Experimental study on the interface properties of PVA fibers in slag/fly ash based geopolymer pastes

Shizhe Zhang, Bahman Ghiassi, Guang Ye

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review


Bonding strength between fiber and matrix is a crucial factor which can largely determine the performance of fiber reinforced geopolymer composite. However, the available information on the fiber/matrix interface properties in s lag/fly ash based geopolymer is still quite limited, which have hindered the scientific design of related fiber reinforced composites. This study presents the bonding characteristics of PVA fiber/slag-fly ash based geopolymer matrix interface determined by single fiber pullout tests. Four SiO2/Na2O ratios (0.8, 1.0, 1.2 and 1.5) within the alkaline activator were used for mixture preparation. All specimens were tested after 28-day curing. The interface characteristics including chemical bonding energy, interfacial frictional force as well as the slip-hardening properties were determined from the fiber pullout tests. It was found that the chemical bonding energy first increased and then decreased with increment of SiO2/Na2O ratio, indicating an optimal alkaline activation condition at SiO2/Na2O ratio of 1.0-1.2. On the other hand, the interfacial frictional force and slip-hardening properties seems to be not influenced by increasing the SiO2/Na2O ratio. This research provides a fundamental understanding into the interfacial bonding properties of PVA fiber to the slag-fly ash based geopolymer matrices.
Original languageEnglish
Title of host publication4th International Conference on Service Life Design for Infrastructures
Subtitle of host publication(SLD4) 27-30 August 2018 – Delft, Netherlands
EditorsGuang Ye, Yong Yuan, Claudia Romero Rodriguez, Hongzhi Zhang, Branko Šavija
ISBN (Electronic)978-2-35158-213-8
Publication statusPublished - 2018
Event4th International Conference on Service
Life Design for Infrastructures
- Delft, Netherlands
Duration: 27 Aug 201830 Aug 2018
Conference number: 4

Publication series

NameRilem proceedings
NumberPRO 125


Conference4th International Conference on Service
Life Design for Infrastructures
Abbreviated titleSLD4


  • Efflorescence
  • cement-based exterior wall
  • mitigation
  • metakaolin

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