Flyash pavements, runways to take off

Journal Article · Fri Aug 01 00:00:00 EDT 1975 · Civ. Eng. (N.Y.); (United States)

OSTI ID:7266354

Fairweather, V

Fly ash, waste from coal-burning power plants, is being used increasingly in pavements; energy, labor, and material savings make the method attractive. Recycling waste materials is a bonus. Fly-ash lime mix sets up much more slowly and its set-up time varies more than conventional concrete, but this can be an advantage since a new mix is not required for touch-up work and requires fewer man hours. It is cooler than conventional mixes which reduces shrinkage. An asphalt overlay is always required but fly-ash cement as a base course is much more economical than concrete. Significant cost savings were realized in paving a new container terminal storage yard in Portland, Oregon. A computer analysis showed that a multi-layer pavement would be best, with each level having a diminishing modulus of elasticity, the lowest being closest to the subgrade modulus. This technique minimizes stress in each layer. More economical materials may be used in the lower layers. At Portland, 3 layers were composed of lime-fly ash-cement and the uppermost layer, thin asphaltic concrete.

• OSTI ID: 7266354
• Journal Information: Civ. Eng. (N.Y.); (United States), Vol. 45:8
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CONCRETES
FLY ASH
RECYCLING
ROADS
BUILDING MATERIALS
COAL
COMPARATIVE EVALUATIONS
ECONOMICS
POWER PLANTS
STRESSES
WASTE MANAGEMENT
WORK
AEROSOL WASTES
CARBONACEOUS MATERIALS
ENERGY SOURCES
FOSSIL FUELS
FUELS
MANAGEMENT
MATERIALS
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
200200 - Fossil-Fueled Power Plants- Waste Management
320305 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management