00331.00 282 Section 00331 - Subgrade Stabilization Description
00331.00 Scope - This Work consists of excavating and disposing of unstable materials in
excavation areas only and placing Subgrade geosynthetic, stone embankment, and Aggregate backfill to the lines and grades as shown or directed. Materials
00331.10 Materials - Furnish Material s meeting the following requirements:
Aggregate Base ......................................................................................... 02630 Aggregate Subbase .......................................................................... 00641.10(b) Stone Embankment ............................................................................... 00330.16 Subgrade Geotextile ................................................................................... 02320 Subgrade Reinforcement Geogrid .............................................................. 02320 Water .......................................................................................................... 00340
00331.16 Acceptance of Backfill - The backfill Material will be accepted based on visual inspection.
The Engineer may perform tests if deemed necessary. Equipment
00331.20 General - Provide all Equipment necessary to perform the Work according to Se ctions
00330, 00340, 00350, and 00641. Construction
00331.40 Excavation - Excavate unstable material to the lines and grades as shown or directed.
Dispose of the excavated material according to 00330.41(a)(5).
00331.41 Geosynthetic :
a.Geotextile - Place geotextile as shown.
b.Subgrade Reinforcement Geogrid:
1.Placement - Prepare the surface receiving geogrid to a smooth, uncompacted condition to the depth shown and as follows: • Orient the geogrid r olls parallel to the R oadway centerline. • Unroll the geogrid in the same direction as Aggregate Base placement. If the geogrid shifts or becomes misaligned, realign it and anchor it according to the manufacturer's recommendations.
2.Overlaps - Overlap the geogrid a minimum of 24 inches. Overlap the geogrid in the same direction as Aggregate Base placement with the preceding layer lapped on top of the following layer.
3.Protection of Geogrid - Drive rubber tired Equipment on the geogrid at no more than 5 mph. Drive tracked Equipment on the geogrid only after placing a minimum of 6 inches of Aggregate Base on top of the geogrid. Do not turn or make sudden stops or starts on the geogrid or the Aggregate Base . 00331.90 283 During installat ion cover the geogrid with the Aggregate Base as soon as possible. Do not leave uncovered for more than 5 Calendar Day s.
4.Repair - Repair or replace damaged or torn geogrid according to manufacturer's recommendations at no cost to the Agency.
00331.42 Backfill - Place the backfill Material to lines and grades as shown or directed, to provide a
homogeneous mixture. Compact the backfill until there is no reaction or yielding under the compactor. Measurement
00331.80 Measurement - The quant ities of Subgrade stabilization will be measured on the area
basis of Subgrade surface area stabilized to the full depth as shown. The surface area will be determined by horizontal measurements. In areas where directed to stabilize to a depth other than shown, the areas will be adjusted by converting to an equivalent number of squ are yards on a proportionate volume basis. Payment
00331.90 Payment - The accepted quantities of Subgrade stabilization will be paid for at the Contract
unit price, per square yard, for the item "____ I nch Subgrade Stabilization". The depth of stabili zation will be inserted in the blank. Payment will be payment in full for furnishing and placing all Material s, and for furnishing all Equipment , labor, and Incidental s necessary to complete the Work as specified. No separate or additional payment will b e made for excavation, geosynthetic, stone embankment or Aggregate backfill Material , or water.
Subgrade Stabilization in other states
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Source: Oregon Standard Specifications for Construction, 2024 Edition. Pages 348–349 of 1,268. View official source ↗