Effect of high tensile strength polypropylene chopped fiber reinforcements on the mechanical properties of sodium based geopolymer composites

Daniel R. Lowry, Waltraud M. Kriven

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The geopolymer matrix is ideal for incorporating a variety of reinforcements for structural applications. In the case of this experiment, the reinforcements are high tensile strength polypropylene (PP) chopped fibers of lengths of 0.5″, 1″, and 2″. The fibers were added in increments of 0.92, 1.01, 1.32, and 2.48 weight percents. These samples were then tested in a three point bending apparatus at a loading rate of 176 Newtons per minute. The maximum stress for each sample was then compared to that of the pure, nonreinforced, sodium geopolymer matrix. The samples prepared using the 0.5″ fibers achieved average maximum stresses of 9.9±0.5, 9.0±1.3, 9.9±3.0, and 15.1±1.5 MPa, respectively for increasing weight percent of fibers. Samples prepared using the 1″ fibers had average maximum stresses of 9.6±3.8, 10.5±1.6, 12.4±1.34, and 14.4±1.0 MPa with respect to increasing fiber contents. The samples prepared with the 2″ fibers had average maximum stresses of 9.0±0.9, 11.2±1.4, 13.5±1.7, and 18.3±0.8 MPa with respective increasing fiber composition. This data was compared to the average maximum stress achieved by the pure sodium geopolymer (NaGP) of 1.8±0.5 MPa. From this data Weibull statistics were calculated to determine the mechanical reliability of the material. According to the Weibull statistics for each fiber length used, the 0.92, 1.01, and 2.48 weight percent samples produced the most reliable data, where the 1.32 weight percent samples produced data that was reasonably reliable, while the pure geopolymer samples did not produce reliable data.

Original languageEnglish (US)
Title of host publicationStrategic Materials and Computational Design - A Collection of Papers Presented at the 34th International Conference on Advanced Ceramics and Composites
PublisherAmerican Ceramic Society
Number of pages10
ISBN (Print)9780470921913
StatePublished - 2010

Publication series

NameCeramic Engineering and Science Proceedings
ISSN (Print)0196-6219

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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