THE EFFECTS OF BOTTOM ASH UPON BITUMINOUS SAND MIXTURES
The growing depletion of high quality aggregate sources for use in highway construction necessitates the discovery either of new materials, or of methods to utilize marginal materials. Bottom ash from coal burning power plants is abundant and offers properties lacking in conventional road aggregates. The vast differences in boilers, coal supplies, and combustion techniques lead to many varieties of ash by- products. Wide use of ash as an aggregate substitute has faltered due to a lack of definitive design parameters. A laboratory study conducted on six bottom ash sources obtained throughout the state of Indiana attempted to physically characterize the materials. Mixtures of river sand, limestone, and two of the six sources of bottom ash were evaluated to determine the effect the ash and upon the performance of the mineral aggregates when incorporated in a bituminous paving misture. The presence of two characteristics ash classes were developed. The first did little to improve the skid resistance or the structural stability. The second class improved skid resistance but did not improve the skid resistance of the structural stability. The second class improved skid resistance but did not improve stability. Both classes of ash aided the mixtures in maintaining Marshall Stabilities when tested in the saturated condition. The results of these tests provide information necessary for judging the suitability of paving mixtures containing bottom ash.
Purdue University/Indiana Department of Transportation JHRPPurdue University, School of Civil Engineering
West Lafayette, IN USA 47907-1284
- SHULER, T S
- Publication Date: 1976-3-16
- Features: Appendices; Figures; References; Tables;
- Pagination: 120 p.
- TRT Terms: Aggregates by source; Bituminous materials; Bottom ash; Limestone; Marshall test; Road construction; Sand; Skid resistance
- Uncontrolled Terms: Aggregate sources; Structural stability
- Old TRIS Terms: Marshall stability marshall stability & flow test flow
- Subject Areas: Highways; Materials;
- Accession Number: 00141354
- Record Type: Publication
- Report/Paper Numbers: JHRP-76-11 Final Rpt.
- Files: TRIS
- Created Date: Dec 22 1976 12:00AM