USE OF FLY ASH IN CONCRETE BY STATE TRANSPORTATION AND HIGHWAY DEPARTMENTS
Fifty-nine agencies responded to a questionnaire on use of fly ash and/or Type IP blended cement in concrete. These included all of the state highway and transportation departments, the District of Columbia, three Canadian provinces and five federal agencies. Twenty-four agencies made no use of either substance in concrete. The others did permit the use of either one or both, usually at the option of the contractor. However, only four states had placed more than 100 lane-miles of fly ash concrete, and only two had placed more than 100 lane-miles of blended cement concrete. This lack of widespread usage may be due to a lack of economic incentives. The initial capital investment for the required separate silos or storage bins, as well as the increased quality control testing, deters small contractors from using fly ash. Blended concrete is not attractive, since it usually costs the same as the more familiar regular portland cement. Those states using either or both report satisfactory performance, with the primary control problem being assuring the proper amount of entrained air.
- Record URL:
Virginia Highway and Transportation Research CouncilCharlottesville, VA United States
- Halstead, W J
- Publication Date: 1980-5
- Features: Appendices; Tables;
- Pagination: 21 p.
- TRT Terms: Admixtures; Blends; Costs; Data collection; Fly ash; Questionnaires; Surveys; Utilization
- Subject Areas: Finance; Highways; Materials; Research;
- Accession Number: 00316474
- Record Type: Publication
- Report/Paper Numbers: VHTRC 80-R46
- Files: NTL, TRIS, STATEDOT
- Created Date: Oct 8 1980 12:00AM