Loading...
HomeMy WebLinkAbout2020-12-10 SPECIFICATIONS FMC SOW FOR CONSTRUCTION PROJECT MANUAL FOR FMC SCOPE OF WORK Oxoboxo Lofts 42 Pink Row Uncasville, CT OWNER: Dakota Partners, Inc. 1264 Main Street Waltham, MA 02451 ARCHITECT: STRUCTURAL ENGINEER: Paul B. Bailey Architect, LLC. 110 Audubon Street New Haven, CT 06510 Phone: (203) 776-8888 Morrissey Engineering, LLC 58 Essex Street Deep River, CT. 06417 Phone: (860) 532-0312 CIVIL ENGINEER: CIVIL ENGINEER: CIVIL ENGINEER: BSC Group 300 Winding Brook Drive Glastonbury, CT 06033 Phone: (860) 652-8227 Milone & MacBroom 99 Realty Drive Cheshire, CT 06410 (203) 271-1773 Yantic River Consultants 191 Norwich Ave Lebanon, CT 06249 (860) 367-7264 December 10, 2020 FMC Scope of Work For Construction PROJECT MANUAL TABLE OF CONTENTS OXOBOXO LOFTS PAGE – 1 of 1 PROJECT MANUAL FOR FMC SCOPE OF WORK TABLE OF CONTENTS PROJECT MANUAL Title Page Project Manual Table of Contents PROJECT SPECIFICATIONS FOR PROJECT INFORMATION, GENERAL REQUIREMENTS AND ALL OTHER DIVISIONS RELATED TO FMC SCOPE OF WORK, REFER TO PREVIOUSLY ISSUED OXOBOXO LOFTS PROJECT MANUAL. THIS PROJECT MANUAL IS A SUPPLEMENT, NOT A REPLACEMENT, TO THE PREVIOUSLY ISSUED OXOBOXO LOFTS PROJECT MANUAL. DIVISION 3 CONCRETE 03370 Specialty Placed Concrete - Shotcrete SECTION 03370 SPECIALTY PLACED CONCRETE - SHOTCRETE SECTION 03370 - SPECIALTY PLACED CONCRETE - SHOTCRETE PART 1 - GENERAL 1.10 SUMMARY A. Provide Portland cement-based, micro silica modified, high strength shotcrete (dry or wet-mix) for existing vertical or overhead substrate. B. Related Sections: Other specification sections which relate directly to the work of this section include the following: 033000: Cast-In-Place concrete 1.20 SUBMITTALS A. Product Data: Submit manufacturer’s product data and installation instructions for each material and product used. Include manufacturer’s Material Safety Data Sheets. B. Design Mixes: For each shotcrete mix. 1.30 REFERENCES A. ASTM C 109: Compressive Strength B. ASTM C 42: Compressive Strength C. ASTM C 309: Standard Specification for Liquid Curing Compounds D. ASTM C 882: Slant Shear Strength E. ASTM C 78: Flexural Strength F. ASTM C 1202: Rapid Chloride Permeability Test G. ASTM C 1012: Sulfate Expansion Test H. ASTM C 1480: Standard Specification for Pre-Blended Wet or Dry Shotcrete Application I. ASTM C 1141-03: Standard Practice for Preparing and Testing Specimens for Shotcrete Test Panels J. ACI 506.2-95: Specifications for Shotcrete K. ACI CP-60 Craftsman Work Book In accordance with C660 Shotcrete Nozzlemen Certification Committee L. ACI 506.1R-98: Report on Fiber-Reinforced Shotcrete SECTION 03370 SPECIALTY PLACED CONCRETE - SHOTCRETE M. ACI 506R-90: Guide to Shotcrete 1.40 QUALITY ASSURANCE A. Shotcrete Contractor’s Required Experience: Contractor shall have a minimum of 5 years experience in shotcreting. Nozzleman certification shall be in accordance with ACI 506.3R. B. Quality Assurance/Control Testing: Test Reports prepared by a qualified independent laboratory indicating compliance with the following performance requirements: 1. ACI 301, Specifications for Structural Concrete. 2. ACI 506.2, Specification for Shotcrete. C. Testing Agency Qualifications: An independent Agency qualified according to ASTM C 1077 and ASTM E 329 for testing indicated. D. Mockups/Test Specimens: Before installing shotcrete, construct mockups for each finish required and for each design mix, shooting orientation, and nozzle operator to demonstrate aesthetic effects and set quality standard for installation. Provide one specimen by each application crew using the equipment, materials and mix proportions proposed for the Project. 1. Size: 24”x24” 2. Location: As directed by Architect. E. Concrete Testing 1. A certified testing agency will take at least (3) cores from the specimen and test them in accordance with the requirements of ASTM C42. 2. Secure and protect Test Panels during construction and test for compliance with these Specifications. 3. The average compressive strength at 7 days, of individual cylinders, must equal or exceed 0.85*f’c with no individual cylinder less than 0.75f’c. 4. Final acceptance of the shotcrete will be based on the results obtained from testing of the specimen cylinders tested strictly in accordance with the provisions of ACI 506.2. A mean test cylinders grade of 2.5 or less is acceptable. Individual shotcrete test cylinders with a grade greater than 3 or unacceptable. Use of data obtained from impact devices will not be permitted for final acceptance of the shotcrete. However, these data may be useful for determining uniformity of the shotcrete. 1.50 DELIVERY, STORAGE AND HANDLING A. Deliver products in original packaging, labeled with product identification, manufacturer, batch number and shelf life. B. Store products in a dry area. Protect from direct sunlight. Protect from freezing. SECTION 03370 SPECIALTY PLACED CONCRETE - SHOTCRETE C. Handle products in accordance with manufacturer’s printed recommendations. 1.60 PROJECT CONDITIONS A. Cold-weather shotcreting: Protect shotcrete work from physical damage or reduced strength caused by frost, freezing, or low temperatures according to ACI 306.1 and as follows: 1. Discontinue shotcreting when ambient temperature is 40 deg F and falling. Uniformly heat water and prepackaged materials before mixing to obtain a shotcrete shooting temperature of not less than 50 deg F and not more than 90 deg F. 2. Do not use frozen materials or materials containing ice or snow. 3. Do not place shotcrete on frozen surfaces or surfaces containing frozen materials. 4. Do not use calcium chloride, salt or other materials containing antifreeze agents. B. Hot-Weather Shotcreting: Mix, place and protect shotcrete according to ACI 506R when hot weather conditions and high temperatures would seriously impair quality and strength of shotcrete, and as follows: 1. Cool ingredients before mixing to maintain shotcrete temperature at time of placement below 100 deg F for dry mix or 90 deg F for wet mix. 2. Reduce temperature of reinforcing steel and receiving surfaces below 100 deg F before shotcreting. PART 2 – PRODUCTS 2.10 MATERIALS A. Portland Cement: ASTM C150, Type I or II B. Fly Ash: ASTM C618 C. Fine Aggregate: Clean, hard, durable, uncoated natural sand, free from silt, loam or clay, meeting requirements of ASTM C-33. D. Coarse Aggregate: Class II-Hard, durable, uncoated crushed limestone meeting requirements of ASM C-33. Unless otherwise noted in aggregate size 3/8” maximum, No. 5, 56 or 57. E. Water: Fresh, clean, potable, and free of deleterious acids, mixing, and curing water. F. Admixtures: Use only accepted admixtures meeting the following requirements: 1. Chemical Admixtures: ASTM C494 2. Water reducing, retarding or accelerating admixtures shall conform to ASTMC. SECTION 03370 SPECIALTY PLACED CONCRETE - SHOTCRETE 3. Air-entraining Admixtures: ASTM C1141. Air entrainment prior to shooting shall be no greater than 1.5%-3%. The use of air-entraining admixtures in dry-mix shotcrete is not recommended. 4. The use of Calcium Chloride shall not be permitted. The Contractor shall submit details of proposed admixtures with concrete mix design. G. Forms: Form facing panels that will provide continuous, straight, smooth, concrete surfaces. Furnish panels in largest practicable sizes to minimize number of joints. H. Reinforcing Materials 1. Plain-Steel-Welded Wire Fabric: ASTM A 185, fabricated from galvanized steel wire into flat sheets 2. Supports: Bolsters, chairs, spacers, ties and other devices for spacing, supporting, and fastening reinforcing steel in place according to CRSI’s “Manual of Standard Practice” and as follows: a. For uncoated reinforcement, use all-plastic bar supports b. For zinc-coated reinforcement, use galvanized wire or dielectric-polymer coated wire all-plastic bar supports. I. Accessory Materials A. Water: clean and free from deleterious acids, alkalis, and organic matter. B. Ground Wire: High-strength steel wire, 0.8 to 1 mm in diameter. C. Joint Filler Strips: ASTM D 1751, asphalt-saturated cellulose fiber or ASTM D 1752, cork or self-expanding cork J. Curing Materials A. Absorptive Cover: AASHTO M 182, Class 2, burlap cloth made from jute or kenaf, weighing approximately 9 0z/sq. yd. Dry. B. Moisture-Retaining Cover: ASTM C 171, polyethylene film or white burlap- polyethylene sheet. C. Water: Clean and free from deleterious acids, alkalis, and organic matter. 2.20 PROPORTIONS AND MIXING: A. Proportions and design in accordance with approved mix design. 2.30 CONCRETE APPLICATION EQUIPMENT: A. Mixing Equipment: Capable of thoroughly mixing shotcrete materials in sufficient quantities to maintain continuous placement. SECTION 03370 SPECIALTY PLACED CONCRETE - SHOTCRETE B. Dry-Mix Delivery Equipment: Capable of discharging aggregate-cement mixture into delivery hose under close control and maintaining continuous stream of uniformly mixed materials at required velocity to discharge nozzle. Equip discharge nozzle with manually operated water-injection system for directing even distribution of water to aggregate- cement mixture. 1. Provide uniform, steady supply of clean, compressed air to maintain constant nozzle velocity while simultaneously operation blow pipe for cleaning away rebound. 2. Provide water supply with uniform pressure at discharge nozzle to ensure uniform mixing with aggregate-cement mix. Provide water pump to system if line water pressure is inadequate. C. Wet-Mix Delivery Equipment: Capable of discharging aggregate-cement-water mixture accurately, uniformly, and continuously. PART 3 – EXECUTION 3.10 EXAMINATION A. Examine substrates and conditions under which materials will be installed. Do not proceed with installation until unsatisfactory conditions are corrected. B. Coordinate installation with adjacent work to ensure proper sequence on construction. Protect adjacent areas and landscaping from contact due to mixing and handling of materials. 3.20 SURFACE PREPARATION: A. Remove loose and deteriorated materials from surfaces to be patched, using mechanical chipping, sand-blasting, or high pressure water blasting B. Comply with surface preparation requirements of ACI 506.2, “Specification for Materials, proportioning and application of Shotcrete”. C. Moisten substrate immediately before placing shotcrete. 3.30 STEEL REINFORCEMENT A. General: Comply with CRSI’s “Manual of Standard Practice” for fabricating, placing and supporting reinforcement. B. Clean reinforcement of loose rust and mill scale and other materials that weaken shotcrete bonding. C. Accurately position, support and rigidly secure reinforcement against displacement by form work, construction or shotcreting. Locate and support reinforcement by metal chairs, runners, bolsters, spacers and hangers, as required. Maintain minimum cover. SECTION 03370 SPECIALTY PLACED CONCRETE - SHOTCRETE D. Install welded wire fabric in lengths as long as practicable. Lap adjoining pieces at least one full mesh and lace splices with wire. Offset laps of adjoining widths to prevent continuous laps in either direction. 3.40 JOINTS A. Construction Joints: Locate and install construction joints tapered to a 1:1 slope where joint is not subject to compression loads and square where joint is perpendicular to main reinforcement. Continue reinforcement through construction joints, unless otherwise indicated. B. Contraction Joints: Construct contraction joints in shotcrete using saw cuts 1/8-inch wide by 1/3 slab depth or joint-filler strips 1/4-inch wide by 1/3 shotcrete depth, unless otherwise indicated. 1. After shotcrete has cured, remove strip inserts and clean groove of loose debris. 2. Space joints at 9” o/c, horizontally and vertically. 3. Tool edges round on each side of strip inserts of floated or troweled finishes are required. 3.50 ALIGNMENT CONTROL A. Ground wires: Install ground wires to establish thickness and planes of shotcrete surfaces. Install ground wires at corners and offsets not established by forms. Pull ground wires taut and position adjustment devices to permit additional tightening. 3.30 BATCHING AND MIXING: A. Proportions: Mix proportions shall be controlled by weight batching. The Contractor’s Testing Laboratory shall maintain quality control records during shotcrete production and make those records available to the Client. 3.40 APPLICATION: A. Place shotcrete material by dry or wet shotcrete application, using suitable delivery equipment and procedures that will result in shotcrete in place meeting the requirements of this Specification. B. Control thickness, method of support, air pressure, and/or water content of shotcrete to preclude sagging or sloughing off. C. Apply dry-mix shotcrete materials within 45 minutes after pre-dampening and wet-mix shotcrete materials within 90 minutes after batching. D. Shotcrete nozzle must be held at 90° angle to the substrate surface. E. Move nozzle in a circular motion to achieve proper consolidation and reduced rebound. Deposit shotcrete continuously in multiple passes, to required thickness, without cold joints and laminations developing. F. In shotcreting walls, begin application at bottom. Ensure work does not sag. SECTION 03370 SPECIALTY PLACED CONCRETE - SHOTCRETE G. Installation Tolerances: Place shotcrete without exceeding installation tolerances permitted by ACI 117R, increased by a factor of 2. 3.5 SURFACES FINISHES: A. General: Finish shotcrete according to descriptions in ACI 506R for the following finishes: B. Natural Finish: 1. Rod Finish: Rough textured finish obtained by cutting or screeding exposed face of shotcrete to plane by rod or straight edge after initial set and steel-troweled finished. 3.60 CURING: A. Moist cure or use a membrane-forming curing compound complying with ASTM C 309 as recommended in ACI 506.2R. 3.70 CRACKING & REPAIRS A. Cracking from inadequate curing is not allowed. Sawcut joints and construction joints as required to prevent cracking. B. The contractor shall repair all cracks and displacements larger than 1/16”. C. Remove and replace shotcrete that is delaminated ore xhibits laminations, voids or sand/rock pockets exceeding limits for specified core grade of shotcrete. 1. Remove unsound or loose materials and contaminants that may inhibit bond of shotcrete repairs. Chip or scarify areas to be repaired to extent necessary to provide sound substrate. Cut edges square and ½ inch deep at perimeter of work, tapering remaining shoulder at 1:1 slope into cavity to eliminate square shoulders. Dampen surfaces and apply new shotcrete. 3.60 CLEANING: A. Remove excess material before material cures. If material has cured, remove using mechanical methods that will not damage substrate. END OF SECTION