3.6
VOID FILLER AND SEEDING
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NOTE: Topsoil will consolidate in the voids.
Overfilling above the top of block is common to
increase the topsoil fill level, but may increase
sedimentation during turf establishment.
Broadcast seeding of ACB is difficult because it is
difficult to rake the seed in. Hydroseeding of ACB
is difficult because of channelization of runoff and
susceptibility of the void filler to desiccation.
In areas where establishment of quality turf is
important, it has been successful to blend a rich
mixture of seed (about 10 times the normal
application rate, or about 0.5 to 1 kg/cubic m (1 to
2 pounds per cubic yard) into the topsoil prior to
placing. Watering during establishment is more
critical than typical turf due to the heat
absorption of the concrete blocks and capillary
break of the geotextile.
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The voids of the articulating concrete block mats shall be filled with
topsoil, except that voids below the normal water level shall be filled
with aggregate void filler. All cable ties and anchoring shall be
completed prior to filling voids. Seeding and maintenance shall be
completed in accordance with Section 02921 SEEDING.
3.7
PROTECTION OF WORK
Work shall be protected against damage from subsequent operations.
Displaced or broken blocks shall be removed and replaced to conform to all
requirements of this section. Damaged material shall not be incorporated.
Equipment shall not be allowed on the ACB that could crack, cause abrasion,
or otherwise damage the blocks. Vehicles shall not operate directly on
geotextile, except that rubber tired vehicles may operate directly on short
reaches of geotextile that meets or exceeds AASHTO M 288 survivability
requirements for Class 1 geotextile, if there is no rutting, if the vehicle
access is necessary to accomplish the work, and if the Contracting Officer
observes the operation and approves. Vehicles shall not operate on the ACB
until (during or after) placement of void filler. Vehicle traffic on the
ACB shall be restricted to light weight rubber tired vehicles, and where
intermittent access is necessary to accomplish the work. Routine haul
routes shall not be established on the ACB. These allowances shall not
waive the Contractor's obligation to maintain the installation until
acceptance, and verify that vehicle access does not crack, or in any way
damage, the ACB.
3.8
QUALITY CONTROL TESTING
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NOTE: The manufacturer should have completed
similar testing for it's own QC. The following
testing is suggested as an acceptance check on a
schedule typical for QA. The suggested frequency is
on the order of 0.5% of construction cost.
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SECTION 02382
Page 20
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