In an asphalt pavement, longitudinal joints occur where one
paving lane (also called a “mat”) is placed adjacent to an earlier placed
paving lane. The localized area of the longitudinal joint is more difficult to
compact and, as a result, has higher in-place air voids compared to the
interior of the mat. While in-place void levels at the interior of the mat are
typically 6-8 percent (92-94 percent compaction), void levels at the joint can
be 10 percent or greater.
Based on positive responses from past events, a third
International and Western States In-Place Recycling Conference was held in
conjunction with the Rocky Mountain Asphalt User/Producer Group’s Annual
Meeting in the fall of 2018.
One of the presentations at this event was made by James
Gallegos, New Mexico Department of Transportation (NMDOT) Materials Engineer,
on a cold in-place recycling (referred to as cold in-situ recycling in New
Mexico) project on U.S. Highway 285 in southeast New Mexico. This project is an
example of the information from those past conferences reaching the project