Title: Performance of a Mexican ASTM Class F Fly Ash in Studies Dealing with Concrete Durability

Author(s): R.E. Rodriguez Camacho, B. Martinez Sanchez, J.J. Flores Martinez, R.U. Afif, and H.J. Montano Roman

Publication: Symposium Paper

Volume: 242

Issue:

Appears on pages(s): 463-480

Keywords: acid resistance; alkali-silica reaction (ASR); chloride diffusion; Class F fly ash (FA); durability; permeability; pozzolanic activity reaction; supplementary cementitious material

DOI: 10.14359/18734

Date: 4/1/2007

Abstract:
The purpose of this study was to examine the effect of a Class F fly ash on mechanical and durability properties of concrete. The fly ash used in this study, from a Mexican source, was characterized by chemical and mineralogical analysis, and by its pozzolanic activity. Concrete mixtures were prepared with 20, 25, and 30% fly ash by mass of total cementitious material. Concrete specimens were cast and tested to determine the durability of fly ash concrete; the tests used included water, rapid chloride permeability tests (RCPT), migration test, acid resistance and abrasion resistance tests. Also the compressive strength was determined. Mortar specimens were used to evaluate sulfate resistance and alkali-silica reaction. The results of this study confirmed that the Mexican Class F fly ash was suitable in improving the durability characteristics of concrete when used at 25% or higher dosage of cement replacement.