Ad
related to: international roughness index scale pdf file size adobe
Search results
Results From The WOW.Com Content Network
The roughness scale that was defined and tested was eventually named the International Roughness Index. [8] The IRI is used in managing pavement assets, as well as sometimes in evaluating new construction to determine bonus/penalty payments for contractors or for identifying specific locations where repairs or improvements (e.g., grinding or ...
Original file (1,239 × 1,752 pixels, file size: 803 KB, MIME type: application/pdf) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
Pavement performance models could be developed to predict a single distress such as a crack or the aggregate pavement condition index. Schematic deterioration of the condition of a road over time The increase in the IRI of a road in Texas. The blue dots on the curve represent maintenance actions.
The present serviceability index (PSI) is a pavement performance measure.Introduced by the American Association of State Highway and Transportation Officials (AASHTO), the PSI is one of the most widely used pavement performance indicators after pavement condition index (PCI) and international roughness index (IRI).
The pavement condition index (PCI) is a numerical index between 0 and 100, which is used to indicate the general condition of a pavement section.The PCI is widely used in transportation civil engineering [1] and asset management, and many municipalities use it to measure the performance of their road infrastructure and their levels of service. [2]
As an approximation, the roughness length is approximately one-tenth of the height of the surface roughness elements. For example, short grass of height 0.01 meters has a roughness length of approximately 0.001 meters. Surfaces are rougher if they have more protrusions. Forests have much larger roughness lengths than tundra, for example.
The top image shows asperities under no load. The bottom image depicts the same surface after applying a load. In materials science, asperity, defined as "unevenness of surface, roughness, ruggedness" (from the Latin asper—"rough" [1]), has implications (for example) in physics and seismology.
Original file (1,275 × 1,650 pixels, file size: 499 KB, MIME type: application/pdf, 8 pages) This is a file from the Wikimedia Commons . Information from its description page there is shown below.