CSI Master
Format 32 12 43 Flexible
Porous Pavement (Section 02795 Porous Pavement)
PART 1 -
GENERAL
1.01 General
Provisions
A. The Conditions of
the Contract and all Sections of Division 1 are hereby made a part of this
Section.
1.02
Description of Work
A. Work Included:
1. Provide and install sandy gravel road base as per Geotechnical
Engineer's recommendations
and/or as shown on drawings, to provide
adequate support for project design loads. See 2.02 Materials.
2. Provide Grasspave2 Paving System products including Grasspave2 units,
Hydrogrow soil polymer, and installation per the manufacturer's instructions
furnished under this section.
3. Provide and install clean sharp sand to
fill the Grasspave2 units, when needed.
4. Provide and install grass by using sod
or hydroseeding.
B. Related Work:
1. Subgrade preparation under Section 31
20 00 Earth Moving (02200 – Earthwork).
2. Utilities and subsurface drainage - Section 33 40 00 Storm Drainage
Utilities (02700 – Subsurface Drainage and Structures), as needed.
3. Irrigation installation - Section 32 80
00 Irrigation (02810 Irrigation), when needed.
1.03 Quality
Assurance
A. Follow
Section 01 33 23 Shop Drawings, Product Data, and Samples (01340 Shop Drawings,
Product Data, and Samples) requirements.
B. Installation: Performed
only by skilled workpeople with satisfactory record of performance on
landscaping or paving projects of comparable size and quality.
1.04
Submittals
A. Submit manufacturer's product data and
installation instructions.
B. Submit a 10" x 10" section of Grasspave2 material for
review. Reviewed and accepted
samples will be returned to the contractor.
C. Submit material certificates for base
course and sand fill materials.
1.05 Delivery,
Storage, and Handling
A. Protect Grasspave2 units from damage during delivery and store under
tarp to protect from sunlight, when time from delivery to installation exceeds
one week. Keep Hydrogrow in a dark
and dry location.
1.06 Project
Conditions
A. Review installation procedures and coordinate Grasspave2 work with other
work affected. Generally,
Grasspave2 is installed at the same time as project grass installation, nearly
the last site construction activity.
B.
All hard surface paving adjacent to
Grasspave2 areas, including concrete walks and asphalt paving must be completed
prior to installation of Grasspave2.
C.
Gradients for grass porous paving surfaces
can vary from flat to 20%, depending upon vehicle types to use the
surface. Please note that fire
lanes, or other emergency vehicles, will generally require a gradient that is
less than 6%. If there are any
questions regarding existing gradients on this project, please contact the
Project Designer, or Invisible Structures, Inc.
D. Cold weather:
1. Do not use frozen materials or materials mixed or coated with ice or
frost. Be careful in handling
rolls of Grasspave2 in temperatures below 50 degrees F, as product connectors
become stiff and can separate, and the individual units will retain the roll
curl until warmed to room temperature (aided by placement in sun for 15 to 20
minutes). If cold weather is
anticipated, Grasspave2 can be shipped in flat sheets that measure 1-meter (40”)
square.
2. Do not build on frozen work or wet,
saturated or muddy subgrade.
E. Protect partially completed paving against damage from other
construction traffic when work is in progress, and until grass root system has
matured (about 3 to 4 weeks). Any
barricades constructed must still be accessible by emergency and fire equipment
during and after installation.
F. Protect adjacent work from damage
during Grasspave2 installation.
PART 2 -
PRODUCTS
2.01
Availability
A. Manufacturer: (Grasspave2,
Hydrogrow) Invisible Structures, Inc., 1600 Jackson Street., Suite 310, Golden,
Colorado 80401. Call from USA and
Canada 800-233-1510 toll free, International 303-233-8383, Fax 303-233-8282.
B. Local Sales Representative: (Contact Manufacturer)
2.02 Materials
A. Base Course: Sandy gravel material from local sources commonly used for
road base construction, passing the following sieve analysis.
Sieve %Passing
1” 100
3/4" 90-100
3/8” 70-80
#4 55-70
#10 45-55
#40 25-35
#200 3-8
1. Sources of the material can include either "pit run" or
"crusher run.” Crusher run
material will generally require sharp sand to be added to mixture (33% by
volume) to ensure long-term porosity. If there is difficulty in finding local sources to meet this sieve
analysis, and alternative mixture can be created by mixing 2/3 crushed drainage
rock (0.75” dia) with 1/3 concrete or sharp sand (AASHTO M6 or ASTM C-33).
2. Selected materials should be nearly neutral in pH (range from 6.5 to 7.2) to provide
adequate root zone development for turf.
3. Alternative materials such as crushed shell, limerock, and/or crushed
lava may be considered for base course use, provided they are mixed with sharp
sand (33%), and brought to proper compaction.
(Crushed shell and limerock alone can set
up like concrete without sand added.)
B.
Hydrogrow Mix: A mixture made from several
commercial products including: 1) cross-linked polyacrylimide (<0.1%)
polymer, which is non-toxic and neutral in pH, and will absorb 150 to 350 times
its weight in water from most tap sources; 2) ZeoPro zeolite mineral, amended
with small amounts of starter fertilizers, from Zeoponix, Inc.; 3) Isolite
porous ceramic, designed to hold large amounts of water without physical
degradation or change of size of particle, from Sumitomo Group; 4) and
aggromolated Humate, a natural source of nutrients and micronutrients, from
Tri-C Enterprises.
C. Grasspave2 Grass Paving Units: Lightweight injection-molded plastic
units 0.5x0.5x0.025m (20"x20"x1" high, 2.7 ft2 each) with hollow
rings rising from a strong open grid allowing maximum grass root penetration
and development. The plastic shall
be 100% post-consumer recycled plastic resins, predominately HDPE, with minimum
3% carbon black concentrate added for UV protection.
Loading capability is equal to 402 kg/cm2 (5700 psi) when
filled with sand, over an appropriate depth of road base. Standard color is black. Unit weight = 510 g (18 oz.), volume =
8% solid. Units may also be
shipped in pre-assembled into rolls that vary from 10 square meters (108 sf) to
125 square meters (1345 sf).
D. Sand: Obtain clean sharp
sand (washed concrete sand- AASHTO M6 or ASTM C-33) to fill the 25 mm (one
inch) high rings and spaces between the rings when seeding or using 13 mm (half
inch) thick sod (soil thickness).
E. Grass: Use species
resistant to wear by traffic generally a Blue/Rye/Fescue mix used for athletic
fields in northern climates, and Zoysia, Fescue, or Bermuda types in southern
climates. (Check with local sod and seed suppliers for preferred mixtures.)
(Dedicated fire lanes can use same grass species used on surrounding turf.)
(Parking applications require greatest wear-resistant species possible,
generally available only by seed or sprigging.)
(Choose one of
the following paragraphs to suit project requirements.)
1. Sod: Use 13 mm (0.5")
thick (soil thickness) rolled sod from a reputable local grower. Species should be wear resistant, free
from disease, and in excellent condition. Sod shall be grown in sand or sandy loam soils only. Sod grown in soils of clay, silt, or
high organic materials such as peat, will not be accepted.
2. Seed: Use seed materials,
of the preferred species for local environmental and projected traffic
conditions, from certified sources. Seed shall be provided in containers clearly labeled to show seed name,
lot number, net weight, % weed seed content, and guaranteed % of purity and
germination. Pure Live Seed types
and amount shall be as shown on plans.
F. Mulch: (Needed only for
seeding.) Shall be of wood or paper cellulose types of commercial mulch
materials often used in conjunction with hydroseeding operations. Mulches of straw, pine needles, etc.
will not be acceptable because of their low moisture holding capacity.
G. Fertilizer: A commercial
"starter" fertilizer, with Guaranteed Analysis of 17-23-6, or as
recommended by local grass supplier, for rapid germination and root
development.
H. Grasspave2 Sign: A sign to identify the presence of Grasspave2 paving,
stating that special maintenance is required, with the Manufacturer's phone
number, and made of durable materials for outdoor exposure shall be provided
and installed.
I. Fire lane Signage & Delineation: Fire lanes must
be identified regarding their entrance and physical location with the placement
of signs, gates, curbs, bollards, etc. Specific signage wording and other details must be coordinated with and
approved by local fire authorities.
PART 3 -
EXECUTION
3.01
Inspection
(It is recommended that Fire Department inspectors be scheduled
to inspect installation of Grasspave2 during preparation of the subbase,
installation of the base course, and installation of Grasspave2 units. Most small projects can accommodate
these inspections all on the same day. Verify with Fire Department if certificates of inspection are required.)
A. Examine subgrade and base course installed conditions. Do not start Grasspave2 installation
until unsatisfactory conditions are corrected. Check for improperly compacted trenches, debris, and improper
gradients.
B. Installation constitutes acceptance of existing conditions and
responsibility for satisfactory performance. If existing conditions are found unsatisfactory, contact
Project Manager for resolution.
3.02
Preparation
(Ensure that
subbase materials are structurally adequate to receive designed base course,
wearing course, and designed loads. Generally, excavation into undisturbed normal strength soils will
require no additional modification. Fill soils and otherwise structurally weak soils may require
modifications, such as geotextiles, geogrids, and/or compaction (not to exceed
90%). Ensure that grading and soil
porosity of the subbase will provide adequate subsurface drainage.)
A. Place base course material over prepared subbase to grades shown on
plans, in lifts not to exceed 150 mm (6"), compacting each lift separately
to 95% Modified Proctor. Leave
minimum 25 mm (1”) to 35 mm (1.5") for Grasspave2 unit and sand/sod fill
to Final Grade.
B. Spread all Hydrogrow mix provided (spreader rate = 4.53 kg per 100 m2
(10 lbs per 1076 ft2) evenly over the surface of the base course with a
hand-held, or wheeled, rotary spreader. The Hydrogrow mix should be placed immediately before installing the
Grasspave2 units to assure that the polymer does not become wet and expanded
when installing the units.
3.03
Installation of Grasspave2 Units
A. Install the Grasspave2 units by placing units with rings facing up, and
using pegs and holes provided to maintain proper spacing and interlock the units. Units can be easily shaped with
pruning shears or knife. Units
placed on curves and slopes shall be anchored to the base course, using 16d
Common nails with fender washer, as required to secure units in place. Tops of rings shall be between 6 mm to 13
mm (0.25" to 0.5") below the surface of adjacent hard-surface
pavements.
B. Install sand in rings as they are laid in sections by
"back-dumping" directly from a dump truck, or from buckets mounted on
tractors, which then exit the site by driving over rings already filled with
sand. The sand is then spread
laterally from the pile using flat bottomed shovels and/or wide "asphalt
rakes" to fill the rings. A
stiff bristled broom should be used for final "finishing" of the
sand. The sand must be
"compacted" by using water from hose, irrigation heads, or rainfall,
with the finish grade no less than the top of rings and no more than 6 mm
(0.25") above top of rings.
3.04
Installation of Grass
(Choose one
paragraph below to meet grass installation method desired.)
A. (Preferred method) Hydroseeding/hydro-mulching - A combination of water,
seed and fertilizer are homogeneously mixed in a purpose-built, truck-mounted
tank. The seed mixture is sprayed onto the site at rates shown on plans and per
hydroseeding manufacturer's recommendations. Coverage must be uniform and complete. Following germination of the seed,
areas lacking germination larger than 20 cm x 20 cm (8" x 8") must be
reseeded immediately. Seeded areas must be fertilized and kept moist during
development of the turf plants.
B. Install thin sod directly over sand filled rings, filled no higher than
the top of the rings. Sod strips
should be placed with very tight joints. Sodded areas must be fertilized and kept moist during root establishment
(minimum of 3 weeks). Sodded areas
must be protected from any traffic, other than emergency vehicles, for a period
of 3 to 4 weeks, or until the root system has penetrated and established well
below the Grasspave2 units.
C. Install grass seed at rates per grass
type. A light “dusting” of
commercial topsoil mix, not to exceed 1/2” (25 mm) can be placed above the
rings and seed mix to aid germination rates. Seeded areas must be fertilized and kept moist during
development of the turf plants.
3.05
Protection
(Choose one
paragraph below to match grass installation method.)
A. Seeded areas must be protected from any traffic, other than emergency
vehicles, for a period of 4 to 8 weeks, or until the grass is mature to handle
traffic.
B. Sodded areas must be protected from any traffic, other than emergency
vehicles, for a period of 3 to 4 weeks, or until the root system has penetrated
below the Grasspave2 units.
3.06 Cleaning
A. Remove and replace segments of Grasspave2 units where three or more
adjacent rings are broken or damaged, reinstalling as specified, so no evidence
of replacement is apparent.
B. Perform cleaning during the installation of work and upon completion of
the work. Remove all excess
materials, debris, and equipment from site. Repair any damage to adjacent materials and surfaces
resulting from installation of this work.
END OF SECTION
If you have any
questions regarding this specification, please call Invisible Structures, Inc.
1-800-233-1510, overseas call 303-233-8383.
Version 09/2008