Development and freeze-thaw durability of high flyash-content concrete

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:7042542

Sajadi, J

Objectives were to investigate the effects on concrete strength, drying shrinkage, freeze-thaw durability, and air-void system parameters of replacing various amounts of portland cement with different types of fly ash and to compare selected characteristics of such fly-ash concretes and fly-ash concretes containing a high-range water-reducing admixture to those of a control mixture. It was concluded that concrete mixtures with 90-day compressive strengths equal to the control could be produced when large amounts of cement were replaced by fly ash. In addition, when the high-range water-reducing admixtures was employed, very large amounts of cement could be replaced by fly ash to yield mixtures whose compressive strengths were equal to or greater than the strengths of the control mix at all ages. The maximum amount of cement that could be replaced for equal-strength mixtures depended upon the nature of the fly ash. Drying shrinkage of plain fly-ash concretes and fly-ash concretes containing the high-range water-reducing admixture were similar to those of the control mix. The optimum fly-ash content in a concrete is comparable in strength and durability to a conventional (control) concrete was influenced by the chemical and physical characteristics of the fly ash.

• Research Organization: West Virginia Univ., Morgantown (USA)
• OSTI ID: 7042542
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
36 MATERIALS SCIENCE
360603 -- Materials-- Properties
AEROSOL WASTES
ASHES
BUILDING MATERIALS
CONCRETES
FLY ASH
MATERIALS
OPTIMIZATION
PAVEMENTS
RELIABILITY
RESIDUES
WASTE PRODUCT UTILIZATION
WASTES