Pattern Imprinted Concrete
** NOTE TO SPECIFIER ** Bomanite Corporation; Colored, textured and imprinted concrete techniques and concrete enhancements..
SECTION 03300 - CAST-IN-PLACE CONCRETE, Copyright 2006, ARCAT, Inc.
PART 1 GENERAL
1.1 SECTION INCLUDES
** NOTE TO SPECIFIER ** Delete items below not required for project.
- Integrally colored Portland cement concrete paving with imprinted pattern, stain and cure/sealer.
- Integrally colored and color-hardened Portland cement concrete paving with imprinted pattern and stain/sealer treatments.
1.2 RELATED SECTIONS
** NOTE TO SPECIFIER ** Delete any sections below not relevant to this project; add others as required.
- Section 02300 ‑ Earthwork: Preparation of site for paving.
- Section 02740 ‑ Asphaltic Concrete Paving: Asphaltic paving.
- Section 02765 ‑ Pavement Marking: Pavement marking.
- Section 07920 ‑ Joint Sealants: Sealant for joints.
** NOTE TO SPECIFIER ** Delete references from the list below that are not actually required by the text of the edited section.
- ACI 301 - Specifications for Structural Concrete for Buildings.
- ACI 302 - Guide for Concrete Floor and Slab Construction.
- ACI 303 - Guide to Cast-in-Place Architectural Concrete Practice.
- ACI 305R - Hot Weather Concreting.
- ACI 306R - Cold Weather Concreting.
- ACI 308 - Standard Practice for Curing Concrete.
- ACI 309 - Standard Practice for Consolidation of Concrete.
- ACI 347 - Guide to Formwork for Concrete.
- ACI 503 - Standard Specification for Bonding Plastic Concrete to Hardened Concrete with a Multi-Component Epoxy Adhesive.
- ASTM C33 - Standard Specifications for Concrete Aggregates.
- ASTM C150 - Standard Specifications for Portland Cement.
- ASTM C260 - Standard Specifications for Air-Entraining Admixtures for Concrete.
- ASTM C309 - Standard Specifications for Liquid Membrane Forming Compounds for Curing Concrete.
- ASTM C494 - Standard Specifications for Chemical Admixtures for Concrete.
- ASTM C618 - Standard Specifications for Fly Ash and Raw or Calcined Natural Pozzolan for Use as a Mineral Admixture in Portland Cement Concrete.
- ASTM C881 - Standard Specifications for Epoxy-Resin-Base Bonding Systems for Concrete.
- ASTM A185 - Standard Specification for Steel Welded Wire Reinforcement, Plain, for Concrete.
- ASTM A615 - Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement.
- ASTM C94 - Standard Specification for Ready-Mixed Concrete.
- ASTM C206 - Standard Specification for Finishing Hydrated Lime.
- ASTM C233 - Standard Test Method for Air-Entraining Admixtures for Concrete.
- ASTM C920 - Standard Specification for Elastomeric Joint Sealants.
- ASTM C979 - Standard Specification for Pigments for Integrally Colored Concrete.
- ASTM C1059 - Standard Specification for Latex Agents for Bonding Fresh To Hardened Concrete.
- ASTM C1077 - Standard Practice for Laboratories Testing Concrete and Concrete Aggregates for Use in Construction and Criteria for Laboratory Evaluation.
- ASTM D1751 - Standard Specification for Preformed Expansion Joint Filler for Concrete Paving and Structural Construction (Nonextruding and Resilient Bituminous Types).
- ASTM D1752 - Standard Specification for Preformed Sponge Rubber and Cork Expansion Joint Fillers for Concrete Paving and Structural Construction.
- ASTM E329 - Standard Specification for Agencies Engaged in the Testing and/or Inspection of Materials Used in Construction.
- ASTM E548 - Standard Guide for General Criteria Used for Evaluating Laboratory Competence.
- Submit under provisions of Section 01300.
- Product Data: Manufacturer's data sheets on each product to be used, including:
- Preparation instructions and recommendations.
- Storage and handling requirements and recommendations.
- Installation methods.
- Perform testing and analysis under provisions of Section 01400.
- Submit proposed mix design for each class of concrete for review prior to commencement of work.
- Testing firm will take cylinders and perform slump and air entrainment tests in accordance with ACI 301.
- Four concrete test cylinders will be taken for each class of concrete placed each day.
- One slump test will be taken for each set of test cylinders taken.
1.5 QUALITY ASSURANCE
** NOTE TO SPECIFIER ** Add quality statements for the manufacturer. Delete if not required.
- Manufacturer Qualifications:
- Installer Qualifications:
- The Installer shall provide a qualified foreman or supervisor who has a minimum of three years experience with imprinted and textured concrete, and who has successfully completed at least five Bomanite imprinted concrete installations of high quality and similar in scope to that required.
- The concrete is cast in place, on the job site, by trained and experienced workmen who shall be employed by a firm that is a licensed and certified Bomanite Imprint Licensed Contractor
- Perform work in accordance with ACI 301, 302, 303.
- Obtain materials from same source throughout.
- Conform to applicable codes and regulations for paving work performed within the public right of way.
- Ready-Mixed Supplier Qualifications: Supplier of ready-mixed concrete products shall comply with ASTM C 94 requirements for production facilities and equipment. Supplier shall be certified according to NCRMA’s “Certification of Ready Mixed Concrete Production Facilities Quality Control Manuals.”
- Testing Agency Qualifications: An independent testing agency, acceptable to authorities having jurisdiction, qualified according to ASTM C 1077 and ASTM E 329 to conduct the testing indicated, as documented according to ASTM E 548.
** NOTE TO SPECIFIER ** Include a mock-up if the project size and/or quality warrant taking such a precaution. The following is one example of how a mock-up on a large project might be specified. When deciding on the extent of the mock-up, consider all the major different types of work on the project.
- Mock-Up: Provide field samples of surface colors textures and patterns specified for architect approval prior to beginning work, 48 inches by 48 inches (1219 mm by 1219 mm) in size illustrating paving finishes.
- Finish areas designated by Architect.
- Do not proceed with remaining work until workmanship, color, and sheen are approved by Architect.
- Refinish mock-up area as required to produce acceptable work.
1.6 DELIVERY, STORAGE, AND HANDLING
- Store products in manufacturer's unopened packaging until ready for installation.
- Store and dispose of solvent-based materials, and materials used with solvent-based materials, in accordance with requirements of local authorities having jurisdiction.
1.7 PROJECT CONDITIONS
- Do not place pavement when base surface or ambient temperature is less than 40 degrees F (4 degrees C) or if base surface is wet or frozen.
- Maintain environmental conditions (temperature, humidity, and ventilation) within limits recommended by manufacturer for optimum results. Do not install products under environmental conditions outside manufacturer's absolute limits.
- All materials manufactured by The Bomanite Company are warranted to be of uniform quality within manufacturing tolerances.
** NOTE TO SPECIFIER ** Please contact your local Bomanite contractor for available warranties on workmanship. Bomanite Corporation makes no warranty, expressed or implied, as to the quality of the workmanship by local Bomanite contractors.
- Since control is not exercised over their use, no warranty, expressed or implied, is made as to the effects of such use. The Bomanite Company's obligation under this warranty shall be limited to refunding the purchase price of that portion of the material proven to be defective.
PART 2 PRODUCTS
** NOTE TO SPECIFIER ** Delete one of the following two paragraphs; coordinate with requirements of Division 1 section on product options and substitutions.
- Substitutions: Not permitted.
- Requests for substitutions will be considered in accordance with provisions of Section 01600.
- Supporting Structure:
- Mix Design:
- Mix and deliver concrete in accordance with ASTM C94, Alternate 2. Refer to Drawings for concrete strength requirements.
** NOTE TO SPECIFIER ** Delete requirements not required.
- Use accelerating admixtures containing no calcium chloride in cold weather only when approved by testing laboratory. Use of admixtures will not relax cold weather placement requirements.
- Use set retarding admixtures during hot weather only when approved by testing laboratory.
- Add air entraining agent to concrete mix for concrete work exposed to exterior, in amounts of 4 to 7 percent of total concrete volume or as otherwise recommended by testing laboratory.
- Add coloring admixture where scheduled in quantities recommended by coloring admixture manufacturer to achieve selected color.
- Add polypropylene fiber reinforcement at point of concrete batching at rate scheduled.
- Maintain water cement ratio to produce a minimum of 3 to maximum of 5 inch slump.
- Use of calcium chloride is strictly prohibited.
** NOTE TO SPECIFIER ** Insert subgrade preparation requirements if no drawings or earthwork section.
- Refer to Section 02300 for subgrade preparation.
- Refer to drawings for scope of subgrade preparation.
** NOTE TO SPECIFIER ** Delete reinforcing not required.
- Fiber Reinforcement: ASTM C948, collated, fibrillated, 3/4 inch (19 mm) long virgin polypropylene fibers, equal to BOMANITE Fibers by The Bomanite Company.
- Reinforcing Steel: ASTM A615; Grade 60; deformed billet steel bars, uncoated finish.
- Welded Steel Wire Fabric: Plain type, ANSI/ASTM A185; in flat sheets; uncoated finish.
** NOTE TO SPECIFIER ** Always required - select one or both.
- Integral Color:
** NOTE TO SPECIFIER ** Admixtures improve desired properties of concrete mix. Do not use admixtures which permit cold weather concreting that is detrimental to concrete properties and do not use super-plasticizers without prior experience. Consult with Bomanite Corporation for assistance in selecting type "D" as there are various levels of retarding mixtures available. Delete type not required.
- Integral Coloring Admixture: Integral Color by The Bomanite Company, synthetic oxide pigment, meeting ASTM C979 and C494.
- Type A, cement dispersing/water reducing.
- Type D, set retarding/water reducing.
- Color to match Architect's sample.
** NOTE TO SPECIFIER ** Bomanite Color Hardener is a colored dry powder, used to color the concrete surface while promoting increased concrete abrasion resistance and color steadfastness. Delete if not required.
- Color Hardener:
- Bomanite Color Hardener: The concrete shall be colored with Bomanite Color Hardener. Color(s) as scheduled. Refer to Drawings.
- Tools Selection:
- Imprinting Tools:
- Mat type imprinting tools for texturing freshly placed concrete, in pattern/texture as selected by Architect or as scheduled.
- Imprinting tools used in the execution of this project shall be manufactured by The Bomanite Company.
** NOTE TO SPECIFIER ** Always required - select one.
- Bomanite Patterns: Design(s) as scheduled. Refer to Drawings.
- Bomacron Textures and Patterns: Design(s) as scheduled. Refer to Drawings.
** NOTE TO SPECIFIER ** Required only when selecting Bomacron Patterns. Delete if not required.
- Release Agent Selection:
** NOTE TO SPECIFIER ** Required - Select One.
- Powdered Release Agent. Color(s) as scheduled. Refer to Drawings.
** NOTE TO SPECIFIER ** Bomanite Release Agent is a colored dry powder, used to facilitate release of the imprinting tools from concrete surface, and to provide moderate color variations to the textured surface. Delete if not required.
- Bomanite Release Agent.
- Liquid Release Agent. Clear color.
** NOTE TO SPECIFIER ** Bomanite Liquid Release is a clear, non-pigmented solvent with a pleasant bubble gum scent. Bomanite Liquid Release is used for releasing Bomacron imprinting tools from the concrete surfaces and Bomanite Thin-Set, while at the same time serving as an alternative to Bomanite Release Agent when pigmented powders are prohibitive. Bomanite Liquid Release can be utilized for both interior and exterior applications, providing a fast-track imprinting option. Bomanite Liquid Release will not leave a residue on the imprinted surface and can be used in conjunction with Bomanite Chemical Stain, Bomanite Con-Color and Bomanite Topical Stain. Delete if not required.
- Bomanite Liquid Release.
** NOTE TO SPECIFIER ** Optional - select one or delete if not required.
- Secondary Antique or Coloration:
- Topical Stain: Color(s) as scheduled. Refer to Drawings.
** NOTE TO SPECIFIER ** Bomanite Topical Stain is a pigmented liquid used to provide secondary coloration to the Bomacron surface. Delete if not required.
- Bomanite Topical Stain.
- Chemical Stain: Color(s) as scheduled. Refer to Drawings.
** NOTE TO SPECIFIER ** Bomanite Chemical Stains are water and acid based solutions of metallic salts formulated to “color etch” new or existing concrete surfaces. These penetrating solutions react with cements to form permanent, insoluble precipitants of varying colors. Bomanite Chemical Stains are intended for use on horizontal concrete and other masonry mediums. Bomanite Chemical Stains produce a mottling of color tones that are directly affected by the substrate color and porosity. Variations and inconsistencies in color are expected and are usually the reason for using this coloring technique. Delete if not required.
- Bomanite Chemical Stain.
** NOTE TO SPECIFIER ** Optional - select one or delete if not required.
- Cure Agent:
** NOTE TO SPECIFIER ** Only chose if installing Bomanite Patterns. Delete if not required.
- Membrane Color Cure: Color(s) as scheduled. Refer to Drawings.
** NOTE TO SPECIFIER ** Select 1 below for color coordinated curing on concrete that will be regularly maintained and recoated; select 2 below for concrete which will be allowed to weather naturally; 3 below is the same as 2, but is a lower gloss version. Contact manufacturer for suggested maintenance coatings for periodic renewal of finish. Delete curing compound not required.
- Curing Compound: Meeting ASTM C309, water based emulsion.
- BOMANITE Color Cure by The Bomanite Company.
- BOMANITE Clear Cure by The Bomanite Company.
- BOMANITE Clear Cure Matte Finish by The Bomanite Company.
** NOTE TO SPECIFIER ** Only chose if installing Bomacron Patterns. Delete if not required.
- Silicate Cure & Densifier:
** NOTE TO SPECIFIER ** Bomanite Con-Shield will help prevent deterioration and spalling from deicing salts used in freeze/thaw conditions. Bomanite Con-Shield will also increase the abrasion resistance of finished Bomacron surface. Delete if not required.
- The concrete shall receive a cure treatment utilizing Bomanite Con Shield.
** NOTE TO SPECIFIER ** Sealer selection. Delete two of the following three paragraphs. Always retain one.
- Sealing and Finish Coatings:
** NOTE TO SPECIFIER ** BOMANITE Colorwax: Water based, wax-modified, acrylic formula coating works as both a curing membrane and as a long-lasting, durable and decorative finish to colored concrete. Is formulated to match color of concrete. For use with Bomanite Pattern Concrete only. Delete if not required.
- Colorwax by The Bomanite Company.
** NOTE TO SPECIFIER ** Bomanite HydroLock is a water-based, single component, epoxy-modified, penetrating sealer. It is VOC, EPA, OSHA and FDA compliant. The product is non-hazardous and has the consistency of water. It is milky white in appearance when applied, and dries crystal clear creating a finish that ranges from a satin sheen to a semi-gloss depending on the surface. It performs well inside and outside on both new and old surfaces. Bomanite HydroLock is appropriate for cast-in-place concrete as well as decorative stamped and patterned concrete that has been colored using various coloring systems like integral, acid-stained, release agents and color hardeners. It will also perform well on concrete and clay pavers, natural stone, porous tiles and Terrazzo. Delete if not required.
- Hydrolock by The Bomanite Company.
** NOTE TO SPECIFIER ** Bomanite VOC II uses a VOC-exempt solvent, making it legal in anywhere in California. Delete if not required.
- VOC II by The Bomanite Company.
2.3 RELATED MATERIALS
- Cement: ASTM C150, type 1, Portland cement, gray color.
- Fine and Coarse Aggregates: ASTM C33.
- Water: Clean and not detrimental to concrete.
- Form Material: Conform to ACI 301. If using metal, material shall be free from deformities. If using wood, use construction grade lumber, sound and free of warp, minimum 2 inches (51 mm) nominal thickness, except where short radii of curves require thinner forms.
- Contraction Joint Devices: Galvanized sheet metal, keyed profile, with knock‑outs for reinforcing and dowel steel.
- Tie Wire: Annealed steel, minimum 16 gage (1.519 mm) size.
- Dowels: ASTM A615; Grade 40, plain steel, uncoated finish.
- Miscellaneous Reinforcing Accessories: Spacers, chairs, ties, and other devices necessary for properly placing, spacing, supporting, and fastening reinforcement in place.
- Form release agent: As acceptable to concrete colorant manufacturer, non-staining, dissipative type.
- Vapor Retarding Membrane: 10 mil (.2540 mm) reinforced polyethylene.
- Air-Entraining Admixture: ASTM C 206. Air Entrained Concrete shall be used wherever concrete is exposed to the freezing weather. Proportions of entrained air, as determined by ASTM C233, and C260, shall be as follows:
** NOTE TO SPECIFIER ** Delete one of the two following paragraphs.
- Aggregate: 3/8 inch (9.5 mm) maximum size aggregate 6-8 percent entrained air.
- Aggregate: 3/4 inch (19 mm) maximum size aggregate 5-7 percent entrained air.
** NOTE TO SPECIFIER ** Select one or more of the following joint fillers. "1" is used where an architectural statement needs to be made. "2" is more utilitarian. "3" is used as backing for joint filler for sealant specified in Section 07920.
- Joint Fillers:
- Redwood Boards: Construction heart grade redwood, sound and free of checks, splits or other defects, 3/4 inch (19 mm) thick.
- Asphaltic Joint Filler: Asphalt impregnated fiberboard, ASTM D1751, 1/2 inch (12 mm) thick.
- Non‑Asphaltic Joint Fillers: ASTM D1752, Type I.
** NOTE TO SPECIFIER ** Select 1 for applications where puncture resistance of horizontal joints is not a requirement. Select 2 for areas where a shore A modulus of 40 is desirable for horizontal joints subject to frequent foot traffic.
- Sealants: Two part polyurethane sealants, of grade as required to suit application, meeting ASTM C920, in manufacturer's custom colors.
- Urethane, SL grade, as specified in Section 07920.
- Urethane, SL-TB grade as specified in Section 07920.
** NOTE TO SPECIFIER ** Delete if not required.
- Bonding-Agent: ASTM C 1059, Type II, non-redispersible, acrylic emulsion or styrene butadiene rubber.
** NOTE TO SPECIFIER ** Delete if not required.
- Epoxy-Bonding Adhesive: ASTM C 881, two component epoxy resin, capable of humid curing and bonding to damp surface, of class and grade to suit requirements if required, and as follows: Types I and II, non-load bearing, for bonding hardened of freshly mixed concrete to hardened concrete.
PART 3 EXECUTION
- Verify compacted subgrade is ready to support paving and imposed loads, free of frost, smooth and properly compacted.
- Verify gradients and elevations of base are correct, and proper drainage has been provided so water does not stand in the area to receive paving.
- Beginning of installation means acceptance of existing conditions.
- If vapor retarding membrane is not used, moisten base to minimize absorption of water from fresh concrete.
- Notify Architect and testing laboratory, minimum 24 hours prior to commencement of concreting operations.
- Construct and remove forms in accordance with ACI 347.
- Place and secure forms to correct location, dimension, and profile. Adequately brace to withstand loads applied during concrete placement.
- Assemble formwork to permit easy stripping and dismantling without damaging concrete.
- Place joint fillers vertical in position, in straight lines. Secure to formwork during concrete placement.
3.4 INSERTS AND ACCESSORIES
- Make provisions for installation of inserts, accessories, anchors, and sleeves.
** NOTE TO SPECIFIER ** Vapor retarders are useful in exterior paving applications, especially where slip resistance is important (as in tennis courts) and where surface condensation during certain climatic conditions are undesirable. Delete if not required.
- Place vapor retarder continuously over subgrade. Overlap joints a minimum of 12 inches (305 mm) and seal with a joint tape of same permeance as sheeting material.
- Accurately place reinforcement in middle of slabs‑on‑grade.
- Discontinue every other bar of reinforcement at control and expansion joints.
- Place reinforcement to achieve slab and curb alignment as detailed.
- Steel shall be free of rust, mill scale, dirt and oil.
- Provide doweled joints at interruptions of concrete with one end of dowel set in capped sleeve to allow longitudinal movement. Provide support at both ends of dowels.
- Support reinforcing on bar chairs. Securely saddle tie at intersections. Rigidly secure in place to minimize displacement during concrete pour.
- Intentional stoppage of concrete placing shall be at planned location of either an expansion joint or contraction joint.
- When stoppage occurs at an expansion joint, install joint assembly with a bulkhead of sufficient section drilled to accommodate required dowels. Provide expansion joints at maximum 40 feet (12 m) o.c.e.w. in parking lots, 40 feet (12 m) o.c. for curbs and maximum 20 feet (6 m) o.c.e.w. at pedestrian paving.
- When stoppage occurs at a contraction joint, install sheet metal joint assembly of sufficient section to prevent deflection, shaped to concrete section. Drill bulkhead to permit continuation of longitudinal reinforcing steel through construction joint.
- Stoppage at Unintentional Location:
- Immediately upon unintended stoppage of concrete placing, place available concrete to a line and install bulkhead perpendicular to surface of pavement and at required elevation. Place and finish concrete to this bulkhead. Remove and dispose of concrete remaining on subgrade ahead of bulkhead.
- When placing of concrete is resumed before concrete has set to extent that concrete will stand on removal of bulkhead, new concrete shall be rodded with the first; otherwise, carefully preserve joint face.
- Provide a joint seal space at edges created by a construction joint of this type shall have a joint seal space as detailed on Drawings.
- Provide sawed contraction joints in vehicular paving and curbs spaced as detailed on Drawings, but in no case greater than 20 feet (6 m) o.c. spacing.
- Saw joints after completion of finishing operations as soon as concrete has hardened to extent necessary to prevent revealing of joint or damage to adjacent concrete surfaces.
- Saw joints same day that concrete is placed except that sawing of joints in concrete placed late in day may be delayed until morning of following day.
- In any event, saw joints within 18 hours after placing concrete.
- Use a power‑driven concrete saw made especially for sawing concrete and maintain in good operating condition.
- Saw cut shall be to a depth equal to 1/4 of slab thickness, minimum one inch (25 mm) depth.
- Align joints in vehicular paving with joints in adjacent pedestrian paving.
- Cut joints through curbs at right angles to back of curb.
- Place joint filler between paving components and building or other appurtenances.
- Provide scored joints in sidewalks and plazas to a depth of 1/4 the slab thickness, and at intervals as indicated, but in no case spaced greater than width of walk.
3.7 PLACING CONCRETE
- Place concrete in accordance with ACI 301, 302, and 304. Deposit concrete so that specified slab thickness will be obtained after vibrating and finishing operations. Minimize handling to prevent segregation. Consolidate concrete by suitable means to prevent formation of voids or honeycombs. Exercise care to prevent disturbance of forms and reinforcing and damage to vapor retarder. Place concrete to lines and levels shown, properly sloped to drain as designed.
- Hot Weather Placement: ACI 305.
- Cold Weather Placement: ACI 306.
- Ensure reinforcement, inserts, embedded parts, and formed joints are not disturbed during concrete placement.
- Place concrete continuously between predetermined construction joints. Do not break or interrupt successive pours such that cold joints occur.
- After consolidating and screeding, float concrete to gradients indicated. Use a straight edge to level and test surface in longitudinal direction to required grade. Finish edges to provide a smooth dense surface with 1/8 inch (3 mm) radius.
** NOTE TO SPECIFIER ** Apply color hardener. Delete if not required.
- Apply Bomanite Color Hardener prior to application of pattern. Apply at rate recommended by manufacturer, evenly to the surface of the fresh concrete by the dry-shake method. Applied in two or more shakes, floated after each shake and troweled only after the final floating.
- While concrete is still in its plastic state, apply the tool/texture pattern to the surface of the concrete. Properly tamp tools into the surface to achieve the required texture, with uniformity of pattern and depth of stamping. Utilize bond breaker to keep tools from sticking to fresh concrete.
- Release material shall be applied to the troweled surface prior to imprinting.
** NOTE TO SPECIFIER ** Apply curing compound. Delete if not required.
- Place curing compound on exposed concrete surfaces immediately after finishing. Apply in accordance with manufacturer's instructions.
** NOTE TO SPECIFIER ** Delete if not required.
- Apply secondary stain treatment per approved mock-up or as scheduled to achieve design.
** NOTE TO SPECIFIER ** Always retain the following paragraph.
- Apply finish sealer per approved mock-up or as specified to achieve design required.
3.8 FIELD QUALITY CONTROL
- Field inspection and testing will be performed under provisions of Section 01400.
- Maintain records of placed concrete items. Record date, location of pour, quantity, air temperature, and test samples taken.
- Immediately after placement, protect concrete under provisions of Section 01500 from premature drying, excessive hot or cold temperatures, and mechanical injury.
END OF SECTION