SECTION 204 - GEOGRID REINFORCEMENT OF EMBANKMENT SLOPES AND SUBGRADES
204.01 Description. This work shall consist of furnishing and installing geogrid for
reinforcement of embankment slopes and/or subgrades as shown on the plans and in conformance with th ese specifications.
204.02 Material Requirements. The geogrid shall meet the requirements of Subsection
714.15.
204.03 Construction Requirements.
204.03.1 Preparation of Design Grade of Geogrid.
204.03.1 1--Preparation of Foundation Soil . An embankment site that is to receive
geogrid reinforcement upon the foundation soil shall be cleared and graded to establish a relatively smooth surface. Trees and stumps are to be cut off at the ground line and sawdust or sand placed over these areas to provide a cushion for the geogrid.
204.03.1 2--Preparatio n of Basement Soils . An embankment that is to receive geogrid
reinforcement located within the basement soil portion of the embankment shall be brought up to the proper grade as shown on the plans and compacted to the required density. The surface shall be left rough so as to provide for a good bond with the next embankment lift above the geogrid.
204.03.1 3--Preparation of Design Soils or Subgrades . A design soil or subgrade that
is to receive geogrid shall be shaped an d compacted to the required density thus providing a smooth finish, free of loose material and sharp objects.
204.03.2 Geogrid Installation . Geogrid shall be placed coincidently with the
compacted lift nearest the design elevation shown on the plans. No partial or half-lift thicknesses are required; however, at no time shall the placement elevation deviate by more than one foot fro m the design grade. Correct orientation of the geogrid shall be verified by the Engineer. Geogrid shall be secured in-place to pr event movement while being covered.
204.03.3 Overlaps and Joints.
204.03.3 1--Uniaxial Geogrids. Uniaxial geogrid sha ll be placed in continuous
longitudinal strips in the direction of main reinforcement and adjacent strips do not need to be overlapped. However, if the Contract or is unable to complete a required length with a single continuous length of geogrid, a joint may be made with the Engineer's approval. This joint shall be made for the full width of the strip by interlacing over and under the main reinforcing strands using a solid rod or hollow pipe of similar material and strength. No end joints will be allowed in any two adjacent strips or within 10 feet of the face of the embankment or, in the case of a spill through slope, in front of the abutment. In the event that the length of geogrid reinforcement is greater than the roll length, then end joints will be allowed in adj acent strips, but they cannot be within 75 feet of one another as measured along the length of the strip. Every effort should be made to keep the number of end joints to a mini mum and widely spaced throughout the placement area.
204.03.3 2--Biaxial Geogrids. Biaxial geogrids shall be overlapped three (3) feet
between adjacent strips and four (4) feet at the ends except where otherwise noted on the plans and/or in the contract documents.
204.03.4 Placement of Fill over Geogrid. Fill placement shall conform to the
requirements of Section 203. Extreme care shall be taken to prevent slippage of the geogrid during fill placement. The fill shall be back dumped and spread on the geogrid in uncompacted lifts of at least six (6) inches before equipment is allowed to continuously operate over it. At no time will tracked equipment be allowed to operate directly upon the geogrid. Rubber tired equipment will be allowed to pass over uncovered geogrid at speeds of less than 5 mph as directed by the Engineer. Any geogrid damage caused by fill placement or equipment movement over th e geogrid will be uncovered and repaired as directed by the Engineer at no additional cost to the State.
204.04 Method of Measurement. Geogrid of the type specified will be measured by
the square yard of surface area covered. Any overwidth of geogrid installed and additional material required for laps or damage repairs will not be measured. No separate payment shall be made for shipping, handling, storage, protection, fabrication, securing pins or installation, the cost of which shall be included in the contr act price for geogrid.
204.05 Basis of Payment . Geogrid, measured as prescribed above, will be paid for at
the contract unit price per square yard, which price shall be full compensation for furnishing and placing the geogrid, pins, lapping, joints, repairs, maintaining the geogrid until covered, and satisfactorily completing the work. Payment will be made under: 204-A: Geogrid, Type ____ - per square yard SECTION 205 - HAUL
205.01 Description . When the contract contains a pay item for haul, it shall consist of
transporting excavated material from its original position to its final location in the work. Haul is designated as Haul of Unclassi fied Excavation and Haul of Classification Excavation.
205.02 Blank.
205.03 Blank.
205.04 Method of Measurement . Haul of excavation will be measured for payment
only when the bid proposal contains a pay item for haul. The pay item will identify the excavation item for which haul is to be measured. Haul will be measured on a distance-volume or distance-weight basis. The distance being 100-foot stations measured along the stationed control line of the project, and the volume or weight measured in the same manner as the excavation item.