Effect of microbes addition on the properties and surface morphology of fly ash-based geopolymer paste

Kiki Dwi Wulandari, Januarti Jaya Ekaputri, Triwulan, Setyo Budi Kurniawan, Widya Emilia Primaningtyas, Siti Rozaimah Sheikh Abdullah, Nur ‘Izzati Ismail, Muhammad Fauzul Imron

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

This present study analyzed the effect of Rhizopus oligosporus and Sporosarcina pasteurii addition on the properties and surface morphology of fly ash-based geopolymer paste mixtures as a green sustainable material. The addition of bottom ash and a foaming agent were also conducted to improve the paste quality. Compressive strength, porosity, X-Ray Diffractometry (XRD) and Scanning Electron Microscopy (SEM) tests were performed sequentially. The addition of microbes can improve the compressive strength of specimens by up to 43.75%. All microbe-added specimens exhibited a higher amount of closed porosity compared to the non-microbe-added specimens which also responsible to the higher compressive strength. The addition of foaming agent and bottom ash to the mixtures showed a negative effect to the inoculated microbes. SEM analysis showed the initial result of the potential of R. oligosporus and S. pasteurii as a self-healing agent for fly ash-based geopolymer pastes.

Original languageEnglish
Article number101596
JournalJournal of Building Engineering
Volume33
DOIs
Publication statusPublished - Jan 2021

Keywords

  • Mechanical properties
  • Physical properties
  • Rhizopus oligosporus
  • Self-healing
  • Sporosarcina pasteurii

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