SECTION 218 - BITUMINOUS TREATED ROVING
218.01 Description. This work consists of furnishing and installing a layer of
bituminous treated roving to stabilize newly planted soil areas in ditches and on slopes in accordance with these specifications and at locations shown on the plans or as directed by the Engineer.
218.02 Materials.
218.02.1 General. The type of roving material, fiberglass or polypropylene, shall be at
the option of the Contractor unless otherwis e specified and shall meet the applicable requirements of Subsection 715.09.6. The glass fibers or fibrillated polypropylene yarn shall be wound onto cylindrical packages so that the roving can be continuously fed through an ejector driven by compressed air and expanded into a mat. The fibers or yarn shall be lightly bound together in a ribbon form, without the use of clay, starch, or other deleterious substances. The material shall not contain petroleum solvents, or other agents known to be toxic to plant or animal life. The roving material shall not be exposed to moisture prior to placement.
218.02.2 Bituminous Material. The bituminous material used for securing the roving
to the existing soil shall be Emulsified Asphalt, Grade SS-1, meeting the requirements of Subsection 702.07.
218.03 Construction Requirements.
218.03.1 Equipment. An air compressor shall be used in conjunction with applying the
glass fiber or polypropylene yarn. The compressor shall be capable of supplying 40 cubic feet of air per minute at a pressure of 80 to 100 pounds per square. An air gun specifically designed for spraying glass fibers or polypropylene yarn, sufficient 3/8-inch rubber hose for application, and at least one container shall be furnished for applying the material. Three spools or packages may be run simultaneously from a 125-cubic foot compressor. Equipment that cuts or breaks the roving will not be permitted. Equipment for applying the asphalt shall be capable of applying the material in a uniform spray at the rate specified.
218.03.2 General. The bituminous treated roving shall be applied over designated areas
within 24 hours following the planting or seed ing operations. The designated areas shall be free of all objects including the vegetative material for mulch that would keep the roving material from being in direct cont act with soil throughout the entire area to be treated. The upgrade and downgrade ends of the bitumi nous treated roving shall be buried in a six-inch minimum vertical slot and the soil tamped firmly against it. The bituminous treated roving shall be applied uniformly over the planted areas at one of the following rate with a ±20% tolerance:
a.Bituminous Treated Fiberglass Roving ..................... 0.50 pounds per square yard
b.Bituminous Treated Polypropylene Roving .............. 0.20 pounds per square yard The rate of distribution will be determined from the number of spools or packages of roving used on each area and the average weight of the spools or packages. A sample of at least five spools or packages designated at random by the Engineer will be taken and weighed and the average weight to the nearest pound per spool or package will be used for the truckload from which the sample was taken. Immediately following the spreading of roving, the asphaltic material shall be applied uniformly over the roving at the rate of 0.50 gallons per square yard with a ±20% tolerance. The Contractor shall be required to apply additional asphaltic material, if needed, to penetrate through the roving in sufficient quantity to secure the roving to the soil.
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Source: Standard Specifications for Road and Bridge Construction, 2017 Edition. Pages 157–158 of 1,113. View official source ↗