Optimization of the Physical and Compositional Characteristics of Fly Ash Cementfor the Production of Sulfate Resistant Concrete

摘要

The utilization of fly ash in concrete is advantageous for several reasons,including: (1) reduced need for the disposal of fly ash; (2) reduced cost of concrete; and (3) improved physical and mechanical properties of concrete. Improvements in the properties of concrete include improved workability, decreased temperature rise, increased long-term strength, and decreased long-term permeability. Unfortunately, fly ash has variable effects on the sulfate resistance of concrete. Uncertainties concerning these effects have often limited its use. The report describes a study in which researchers investigated the relationship between the composition of fly ash and the effects of fly ash on the sulfate resistance of concrete. Both the chemical and mineralogical compositions of fly ash were considered. The study also included an investigation of the production of sulfate resistant concrete containing non-sulfate resistant fly ash. The purpose of this portion of the study was to facilitate the utilization of fly ash from Texas.