The effect of fly ash on the sulfate resistance of concrete

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:6202996

Tikalsky, P J

The durability of concrete is determined by its ability to endure the physical and environmental surroundings without losing the functional properties and structural integrity of the original design. Concrete containing fly ash can be proportioned to meet the durability requirements of a wide range of applications, such as concrete for mass structures, pavements, structural members, and high strength applications. One area where the long term performance of concrete containing fly ash is not clearly understood is in sulfate environments. The sulfate attack mechanism in concrete containing fly ash has been related in recent years to the mineralogical and chemical composition of the cementitious and pozzolanic material. This study investigated the interrelationship between the physical, mineralogical and chemical characteristics of portland cement, fly ash, and their proportions, and the sulfate resistance of concrete containing fly ash. Eighteen fly ashes and five portland cements have been studied at four levels of volumetric replacement of fly ash for portland cement. Other variables studied were workability, air content, curing conditions, and permeability. The fly ashes were characterized by performing chemical, physical and mineralogical analyzes. Over 700 specimens were submerged in a 10 percent sodium sulfate solution. The specimens were measured for expansion, mass change, and cracking. The study has revealed a strong correlation between the glassy composition of fly ash and the sulfate resistance of concrete.

• Research Organization: Texas Univ., Austin, TX (USA)
• OSTI ID: 6202996
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
36 MATERIALS SCIENCE
360604 -- Materials-- Corrosion
Erosion
& Degradation
AEROSOL WASTES
AIR
ALKALI METAL COMPOUNDS
ASHES
BUILDING MATERIALS
CARBONACEOUS MATERIALS
CEMENTS
CHEMICAL COMPOSITION
CHEMICAL PROPERTIES
CHEMICAL REACTIONS
COAL
COMBUSTION
CONCRETES
CORRELATIONS
CORROSIVE EFFECTS
CRACKS
CURING
ENERGY SOURCES
EXPANSION
FLUIDS
FLY ASH
FOSSIL FUELS
FUELS
GASES
MATERIALS
MECHANICAL PROPERTIES
MINERALOGY
OXIDATION
OXYGEN COMPOUNDS
PERMEABILITY
PHYSICAL PROPERTIES
PORTLAND CEMENT
QUANTITY RATIO
RESIDUES
SODIUM COMPOUNDS
SODIUM SULFATES
SULFATES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
WASTE PRODUCT UTILIZATION
WASTES
WEAR RESISTANCE