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Hveem and Carmany [1948] found the term 6 log EWL could replace in their thickness design equation.
Table 1 provides an overview of a few of the flexible pavement design procedures available in 1949 [Gray, 1949]. One can quickly observe that these are mostly empirical relationships, many of which were influenced by the Boussinesq theory of load distribution (such as North Dakota ).
The advancement of asphalt technology lead to the formation of The National Bituminous Concrete Association in 1955.
A variety of equivalency factors can be used depending on the pavement section which is defined by a Structural Number and the terminal serviceability index (for flexible pavements). The basic equation used for calculating AASHTO equivalency factors [after AASHTO, 1981]:
From a Goodyear publication, the following quote may be of interest [1985]:Wheels continued to evolve.
That fact became extremely clear in 2005 when the Federal Highway Administration reported that 2,601,490 miles of American roadways were paved with some variety of asphalt.
05/19/2022 - Roofing manufacturers adopt aggressive recycling goal
05/09/2022 - The art of bringing asphalt to life
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| Company name | Founded date | Revenue | Employee size | Job openings |
|---|---|---|---|---|
| Unique Paving Materials | - | $13.6M | 20 | - |
| S T Bunn Construction Co. | 1939 | $83.8M | 150 | - |
| Central Plumbing | 1946 | $8.5M | 90 | 7 |
| Fisher Industries | 1952 | $730.0M | 3,000 | 123 |
| B.R. Kreider & Son | 1936 | $530,000 | 10 | - |
| American Asphalt | 1903 | $6.4M | 50 | - |
| Reed Contracting Services | 1987 | $27.0M | 200 | - |
| Pulice Construction | 1956 | $172.3M | 14 | - |
| Ajax Paving Industries of Florida | 1951 | $240.0M | 950 | - |
| Rummel Construction | 1996 | $107.8M | 200 | - |
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