The influence of Si:Al and Na:Al on the physical and microstructure characters of geopolymers based on metakaolin

Subaer*, Abdul Haris, Nurhayati, Andi Irhamsyah, Januarti Jaya Ekaputri

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

30 Citations (Scopus)


A research has been conducted to investigate the physico-mechanical and microstructure properties of geopolymers synthesised from metakaolin activated with sodium silicate solution. A wide range of physical and mechanical properties of geopolymers were studied such as bulk density, porosity, Vickers hardness, compressive strength, thermal expansion and thermal conductivity. It was found that these properties were directly related to geopolymers process variables such as Si:Al, Na:Al, Na2O:H2O, time and curing temperature. The structure of the resulting geopolymers was studied by using X-Ray diffraction (XRD) and the microstructure of geopolymers paste and the interfacial transition zone (ITZ) between the aggregate and the matrix of geopolymer were studied by using Transmission Electron Microscope (TEM) and Scanning Electron Microscope (SEM). The results gave a new insight into the composition-microstructure-property relationship of geopolymers and paving the way to the production of geopolymers with improved performance in a variety of applications.

Original languageEnglish
Title of host publicationProperties and Application of Geopolymers
EditorsJanuarti Jaya Ekaputri, Januarti Jaya Ekaputri, Antoni Antoni
PublisherTrans Tech Publications Ltd
Number of pages8
ISBN (Print)9783038355441
Publication statusPublished - 2016
Event2nd Malaysia-Indonesia Geopolymer Symposium, 2015 - Surabaya, Indonesia
Duration: 25 Oct 201527 Oct 2015

Publication series

NameMaterials Science Forum
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


Conference2nd Malaysia-Indonesia Geopolymer Symposium, 2015


  • Geopolymers
  • Metakaolin
  • Microstructure characters
  • Physical properties


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