D8096/d8096m (version 25)
1.1 These test methods are index test methods to determine the nominal diameter, nominal length, and density of a sediment retention fiber roll (SRFR) before installation.
1.2 Logistical and installation processes may make field measurements different than quality control measurements (Note 1).
Note 1: The extent of logistical deformation is not fully understood. The values produced from this test method are of a laboratory setting at the time of manufacturing; thus, they do not account for transformations that may be experienced during the logistical process of delivering product. Logistics may affect index properties such as nominal diameter being reduced because of compression of materials during packaging and shipping.
1.3 Two methods for measuring the nominal diameter and nominal length of a SRFR are provided. One method is provided for determining the density of a SRFR at ambient conditions. Requirement to complete both methods shall be specified by the requesting authority, but Method A shall be required every time for all materials that are compressed for shipping purposes. Both methods are to be completed when no method is specified.
1.3.1 Method A evaluates the material at near saturated conditions by completely submerging the specimens in water to provide conditions similar to those the material would be exposed to during a rainfall event in the field. It is important to know how materials rebound when wetted after shipment, because the resulting values are the index properties the material would have after it was exposed to rainfall, but before concentrated flows encountered it in the field.
1.3.2 Method B evaluates the material at ambient conditions.
1.4 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.
1.4.1 The gravitational system of inch-pound units is used when dealing with inch-pound units. In the system, the pound (lbf) represents a unit of force (weight), while the units for mass is slugs. The slug unit is not given, unless dynamic (F = ma) calculations are involved.
1.4.2 It is common practice in the engineering/construction profession to concurrently use pounds to represent both a unit of mass (lbm) and of force (lbf). This practice implicitly combines two separate systems of units; the absolute and the gravitational systems. It is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single standard. As stated, this standard includes the gravitational system of inch-pound units and does not use/present the slug unit of mass. However, the use of balances and scales recording pounds of mass (lbm) or recording density in lbm/ft3 shall not be regarded as nonconformance with this standard.
1.4.3 The terms density and unit weight are often used interchangeably. Density is mass per unit volume, whereas unit weight is force per unit volume. In this standard, density is given only in SI units. After the density has been determined, the unit weight is calculated in SI or inch pound units, or both.
1.5 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.
1.5.1 For purposes of comparing a measured or calculated value(s) with specified limits, the measured or calculated value(s) shall be rounded to the nearest decimal of significant digits in the specified limit.
1.5.2 The procedures used to specify how data are collected/recorded or calculated in the standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.