Porous Granular Backfill Art. 209.04
208.03 Method of Measurement. This work will be measured for payment as
follows.
a.Contract Quantities. The requirements for the use of Contract Quantities shall conform to Article 202.07(a).
b.Measured Quantities. Trench backfill shall be furnished for backfilling to the full width of the trench. It will be measured in cubic yards (cubic meters) in place, except that the quantity for which payment will be made shall not exceed the volume of the trench as computed by using the maximum width of trench permitted by the Specifications and the actual depth of the completed trench backfill above the center of the pipe, with a deduction for the volume of one-half of the pipe. Any material conforming to the requirements of Articles 1003.04 or 1004.05 which has been excavated from the trenches shall be used for backfilling the trenches. No compensation will be allowed as trench backfill for the portion of the trench backfilled with excavated material.
208.04 Basis of Payment. This work will be paid for at the contract unit price
per cubic yard (cubic meter) for TRENCH BACKFILL. SECTION 209. POROUS GRANULAR BACKFILL
209.01 Description. This work shall consist of furnishing and placing porous
granular material for backfilling tile or pipe in trenches.
209.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Coarse Aggregate .............................................................................. 1004.05
b.Fine Aggregate .................................................................................. 1003.04 CONSTRUCTION REQUIREMENTS
209.03 General. The porous granular material shall be placed around the tile
or pipe for the full width of the trench. This material shall be carried to the top of all water bearing strata intercepted by the trench or to a minimum of 1 ft (300 mm) above the tile or pipe, as directed by the Engineer. The material shall be placed in lifts not exceeding 6 in. (150 mm) in thickness and compacted in a manner approved by the Engineer. The balance of the trench shall be backfilled with approved natural soil. Surplus excavated material shall be disposed of according to Article 202.03.
209.04 Method of Measurement. Porous granular backfill will be measured
for payment in cubic yards (cubic meters) in place, except that the quantity for which payment will be made shall not exceed the volume of the trench as computed by using the maximum width of trench permitted by the Specifications and the actual depth of the completed porous granular backfill above the invert of the pipe, with a deduction for the volume of the pipe. Any porous granular backfill used for the Art. 209.05 Porous Granular Backfill purpose of filling the trench in excess of the maximum quantity specified shall be furnished and placed by the Contractor at his/her own expense.
209.05 Basis of Payment. This work will be paid for at the contract unit price
per cubic yard (cubic meter) for POROUS GRANULAR BACKFILL. SECTION 210. FABRIC FOR GROUND STABILIZATION
210.01 Description. This work shall consist of furnishing and installing
geotechnical fabric in subgrades or as embankment foundations.
210.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Geotextile Fabric ................................................................................ 1080.02
b.Coarse Aggregate (Note 1) ................................................................ 1004.04 Note 1. The coarse aggregate shall be that specified for granular embankment, special. CONSTRUCTION REQUIREMENTS
210.03 Installation Requirements. Fabric shall be delivered to the job site in
such a manner as to facilitate handling and incorporation into the work without damage. The fabric shall be stored out of direct sunlight. Prior to the installation of the fabric, the application surface shall be cleared of debris, sharp objects and trees. Tree stumps shall be cut to the level of the ground surface. If the stumps cannot be cut to the ground level, they shall be completely removed. In the case of subgrades, wheel tracks or ruts in excess of 2 in. (50 mm) in depth shall be graded smooth or otherwise filled with soil to provide a reasonably smooth surface. Fabric may be installed on the application surface either by hand or by mechanical methods, provided the surface is not rutted. Fabric of insufficient width or length to fully cover the specified area shall be lapped or sewn. The minimum laps for lap only areas are 2 ft (600 mm) and for sewn areas are 4 in. (100 mm). If sewn, the seam strength shall be equal to or exceed the minimum required grab strength of the fabric according to Article 1080.02.
210.04 Placement of Granular Blanket. The granular blanket shall be
constructed to the width and depth required on the plans. Granular embankment, special shall be used in conjunction with the geotechnical fabric. The material shall be back dumped on the fabric in a sequence of operations beginning at the outer edges of the treatment area with subsequent placement towards the middle. Placement of material on the fabric shall be accomplished by spreading dumped material off of previously placed material with a bulldozer blade or endloader, in such a manner as to prevent tearing or shoving of the cloth. Dumping of material directly
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 112–113 of 1,217. View official source ↗