PERVIOUS CONCRETE Guideline Specifications
PART 1 - GENERAL
1.1 RELATED DOCUMENTS
A.Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this section.
1.2 SUMMARY
A.Work specified in this section includes all labor, materials, equipment and services necessary to complete the installation of Bomanite Pervious Concrete.
B.Related Sections include the following:
1. Division 1 Section “Product Requirements” for submittals and
substitutions.
1.3DEFINITIONS
1.4SUBMITTALS
A. Product Requirements:
1. Provide submittal information within 35 calendar days after the contractor has received the owner's notice to proceed.
B. Product Data:
1. Submit special concrete finishes manufacturer’s specifications, test data and other data required for each type of manufactured material and product indicated.
2. Submit special concrete finishes technical bulletins listing manufacturer’s name, product name, descriptive data, curing time and application requirements.
3. Submit special concrete finishes manufacturer’s Material Safety Data Sheet (MSDS) and other safety requirements.
C.Material Certificates:
D.Field quality-control test and inspection reports.
1.Documentation by the concrete contractor or General Contractor of the sub-grade compaction results prior to concrete placement.
1.5QUALITY ASSURANCE
A.Installer Qualifications: The contractor for this work shall be a Bomanite Ecocrete Licensed Contractor and Certified Applicator approved by Bomanite International Limited001 (303) 526 8894
1.Provide letter of certification from Bomanite International Limited stating that installer is a certified applicator of special concrete finishes and is familiar with proper procedures/installation requirements of the manufacturer.
2.Use an authorized Bomanite EcoCrete Licensed Contractor and adequate number of skilled workmen who are thoroughly trained and experienced in the necessary craft.
3.Applicator shall be familiar with the specified requirements and the methods needed for proper performance of work of this section.
4.Applicator shall be familiar with the previously approved mock-ups that demonstrated standard of workmanship.
5.Authorized installers limited to the following:
a.XXXXX
B.Manufacturer Qualifications: A firm experienced in the support and training of a national installer network and manufacturing products required/listed to complete the work.
C.Source Limitations: Obtain each type or class of cementitious material of the same brand from same manufacturer’s plant, obtain aggregate from one source, and obtain admixtures through one source from a single manufacturer.
D.Mock-ups:
1.Apply finish to mock-ups constructed by concrete contractor, using each type of finish to demonstrate finished appearance and standard of workmanship.
a.Mock-up shall include entire system, including sub-base, geotechnical fabric (if required), integral color, topical color (if required), and surface hardeners and sealers.
b.Notify Architect seven days in advance of dates and time when mockups will be constructed.
c.Obtain from Architect approval of mock-ups before starting construction.
d.If the Architect determines that the mock-ups do not meet requirements, General Contractor will demolish and remove them from the site and arrange to assemble more until approved.
e.Maintain mock-ups during construction in an undisturbed condition as a standard for judging the completed work.
1.6DELIVERY, STORAGE AND HANDLING
A. Deliver materials in original packages and containers, with seals unbroken, bearing manufacturer labels indicating brand name and directions for storage, mixing with other components and application.
B. Store materials to comply with manufacturer’s written instructions.
C. Dispense special concrete finish material from factory numbered and sealed containers. Maintain record of container numbers.
1.7PROJECT CONDITIONS
A. Environmental Limitations:
1.Comply with manufacturer’s written instructions for ambient temperature and other conditions affecting installation performance.
2. Concrete must be cured a minimum of 14 days or as directed by the manufacturer before trafficking of Bomanite Pervious Concrete can begin.
PART 2 - PRODUCTS
2.1 MANUFACTURERS
A.In other Part 2 articles where titles below introduce products, the following requirements apply to product selection:
1.Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into the Work include, but are not limited to, manufacturer listed. For other manufacturers to be considered, submit according to the specifications in “Product Requirements.”
Bomanite International Limited
001 303 526 8894
2.2 PERFORMANCE REQUIREMENTS
- The product is required to bear daily vehicular traffic in excess of 30,000 pounds traveling at speeds greater than 20 miles per hour.
- The product is required to be manufactured from cast-in-place concrete with a minimum thickness of 6”.
2.3MATERIALS
A.Bomanite Coloration Concentrate: Concentrated dry powder iron oxide pigments designed to color concrete (optional – dependent upon Pervious System Selected)
1.Colors based of Bomanite Integral Color Chart or Systems Color Chart
B.Bomanite Con Color
C.Bomanite C - 18
D.No substitutions or alternates to the above will be accepted.
E.Concrete Mix Design: Contractor shall furnish test results proving that mix design meets ASTM C29 paragraph 11 Standard, Mix Design shall have a 20% void structure for low porosity, high strength pervious or 30% void structure for high porosity, low strength concrete. A 5%+- void structure is acceptable.
F.Cement: Portland Cement Type 1 or II conforming to ASTM C 150
G.Fly Ash and Ground Iron Blast-Furnace Slag: Fly ash conforming to ASTM C 618 may be used in amounts not to exceed 20% of total cementitious material. Ground Iron Blast – Furnace Slag conforming to ASTM C 989 may be used in amounts not to exceed 50% by weight of total cementitious material. (Note when pozzolanic material is incorporated into concrete high early strength is sacrificed for higher long term strength. Additional curing may be necessary to achieve the desired strength.)
H.Aggregate: Use coarse aggregate (3/8 to No. 16) per ASTM C33 If other gradation of aggregate is to be used, submit data on proposed material to owner for approval.
I.Admixture shall conform to (type a water reducing admixtures – ASTM C494) Type B retarding – ASTM C494) Type D water reducing/retarding – ASTM 494
Also a hydration stabilizer can be utilized and is recommended in the design and production of pervious concrete. This stabilizer suspends cement hydration by forming a protective barrier around the cementitious particles, which delays the particles from achieving initial set. The admixture’s primary function should be as a hydration stabilizer, however it must also meet the requirements of ASTM C 494 Type B Retarding or Type D Water Reducing/Retarding admixturers.
J.Water to Comply with ASTM C94
PART 3 – EXECUTION
3.1EXAMINATION
a.The sub-grade for Bomanite Pervious Concrete shall be prepared for expected loading and drainage requirements. Sub-grade for vehicle traffic shall be in accordance with local concrete street specifications. (NOTE: Because of the wide variety of soil types, weather and anticipated loading, it is not possible to recommend one specific sub-grade design. The specifier should keep in mind that Bomanite Pervious Concrete is porous, and much of the water that falls on the surface will pass through to the sub-grade. For most applications, except for very heavy loads, native soil having a minimum “R” Value of 30 and a compaction of 95% will provide a suitable sub-grade. In areas having poor soil and/or very heavy anticipated loads, 4" or more of soil should be excavated and replaced with compacted base rock.) If an open void or gravel filled system is being utilized as a fully pervious system, a minimum of an 18” bed of clear granular stone will be required to provide an adequate reservoir. Consult General Contractor, Structural Engineer, Architect and Concrete Contractor prior to installation of concrete slab to ensure complete understanding of substrate preparation, reinforcement, penetrations, mix design, placing and finishing requirements, water capacity, elevations, etc.
b.The Pervious Concrete shall have no rebar reinforcement placed in the slab.
3.2PREPARATION
A.Examine sub-grade, with installer present, for conditions affecting performance of finish. Rectify conditions detrimental to timely and proper work. Do not proceed until unsatisfactory conditions are corrected.
B.Verify that elevations and compaction meet Project Conditions above.
3.3INSTALLATION
A.Construction Process:
1. Pervious concrete pavement shall be placed above a storm water management system capable of preventing water from standing in the pavement following a storm event.
2. Pavement thickness shall be designed by a professional engineer. Minimum thickness for all applications (excluding heavy traffic loads) shall be a single –coarse placement with a minimum thickness of 6 inches (15cm) unless otherwise specified. Pavements frequently used by vehicles heavier than single axle service/delivery trucks shall have a minimum thickness of 8 inches (20cm).
3. Formwork materials are permitted to be of wood or steel and shall be the full depth of the pavement. Caution should be used to protect the filter fabric and impermeable membranes from puncture of tear when placing forms and form pins. Forms shall be of sufficient strength and stability to support mechanical equipment without deformation of plan profiles following spreading,strike –off and compaction operations. Forms may have a removable spacer of 1/2inch (13mm) thickness placed above the depth of pavement. The spacers shall be removed following placement and vibratory strike off to allow roller compaction. (Removable spacers may not be necessary if other means of strike off and consolidation are used, such as a motorized or hydraulically actuated weighted pipe roller screed.)
4. Production: Pervious concrete shall be manufactured and delivered in accordance with ASTM C 94.
5. Transportation: Pervious concrete may be transported or mixed on site and discharge of individual loads shall be completed within one (1) hour of the introduction of mixture water to the cement. Discharge times may be extended beyond one hour when an increased dosage of hydration stabilizer is used to maintain a wet metallic sheen.
6. Discharge: Each truckload shall be visually inspected for moisture consistency. Water addition shall be permitted at the point of discharge to obtain the requiredmixture consistency, and as needed to maintain a wet metallic sheen. A minimum of 30 revolutions at the manufacturer’s designated mixing speed shall be required following the addition of any water to the mixture, prior to further discharge. If water is added more than three times to a load, the dosage rate of hydration stabilizing admixture should be increased in subsequent loads. Discharge shall he a continuous operation and shall be completed as quickly as possible. Concrete shall be deposited as close to its final position as practical and such that discharged concrete is incorporated into previously placed plastic concrete. If consolidation occurs during concrete discharge, placement shall be halted, the mixture shall be addressed, and the consolidated portion removed and replaced immediately.
b. Placing and Finishing:
1. The base shall be in saturated but not flooded condition at time of placement. Failure to provide a moist base will result in an absorption of water from the pervious concrete into the base, consequently reducing the concrete strength and overall quality of the pavement
2. Concrete may be deposited into the forms by mixer truck chute, conveyor or buggy.
3. Placing, finishing, and tooled jointing must be completed within 20 minutes from the time the pervious concrete is discharged from the truck.
4. Unless otherwise permitted, the Contractor shall utilize a mechanical vibratory screedto strike off the concrete ½ in. to ¾ in. (13 mm to 19 mm) above final elevation, utilizing the form spacers described above.
5.Care must be taken to prevent closing the void structure of pervious concrete. Finishing operations not described in this guide are not allowed. Internal vibration shall not be permitted. (If surface vibration is applied, it shall be shut off immediately when forward progress is halted for any reason.)
6. Placed concrete shall not be disturbed while in the plastic state including edging. Low spots after the screeding operation shall be over-filled for surface repair and tamped tothe desired elevation with hand tampers or re-screeded with the motorized or hydraulically actuated weighted pipe roller screed.
7. Following strike-off, remove spacers and compact the concrete to the form level utilizing a steel roller, a plate compactor on plywood or other method approved by the Architect/Engineer.
8. Freshly compacted concrete shall be protected from evaporation using the practices listed in this document under curing.
9. Cross rolling should be performed using the minimum number of passes required to achieve an acceptable surface. Over working the concrete surface will close voids and limit porosity.
10.Care shall be taken during compaction that sufficient compaction force is achieved without excessively working the concrete surface that might result in sealing surface porosity.
c. Jointing
1. Joints in pervious pavements may be omitted at the option of the owner, who may instead choose to accept or prefer the appearance of random cracking.
2. Although longer joint spacing may control cracking, for conservative design, contraction joints shall be installed at regular intervals not to exceed 20 ft (6.1 m). Slab length shall not exceed 1.5 times slab width. Transverse contraction joints shall be installed at ¼ the depth of the thickness of the pavement. These joints are to be installed as quickly as possible in the plastic concrete.
3. Jointing plastic concrete: Joints installed in the plastic concrete may be constructed utilizing a small roller as know to pervious contractors. When this option is used it shall be performed immediately after roller compaction and prior to curing. If the Engineer allows sawed joints in writing, they shall be constructed using an early entry or wet saw.
Note: Sawed joints may exhibit additional raveling, and any dust or slurry generated shall be removed during the sawing operation.
4. Transverse construction joints: Transverse construction joints shall be installed whenever placement is suspended for 30 minutes or whenever concrete is no longer workable.
5. Isolation joints: Isolate slabs from other parts of the structure, such as walls, footings, columns, garage slabs, stairs, light poles, and other points of restraint. Isolation joints permit independent vertical and horizontal movement between adjoining parts of thestructure and help minimize cracking.
6. Edging shall be performed along isolation joints and construction joints in order to reduce potential for raveling under traffic.
d. Curing:
1. Curing procedures shall begin immediately but no later than 20 minutes from the timethe pervious concrete is discharged from the truck. Placing, finishing, and tooled jointing must be completed within the 20-minute window after discharge. The pavement surface shall be covered with a minimum of 6 mil thick polyethylene sheet or other approved covering material. The cover shall overlap and be sealed at all edges and shall be secured (without using dirt or stone) to prevent uncovering due to winds or adjacent traffic conditions. For additional guidance on hot weather concreting, see ACI 305; for cold weather concreting see ACI 306.
2. Due to the low water-to-cement (cementitious) ratio and large areas of exposed surface, pervious concrete is especially susceptible to drying out. The surface shall be kept moist and evaporation prevented using some or all of the following methods:
a) Fogging should start when the pervious concrete is deposited and should be continued until the plastic curing cover is placed.
b) Application of spray applied curing compound, evaporation retarder, monomolecularfilm, or covering with .5 mil plastic sheet immediately after screeding. Note that .5 mil plastic sheet used to prevent evaporation is not a substitute for the 6 mil polyethylene sheet used for curing.
c) Application of water under the plastic covering. If this method is implemented byloosening the edge of the plastic in order to spray water under the plastic cover, care must be taken to properly re-secure the plastic cover to prevent evaporation.
3. Immediately after each transverse jointing, the 6 mil polyethylene sheet curing shallbe applied.
4. The curing cover shall remain securely in place, uninterrupted, until the concrete has reached a maturity equivalent to 14 days of curing at 70°F (21°C) at 95% relative humidity. Maturity shall be determined by an independent testing laboratory. No vehicular traffic shall be permitted on the pavement until curing is complete without written permission from the Architect/Engineer.
5. The owner and general contractor are responsible to notify the contractor if the polyethylene sheeting has been removed from the finished surface prior to completion of curing, and to re-cover the material immediately until the contractor can re-install covering.
3.4PROTECTION
- General: Protect finished work from traffic until fully cured in accordance with manufacturer’s recommendations.
Contact:
Bomanite International Limited
001 303 526 8894
Additional product information, technical bulletins and specifications are available online at or through one of our Bomanite Franchise Partners. For additional assistance with specifications or technical issues, contact Bomanite International Limited.
324, Unique Ind’l Estate, Bombay Dyeing Comp., Prabhadevi, Mumbai 400 025, India.
Tel.: 91-22-30400330 Fax: 91-22-24385770 E-mail :
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