567 SECTION 645 REINFORCED SOIL SLOPES
645.1 -DESCRIPTION : The following are specification guidelines for Reinforced Soil Slope (RSS) construction. Work shall consist of constructing the proposed RSS as specified and furnishing all materials for use in construction of reinforced soil slopes. The minimum length of the soil reinforcing as measured from the slope face to the back of the soil stabilized mass, is as shown in the plans. Any staged or temporary construction affecting the RSS stability shall be the responsibility of the Contractor. The Engineer shall approve the geosynthetic material and supplier.
645.2 -MATERIALS : 645.2.1 -Geosynthetics Soil Reinforcing: Cutting of geosynthetic reinforcing longit udinal to the Slope face or at vertical obstacles shall not be permitted. End to End splicing of geosynthetic material will not be permitted. The geosynthetic used shall meet the minimum requirements shown on the plans. Each roll of geosynthetic material shall be labeled as to its properties. Geosynthetics shall be made of polypropylene, high -density polyethylene or high -tenacity polyester fibers having cross - sections sufficient to permit significant mechanical interlock with the soil /backfill. Geosynthetics shall have a high tensile modulus in relation to the soil/backfill. Geosynthetics shall have a high resistance to deformation under sustained long term design loads while in service and resistant to ultraviolet degradation, to dama ge under normal construction practices and to all forms of biological or chemical degradation normally encountered in the material being reinforced. Store the geosynthetics in conditions above 20º F and not greater than 140º F. Prevent mud, wet cement, e poxy, and like materials from coming into contact with and affixing to the geosynthetic material. Rolled geosynthetic may be laid flat or stood on end for storage. Cover the geosynthetic and protect from sunlight prior to placement in the wall system. Carefully inspect all reinforcement to ensure they are the proper size and free from defects that may impair their strength and durability. The geosynthetic reinforcement structure shall be dimensionally stable and able to retain its geometry under constru ction stresses and shall have high resistance to damage during construction. The contractor shall submit a manufacturer’s certification that the geosynthetics supplied meets the design criteria shown on the plans, measured in full accordance with all test methods and standards specified. In case of dispute over validity of values, the Engineer can require the contractor to supply test data from an approved laboratory to support the certified values submitted. The Contractor’s submittal's package shall in clude actual test results for tension/creep, durability/aging, construction damage, pullout, quality control and a copy of the Manufacturers installation procedures. Also included shall be the Long -Term Design Strength (LTDS) of the Geosynthetic material with the assumptions used to calculate it. The Manufacturer shall also provide written certification that all resin used to produce the geosynthetic is virgin and classified as high density polyethylene, polypropylene, or high tenacity polyester and is capable of withstanding 150 hours of testing per ASTM D4355 with no measurable reduction in the ultimate tensile strength or the deterioration of the coating of the geosynthetic material. If the geosynthetic material is to be used to wrap the face of the sl ope then the testing per