 9 CONCRETE REPAIR Repair Materials A preliminary list of material requirements for this project is shown below. Any changes to this specification shall be submitted to the Engineer for specific written approval. Approved materials must be used in accordance with manufacturer’s application guidelines. 1. New ready mix concrete materials shall meet the following minimum requirements: a. Cement content ≥ 560 lbs./yd., W/C ratio ≤ 0.40 b. Total water soluble chloride ion (Cl) content ≤ 0.05% by weight of cement c. No concrete shall be cast-in place, which is in excess of 90 minutes from the ticketed batch time. d. The Contractor shall follow the recommendations of the ACI 305R-91 “Hot Weather Concreting” when the relative humidity is less than the corresponding concrete temperatures of the intended placements. 2. New polymer modified concrete materials shall meet the following minimum requirements: Tensile bond strength, 28 days, ASTM C-882m > 4000 psi Shrinkage, 28 days, ASTM C-157 < 0.06 % Rapid chloride permeability, ASTM C-1202 < 1000 coulombs 3. Admixture Requirement – W.R. Grace corrosion-inhibitor DCI-S in the amount of 2.5 gals / C.Y. is a requirement of any design mixtures utilized in the project. 4. Additional aggregate for repair material extension shall meet ASTM C33 and certified to be non- reactive. Certification of non-reactive aggregate shall be submitted for the Engineer’s written approval prior to use. 5. New reinforcing steel shall be ASTM A615, grade 60. 6. The following Design Mix is specifically approved for use: Rinker P/C 1177769 7. The following named bag materials are specifically approved for use. The Contractor shall submit to the Engineer for review and acceptance concrete mix designs, manufacturer’s product information and manufacturer’s installation instructions for all other materials to be utilized. Approved Repair Materials Application Repair Product Comments Partial & Full Depth Slab, Beam, Columns Sikacrete 211 SCC Plus Thorough mixing with forced-action mixer is required 751 Northlake Boulevard, Suite 2C ♦ North Palm Beach, Florida 33408 Office (561) 844-4060 ♦ Facsimile (561) 844-1001 www.struc-engineers.com The Admiral Owners Association – Concrete Repair Specifications Page 7 of 9 Horizontal Repairs Sikacrete 211 SCC Plus Mix thoroughly; cure immediately after finishing Vertical / Overhead Repairs SikaQuick VOH Mix thoroughly; cure immediately after finishing Bonding Agent / Anti Corrosion Sika Armatec 110 EpoCem Add no water; apply two 10 mil coats; max open 24 hr. Epoxy Gel for Doweling Bars Sika AnchorFix-2 Ensure no air gaps Wall Cracks Sikaflex-15 LM Excellent for moving joints in vertical applications LV Epoxy for Gravity Feed or Crack Injection Sikadur 35, Hi-Mod LV Prep surface of crack thoroughly Codes & Standards Repair work under this specification shall be accomplished in compliance with the following codes, specifications and standards, except as otherwise specified: 1. ACI 301 “Specification for Structural Concrete” 2. ACI 311 “Recommended Practice for Concrete Inspection” 3. ACI 318 “Building Code Requirements for Reinforced Concrete” 4. ACI 347 “Recommended Practice for Concrete Formwork” 5. ACI 304R “Guide for Measuring, Mixing and Placing Concrete” 6. ICRI – Guideline No. 03731, “Guide for Selecting Application Methods for the Repair of Concrete Surfaces”. 7. Florida Building Code (latest edition). Concrete Testing Contractor shall retain an engineering testing laboratory at his expense to perform testing of all new ready mix (truck mix) concrete. The testing laboratory shall conform to the applicable requirements of ASTM C 1077 and shall be inspected and accredited by the Concrete and Materials Engineering Council, Inc or an equivalent national authority. The agent of the testing laboratory performing field samples shall be certified by the American Concrete Institute as a Technician Grade 1 or be equivalent or shall be a licensed professional engineer. Testing shall be performed as described hereinafter for each 10 yards of fresh concrete or fraction thereof placed at the project but for not less than one set for each day’s concrete placement. 1. Compression and Strength Tests: Each test shall consist of four (4) standard 6” x 12” cylinders, one cylinder tested at the age of 3 days, one at the age of 7 days, and 1 at the age of 28 days. The remaining cylinder shall be held in reserve. Samples for compression testing shall be secured in accordance with ASTM C 172. Specimens made to check 751 Northlake Boulevard, Suite 2C ♦ North Palm Beach, Florida 33408 Office (561) 844-4060 ♦ Facsimile (561) 844-1001 www.struc-engineers.com The Admiral Owners Association – Concrete Repair Specifications Page 8 of 9 adequacy of design strength or as a basis for acceptance of concrete shall be in accordance with ASTM C 31. Strength tests shall be in accordance with ASTM C 39. 2. Slump Tests: Tests for slump shall be made a place of deposit and in accordance with ASTM C 143. Slump shall be reported on test reports to the Engineer. Except as otherwise directed, the laboratory shall send a minimum of two copies of test reports to the Owner, Engineer and Contractor. Concrete Curing 1. All repair areas shall be covered and maintained damp by frequent spraying with water for at least 5 days or an application of BURKE “Aqua Resin” membrane curing compound or equivalent (approved by the Engineer) after finishing in accordance with the manufacturer’s instructions and recommendations. 2. All concrete shall cure a minimum of 28 days or testing show that the concrete has reached at least 80% of its design strength, prior to application of any coatings or finishes. 3. An observation shall be conducted by the Engineer prior to application of any coatings on the concrete. Any cracks in the repair areas shall be repaired in accordance with the requirements for crack repairs. Repair of cracks shall be at no additional cost to the Owner. General Concrete Repair Procedure Concrete repairs will be accomplished in accordance with International Concrete Repair Institute standards as described below. 1. Concrete repairs shall be provided for areas identified with spalling, deterioration, and unacceptable concrete. 2. Remove all loose, spalled, and unsound concrete in the area of deterioration. Areas to be repaired must be clean, sound and free of contaminants. All loose and deteriorated concrete shall be removed by mechanical means approved by the Engineer. 3. The area of concrete to be removed shall extend along the length of the reinforcing, beyond the limits of the reinforcing deterioration a minimum of 2” into sound concrete. 4. Concrete shall be removed completely around the reinforcing steel providing a minimum clearance of ¾” between reinforcing and remaining concrete. 5. Saw cut the perimeter ½” minimum perpendicular or slightly undercut to the concrete surface at the limits of the repair to prevent feathering. Do not cut any reinforcing except as accepted by the Engineer. 6. Chip concrete substrate to obtain a surface profile of 1/8” in depth with a new fractured aggregate surface. 751 Northlake Boulevard, Suite 2C ♦ North Palm Beach, Florida 33408 Office (561) 844-4060 ♦ Facsimile (561) 844-1001 www.struc-engineers.com The Admiral Owners Association – Concrete Repair Specifications Page 9 of 9 7. Occasional excess excavation performed for the Contractor’s convenience will be acceptable, but not billable. 8. Application of repair material shall not be less than ½”. 9. Remove all rust and scaling of reinforcing thoroughly by sandblasting. 10. The prepared concrete surface shall be saturated surface dry (SSD), but free of standing water. 11. Apply a coat of bonding agent as specified herein covering all exposed steel and concrete surfaces. 12. While scrub coat is still wet, place repair concrete in accordance with ACI 301 and manufacturer’s specifications. Reinforcement Replacement 1. Any questionable placement of the existing steel, as placed in the original construction, should be brought to the attention of the Engineer. 2. All reinforcing with deterioration of more than 15% of the original bar diameter, as determined by the Engineer, shall be replaced. a. NOTE: The unit cost/pricing for all concrete repairs (i.e., Partial Deck) shall include the removal of existing deteriorated steel reinforcement (if required) and the installation of NEW steel reinforcement (dowelling-in with epoxy and/or lap splicing). 3. To permit lapping of the new reinforcing steel, the concrete shall be removed along the length of the reinforcing a minimum of 40 diameters beyond the deterioration into sound concrete to permit splicing of the reinforcing. Minimum lap splice overlap area as follows: #3 bars- 15”, #4 bars- 20”, #5 bars- 25”, #6 bars- 30’ and #7 bars – 35”. 4. After the reinforcing has been prepared, lap the new reinforcing beside the entire length of the exposed reinforcing. Secure in place with the wires.