Influence of Cement Type on Fiber-Matrix Interface Bond Strength

Robert B. Jewell, Kamyar C. Mahboub, Thomas L. Robl, Constance L. Wood

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents the results of an experimental investigation on the interface bond strength between reinforcing fibers embedded in a calcium sulfoaluminate (CSA) cement matrix, utilizing the single-fiber pullout test. Bonding at the fiber-matrix interface plays an important role in controlling the mechanical performance of cementitious composites. To examine the fiber-matrix bond within the CSA and portland cement system, fibers with differing elastic modulus strengths were selected, including polyvinyl-alcohol (PVA), polypropylene, coated steel, and plain steel. The fibers were embedded in three different matrices: two sulfate-based cements including a commercially available CSA cement and a CSA cement fabricated from coal-combustion byproducts. The third matrix was a silicate-based ordinary portland cement. In this study, the single-fiber pullout test was employed to examine the fiber-matrix interface and the effect of cement type on interfacial bond strength. Experiments show the more rigid-dense morphology of the CSA cement paste related to the ettringite crystal structure yielded higher shear-bond strengths for both steel and synthetic fibers. Results suggest the primary way to increase the effectiveness of reinforcing fibers is to decrease the modulus of elasticity ratio of fiber to matrix.

Original languageEnglish
Article number04022003
JournalJournal of Materials in Civil Engineering
Volume34
Issue number4
DOIs
StatePublished - Apr 1 2022

Bibliographical note

Funding Information:
The work reported in this study was supported by the University of Kentucky Center for Applied Energy Research and the National Institute for Hometown Security.

Publisher Copyright:
© 2022 American Society of Civil Engineers.

Keywords

  • Calcium sulfoaluminate (CSA) cement
  • Interfacial bond
  • Low-energy cement
  • Shear stress
  • Single-fiber pullout

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science (all)
  • Mechanics of Materials

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