7-89 Signals" and all applicable commentary. Breakaway Support Cert ification of both breakaway and structural adequacy shall be provided by the Manu facturer. Design calculations or test data of production samples to support cert ification shall be provided. Breakaway support components shall provide the same or greater structural strength as the support post or pole utilizing the breakaway device. SECTION 722 - GEOTEXTILES
722.00 General Geotextile Property Requirements This is a mat erials specification
covering geotextile fabrics for use in stabilization/reinforcem ent, drainage, erosion control and separation applications. This specification sets forth a s et of physical, mechanical and endurance properties that must be met, or exceeded, by the geot extile being manufactured. This specification is intended to assure both good quality and performance of geotextiles but is possibly not adequate for the c omplete specification in a sp ecific situation. Additional tests, or more restrictive values for the tests indicated, may be necessary under conditions of a particular application. This specification is based on geote xtile survivability from installation stresses. This Section is intended for use in con junction with Section 620 - Geotextiles. Table 1 provides strength properties for three geotextile cla sses. The geotextile shall conform to the properties in Table 1 based on the Geotext ile Class required in the application specific sections which follow. All Table 1 property values represent Minimum Average Roll Va lue (MARV) in the weakest principal direction and shall meet or exceed the va lues stated below. The geotextile properties required for each Class are dependent on geotextile elongation. Table 1 - Geotextile Strength Property Requirements Test Method a Class 1b Class 2b Class 3b Elongation Elongation Elongation <50%c 50%c <50%c 50%c <50%c 50%c Grab Strength (lbs) D 4632 315 202 247 157 180 112 Sewn Seam Strengthd (lbs) D 4632 283 182 223 142 162 101 Tear Strength (lbs) D 4533 112 79 90e 56 67 40 Puncture Strength (lbs) D 6241 618 433 495 309 371 223 Other Test Methoda Conformance D 4759 Sampling and Testing D 4354 Storage and D 4873 7-90 Handling aASTM test method. bRequired geotextile class is designated in Tables 2, 3, 4, 5, o r 6 for the indicated application. The severity of installation conditi ons for the application general ly dictates the required geotextile class. Class 1 is specified for more severe or harsh installation cond itions where there is a greater potential for geotextile damage, and Classes 2 and 3 are specified for le ss severe conditions. cAs determined in accordance with ASTM D 4632. The strengths spe cified in the columns labeled “<50%” and “≥50%” refer to the elongation at which the geotexti le material was tested. For example; if a fabric is tested at 15% elongation then it must meet or ex ceed the minimum strength shown in the “<50%” column. Submittals must include the percent elongation a t which the material was tested. dWhen sewn seams are required. eThe required MARV tear strength for woven monofilament geotexti les is 56 pounds.
722.01 Stabilization/Reinforcement Geotextile The Stabilizati on/Reinforcement
Geotextile shall meet or exceed the requirements of Table 2. A ll property values, with the exception of Apparent Opening Size (AOS), represent MARV in the weakest principal direction. Values for AOS represent maximum average roll value s. Both woven and nonwoven geotextiles are acceptable; however, w oven “slit-film” geotextiles will not be allowed and woven geotextiles will not be allowed for subgrade stabilization/reinforcement under pavement structural sections. Table 2 - Stabilization/Reinforcement Geotextile Property Value s Other Properties Test Method Requirements Geotextile class Class 1 from Table 1a Permittivity (minimum) ASTM D 4491 0.05/secb Apparent Opening Size (AOS) ASTM D 4751 0.43mm (maximum) Ultraviolet Stability (Retained Strength) ASTM D 4355 50% after 500 hours of exposure aDefault geotextile selection. Cla ss 2 or 3 may be specified ba sed on survivability or field testing. bPermittivity of the geotextile shoul d be greater than that of t he soil. The Resident may also require the permeability of the geotextile to be greater than that of the s oil.
722.02 Drainage Geotextile The Drainage Geotextile shall meet or exceed the
requirements of Table 3. All property values, with the excepti on of AOS, represent MARV in the weakest principal direc tion. Values for AOS represent m aximum average roll values. Both woven and nonwoven geotextiles are acceptable, however, w oven "slit-film" geotextiles will not be allowed. Table 3 - Drainage Geotextile Property Values Other Properties Test Method Requirements Percent In-Situ Soil Passing #200 (0.075 mm) a <15% 15% to 50% >50% Geotextile class Class 2 from Table 1b 7-91 Permittivityc, d (minimum) ASTM D 4491 0.5/sec 0.2/sec 0.1/sec Apparent Opening Size (AOS) mm (maximum)c, d ASTM D 4751 0.43 0.25 0.22e Ultraviolet Stability (Retained Strength) ASTM D 4355 50% after 500 hours of exposure aBased on grain size analysis of in situ soil in accordance with AASHTO T 88. bDefault geotextile selection. Class 3 may be specified based o n survivability, field testing or specific drain construction requirements. cThese default filtration property values are based on predomina nt particle sizes of the in-situ soils. In addition to the default permittivity value, the Resident may re quire geotextile permeability and/or performance testing based on engineering design for drainage sy stems in problematic soil environments. dSite specific geotextile design should be performed especially if one or more of the following problematic soil environments are encountered: unstable or high ly erodable soils such as non-cohesive silts; gap graded soils; alternating sand/silt laminated soils; dispersive clays; and/or rock flour. eFor cohesive soils with a plasticity index greater than 7, geot extile maximum average roll value for apparent opening size is 0.30mm.
722.03 Erosion Control Geotextile The Erosion Control geotext ile shall meet or
exceed the requirements of Table 4. All property values, with the exception of AOS, represent MARV in the weakest principal direction. Values for AOS represent maximum average roll values. Both woven and non-woven geotextiles are acceptable; however, w oven "slit-film" geotextiles will not be allowed. Table 4 – Erosion Control Geotextile Property Values Other Properties Test Method Requirements Percent In-Situ Soil Passing #200 (0.075 mm) a <15% 15% to 50% >50% Geotextile class: Woven monofilament geotextiles All other geotextiles Class 2 from Table 1 (see below) Class 1 from Table 1 (see below) Permittivitya, b (minimum) ASTM D 4491 0.7/sec 0.2/sec 0.1/sec Apparent Opening Size (AOS) mm (maximum) b, c, d ASTM D 4751 0.43 0.25 0.22c, d Ultraviolet Stability (Retained Strength) ASTM D 4355 50% after 500 hours of exposure aBased on grain size analysis of in situ soil in accordance with AASHTO T 88. bThese default filtration property values are based on predomina nt particle sizes of the in-situ soils. In addition to the default permittivity value, the Resident may re quire geotextile permeability and/or performance testing based on engineering design for drainage sy stems in problematic soil environments. cSite specific geotextile design should be performed especially if one or more of the following problematic soil environments are encountered: unstable or highly erodable soils such as non-cohesive silts; gap graded soils; alternating sand/silt laminated soils; dispersive clays; and/or rock flour. dFor cohesive soils with a plasticity index greater than 7, geot extile maximum average roll value for apparent opening size is 0.30mm.