Technical Specification -
Gravelpave2 Porous Paving with Integrated Geotextile Fabric and Anchors
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 designs loads. See 2.02 Materials.
2. Provide Gravelpave2 Paving products including
Gravelpave2 units, anchors and installation per the manufacturer's instructions
furnished under this section.
3. Provide and
install fine decorative gravel to fill the Gravelpave2 units.
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.
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 work people 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 Gravelpave2 product 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
Gravelpave2 material units from damage during delivery and store under tarp
when time from delivery to installation exceeds one week.
1.06 Project Conditions
A. Review
installation procedures and coordinate Gravelpave2 work with other work
affected.
B. All hard
surface paving adjacent to Gravelpave2 areas, including concrete walks and
asphalt paving, must be completed prior to installation of Gravelpave2.
C. Cold weather:
1. Do not use frozen materials or
materials mixed or coated with ice or frost.
2. Do not build on frozen work or wet, saturated or muddy subgrade.
D. Protect
partially completed paving against damage from other construction traffic when
work is in progress.
E. Protect adjacent work from damage
during Gravelpave2 installation.
PART
2 - PRODUCTS
2.01 Availability
A. Manufacturer: (Gravelpave2)
Invisible Structures, Inc., 1600 Jackson Street., Suite 310, Golden, CO
80401. Call from USA and Canada
800-233-1510 toll free, (International 303-233-8383), Fax 800-233-1522
(International 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 (AASHTO M6 or ASTM C-33) to be added to
mixture (25 to 35% by volume) to
ensure long-term porosity.
2. 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 (25 -
35%) to ensure long-term porosity, and are brought to proper compaction.
(Crushed shell and limerock alone can set up like concrete
unless sand is added.)
B. Gravelpave2
Paving Units: Lightweight injection molded plastic units 0.5x0.5x0.025 m
(20"x20"x1" high, 2.7 ft2 each) with hollow rings rising from a
strong open grid with a geotextile fabric heat fused to the bottom of the
grid. Units will be shipped in
pre-assembled rolls of various dimensions. Loading capability is equal to 5700 psi when filled with
sand, over appropriate depth of road base. Standard colors are black, gray, terra cotta, and tan, with
custom colors available. Unit
weight = 535 gr (19 oz.), volume = 8% solid.
C. Gravel Fill: Obtain clean, washed, fine
decorative gravel, must be sharp and angular (not rounded) stone, granite
hardness, to fill the 25 mm (1") high rings and spaces between the rings,
not to be overfilled more than 1/4” (6 mm). Maximum Size of stone should
be: 3/16” to 3/8” (5 mm to
10 mm) and uniform in size - not graded.
D. Anchors: Typical anchors
shall be 8" long nails with "fender” type washers 7 x 30 mm od
(5/16" id x 1.25" ) od, all galvanized metal or similar corrosion
resistant coating. Supplied
anchors may vary in size and type based on source and availability.
PART
3 - EXECUTION
3.01 Inspection
A. Examine
subgrade and base course installed conditions. Do not start Gravelpave2 installation until unsatisfactory
conditions are corrected. Check
for poor drainage, 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. 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 25 mm (1.0")
for Gravelpave2 unit and gravel fill to Final Grade.
3.03 Installation of
Gravelpave2 Units
A. Install the
Gravelpave2 units by placing units with rings facing up, and using small
male/female connectors provided along each edge to maintain proper spacing and
interlock the units. Cutting
can be performed with pruning shears and knife, or portable power saw. Units shall be anchored to the base
course, using anchors described above, as required to secure units in place from
movement by traffic, at an average rate of 6 pins per square meter (high speed,
heavy vehicles, fast turning movement will require additional anchors). Tops of rings shall be flush with the
surface of adjacent hard surfaced pavements.
B. Install gravel
into rings after the units are anchored by "backdumping" directly
from a dump truck, or from buckets mounted on tractors, with a minimum depth of
6”, then exit the site by driving forward over rings already filled. Sharp turning of vehicles on bare rings
must be avoided. The gravel is
then spread laterally from the pile using power brooms, blades, flat bottomed
shovels and/or wide "asphalt rakes" to fill the rings. A stiff bristled broom should be used
for final "finishing". The gravel should be "compacted", if necessary, by using a
vibrating plate or small roller, with the finish grade no less than the top of
rings and no more than 6 mm (0.25") above top of rings.
C. If a binder
for fill stone is desired (due to traffic speed, concentrated water flow, or
other reason), use Portland cement, mixed dry at 10% by weight with fill
stone,. Place into rings after
thoroughly wetting the base, then lightly mist the surface after fill and
compaction. Then, cover with a
water resistant tarp, or plastic sheeting material for a minimum period of 3
days, or until the mixture has bonded.
3.06 Cleaning
A. Remove and
replace segments of Gravelpave2 units where three or more adjacent rings are
broken or damaged, reinstalling as specified, with no evidence of replacement.
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