Evaluation of Fly Ash in Portland Cement Concrete Paving in Woodbury County, Iowa, HR-201, Construction Report, 1979

(1979) Evaluation of Fly Ash in Portland Cement Concrete Paving in Woodbury County, Iowa, HR-201, Construction Report, 1979. Transportation, Department of

pdf
Preview
PDF
IADOT_hr201construction_Evaluation_Fly_Ash_PCC_Pav_Woodbury_Cnty_IA_1979.pdf

File Size:1MB

Abstract

The earliest overall comprehensive work on the use of fly ash in concrete was reported by Davis and Associates of the University of California in 1937. Since that time there have been numerous applications of the use and varying proportions of fly ash in portland cement concrete mixes. Fly ash is a pozzolanic powdery by-product of the coal combustion process which is recovered from flue gases and is generally associated with electric power generating plants. Environmental regulations enacted in recent years have required that fly ash be removed from the flue gases to maintain clean air standards. This has resulted in an increased volume of high quality fly ash that is considered a waste product or a by-product that can be utilized in products such as portland cement concrete. There are several sources of the high quality fly ash located in Iowa currently producing a combined total of 281,000 tons of material annually. Due to recent cement shortages and the rapidly increasing highway construction costs, the Iowa Department of Transportation has become interested in utilizing fly ash in portland cement concrete paving mixes. A preliminary review of the Iowa Department of Transportation Materials Laboratory study indicates that a substitution of fly ash for portland cement, within limits, is ·not detrimental to the overall concrete quality. Also the use of fly ash in concrete would reduce the cement consumption as well as provide a potential cost savings in areas where high quality fly ash is available without excessive transportation costs. The previously expressed concerns have shown the need for a research project to develop our knowledge of fly ash replacement in the Iowa Department of Transportation portland cement concrete paving mixes.

Item Type: Departmental Report
Keywords: Concrete mixing, Concrete placing, Fly ash, Mixing, Procedures, Shipping, Storage facilities
Subjects: Transportation > Pavements
Transportation > Pavements > Concrete
Transportation
Transportation > Materials
Transportation > Research
ID Code: 17028
Deposited By: Iowa DOT Library
Deposited On: 03 Jun 2014 16:05
Last Modified: 06 Jan 2015 16:18
URI: http://publications.iowa.gov/id/eprint/17028