Background
Texas uses a number of different asphalt concrete mixtures for the construction of asphalt roads.
These vary depending on whether the mixture will be used as a surfacing, intermediate or base course layer. The tables below show the different asphalt concrete mixtures included in TxDOT specifications together with recommended minimum and maximum layer thicknesses in inches.
Asphalt surfacing mixtures used in Texas
| Asphalt mixture | TxDOT Item | Min. thick. (in.) | Max. thick. (in.) |
| Type C | 340/1 | 2 | 4 |
| Type D | 340/1 | 1.5 | 3 |
| Type F | 340/1 | 1.25 | 2.5 |
| PFC | 342 | 0.75 | 1.5 |
| Superpave Type C | 344 | 1.5 | 3 |
| Superpave Type D | 344 | 1.25 | 2 |
| CMHB Type C | 344 | 2 | 4 |
| CMHB Type F | 344 | 1.5 | 3 |
| SMA Type C | 346 | 2.25 | 4 |
| SMA Type D | 346 | 1.5 | 3 |
| SMA Type F | 346 | 1.25 | 2.5 |
Asphalt intermediate layer mixtures used in Texas
| Asphalt mixture | TxDOT Item | Min. thick. (in.) | Max. thick. (in.) |
| Type B | 340/1 | 2.5 | 5 |
| Type c | 340/1 | 2 | 4 |
| Superpave Type B | 344 | 2.25 | 4 |
| Superpave Type C | 344 | 1.5 | 3 |
| CMHB Type C | 344 | 2 | 4 |
| SMA Type C | 346 | 2.25 | 4 |
| SMA Type D | 346 | 1.5 | 3 |
Notes Porous Friction course (PFC) mixtures can either constitute PG-76 or Asphalt Rubber mixtures. Coarse Matrix High Binder mixtures. Stone Matrix Asphalt Type C and Type F mixtures can constitute Asphalt Rubber binders.
Read more about this topic: Tex Sys
Famous quotes containing the word background:
“They were more than hostile. In the first place, I was a south Georgian and I was looked upon as a fiscal conservative, and the Atlanta newspapers quite erroneously, because they didn’t know anything about me or my background here in Plains, decided that I was also a racial conservative.”
—Jimmy Carter (James Earl Carter, Jr.)
“I had many problems in my conduct of the office being contrasted with President Kennedy’s conduct in the office, with my manner of dealing with things and his manner, with my accent and his accent, with my background and his background. He was a great public hero, and anything I did that someone didn’t approve of, they would always feel that President Kennedy wouldn’t have done that.”
—Lyndon Baines Johnson (1908–1973)
“... every experience in life enriches one’s background and should teach valuable lessons.”
—Mary Barnett Gilson (1877–?)