AASHTO PP 81:18 (2020) Standard Practice for Intelligent Compaction Technology for Embankment and Asphalt Pavement Applications

AASHTO PP 81:18 (2020) Standard Practice for Intelligent Compaction Technology for Embankment and Asphalt Pavement Applications. This work shall consist of compaction of roadway embankment, or asphalt pavement, or both, using Intelligent Compaction (IC) rollers within the limits of the work described in the plans or provisions. IC is defined as a process that uses rollers equipped with a measurement-documentation system that automatically records compaction parameters (e.g.. spatial location, stiffness, temperature. pass count, vibration amplitude, and frequency) in real-time during the compaction process. IC rollers equipped with accelerometers use roller vibration measurements to assess mechanistic material properties and to ensure that optimum compaction and uniformity is achieved through continuous monitoring of operations. The contractor shall supply sufficient numbers of rollers, and other associated equipment. necessary to complete the compaction requirements for the specific materials. This specification is to he applied during the contractor’s quality control. All tasks are the contractor’s responsibility, unless designated otherwise within this provision. 3.1.3. coordinate system—a system that uses one or more numbers or coordinates to uniquely determine C the position of a point or other geometric element on a manifold such as Euclidean space. 3.1.3.1. geodetic coordinates—a non-earth-centric coordinate system used to describe a position in longitude, latitude, and altitude above the imaginary ellipsoid surface based on a specific geodetic datum. WGS84 and NAD83 datum are required for use with Universal Transverse Mercator (UTM) and State Plane, respectively. 3.1 .3.2. slate plane coordinates—a set of 126 geographic zones or coordinate systems designed for specific regions of the United States. Each state contains one or more state plane zones, the boundaries of which usually follow county lines. There are 110 zones in the continental United States, with 10 more in Alaska, 5 in Hawaii, and I for Puerto Rico and the U.S. Virgin Islands. The system is widely used for geographic data by state and local governments because it uses a Cartesian coordinate system to specify locations rather than a spherical coordinate system. By ignoring the curvature of the earth, “plane surveying” methods can be used, speeding up and simplifying calculations. Additionally, the system is highly accurate within each zone (error less than I : l0,000). Outside a specific state plane zone, accuracy rapidly declines, thus the system is not useful for regional or national mapping. The current state plane coordinates are based on NAD83. Issues may arise when a project crosses state plane boundaries. 3.1...