Factors affecting the microbial deterioration of asphalt overlays
Title:
Factors affecting the microbial deterioration of asphalt overlays
Author:
Brown, Lewis R.
Personal Author:
Publication Information:
Jackson, Miss. : Mississippi State Highway Dept., [1986]
Physical Description:
38 leaves ; 28 cm
General Note:
In cooperation with the Federal Highway Administration.
"January 9, 1986."
Contents:
Introduction -- Materials and methods -- Results -- Summary and conclusions -- Bibliography.
Abstract:
The objectives of this investigation were to study the factors contributing to the blistering of asphalt overlays on highways in Mississippi and determine if the problem can be prevented or the damage minimized. Gas chromatographic analyses of samples taken from blisters revealed the presence of CH4 and large amounts of CO2. Microbial populations in the degraded materials ranged from 1,000 to 10,000 organisms/gram. Chemical analyses of the sand and gravel materials used in the asphalt highway mixes, and the soils native to these areas experiencing problems, revealed the presence of both inorganic nitrogen and inorganic phosphorus. Using a microbial bioassay technique it was shown that sufficient nitrogen and phosphorus were available in these materials to support microbial growth and gas production.
Added Author: