High content of fly ash (class F) in extruded cementitious composites

Alva Peled, Michèle F. Cyr, Surendra P. Shah

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

This paper presents mechanical properties and durability of extruded fiber-reinforced cement composites that contain a high percentage of Class F fly ash. The fly ash was examined as a replacement for cement in a plain cement matrix and composites containing polyvinyl alcohol (PVA), glass, acrylic (PAN), polypropylene (PP), or cellulose fibers. Accelerated aging was used to study the effect of fly ash on the durability of the different systems. It is shown that fly ash improves the flexural performance of the extruded composite. Tlie extent of this improvement varies with fiber type. PAN, glass, and cellulose fibers were most affected by the use of fly ash. TJie greatest improvement in both flexural strength and ductility was obtained for 28-day moist-cured composites containing PAN fibers when as much as 70%, by volume, of the cement was replaced with fly ash. In this case, a five-fold increase in toughness and an approximately 20% improvement in strength were observed for steam-cured composites.

Original languageEnglish (US)
Pages (from-to)509-517
Number of pages9
JournalACI Structural Journal
Volume97
Issue number5
StatePublished - Dec 1 2000

Keywords

  • Durability
  • Fly ash
  • Rheology

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

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