The influence of alkali activator concentration to mechanical properties of geopolymer concrete with trass as a filler

Puput Risdanareni, Januarti Jaya Ekaputri, Triwulan

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

32 Citations (Scopus)


This paper describes one of the varying factors influencing the mechanical properties of geopolymer concrete. Fly ash and volcanic material called trass was used as raw materials, while sodium Hydroxide (NaOH) and Sodium silicate (Na2SiO3) was applied as an alkali activator. Mechanical properties were assessed by compressive test, the concentration of NaOH used in this study was eight and ten Molars, and ratio of Na2SiO3 to NaOH by mass was 0. 5, 1, 1. 5, 2, and 2. 5. Test results indicated that the strength of geopolymer concrete and binder were hardly influenced by concentration of NaOH in solution and the activator ratio. Binder with activator ratio of 2. 5 has the highest compressive strength both in 8M and 10M NaOH system. However, in concrete, there are a few difference, concretes made with 8M NaOH and activators ratio of 2 have the highest compressive strength. This result might due to the low workability of fresh geopolymer concrete. On the other hand, binder and concrete made with 10M NaOH, showed the highest compressive strength when they were made with the activator ratio of 2,5.

Original languageEnglish
Title of host publicationGeopolymer and Green Technology Materials
PublisherTrans Tech Publications Ltd
Number of pages10
ISBN (Print)9783038352334
Publication statusPublished - 2015
Event2014 Malaysia-Indonesia Geopolymer Symposium, MIGS 2014 - Kuala Lumpur, Malaysia
Duration: 11 May 201412 May 2014

Publication series

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


Conference2014 Malaysia-Indonesia Geopolymer Symposium, MIGS 2014
CityKuala Lumpur


  • Compressive strength
  • Fly ash
  • Geopolymer
  • NaOH concentration
  • Trass


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