Mechanical evaluation of Na-based strain-hardening geopolymer composites (SHGC) reinforced with PVA, UHMWPE, and PBO fibers

Research output: Contribution to book/conference proceedings/anthology/reportChapter in book/anthology/reportContributedpeer-review



Strain-hardening geopolymer composites (SHGC) show increased deformation capacity due to a multiple cracking tolerance under tensile loading. To evaluate their mechanical performance, a common metakaolin-based mixture was produced. Three types of short fibers were evaluated as disperse reinforcement: polyvinyl alcohol (PVA), ultra-high molecular weight polyethylene (UHMWPE), and poly(p-phenylen-2,6-benzobisoxazole) (PBO). The composites’ mechanical features were analyzed in compression, three-point-bending, and tension tests with subsequent Environmental Scanning Electron Microscopy (ESEM) analysis of the fracture surfaces. Digital Image Correlation (DIC) was used to evaluate the extent of multiple cracking and crack widths under uniaxial tension. Additionally, single-fiber pullout tests were performed. PBO-based composites yielded the highest mechanical properties, reaching a 4.8 MPa peak stress in tension at a strain level of 2.3%, with a larger number of cracks. PVA and UHMWPE-based materials, however, demonstrated a lower mechanical performance, because of their larger diameter, lower mechanical properties and fiber-matrix adhesion.


Original languageEnglish
Title of host publicationFibre reinforced concrete: Improvements and innovations II
EditorsPedro Serna, Aitor Llane-Torre, José R. Martí-Vargas, Juan Navarro-Gregori
PublisherSpringer Verlag
Number of pages11
Publication statusPublished - 5 Sept 2021

Publication series

SeriesRILEM Bookseries

External IDs

unpaywall 10.1007/978-3-030-83719-8_73
Mendeley 1a80e460-a891-373f-a3aa-d761864344bc


Research priority areas of TU Dresden

DFG Classification of Subject Areas according to Review Boards

Subject groups, research areas, subject areas according to Destatis


  • Geopolymer, PBO, PE, PVA, SHGC