Effects of the nature of chemical activator on the compressive strength of calcined clay geopolymer mortar

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Abstract

Low purity kaolin clay is presently receiving attention as a promising aluminosilicate source that has the potential of extending the application of geopolymers because of its global abundance and low embodied energy, but its strength performance depends substantially on the calcination process, mineralogy of the clay, type and proportion of chemical activator etc. This work focuses on comparing the compressive strength of calcined clay geopolymer mortars activated by three forms of chemical activators. Three groups of geopolymer mortar mixes were prepared and tested, group one utilizes
sodium hydroxide solution (NaOH) prepared by adding 68% water to the pellets 24 hrs prior to mixing, group two based on sodium silicate solution derived by adding 55.9% water to sodium metasilicate pentahydrate (Na2SiO3.5H2O) 24 hrs prior to mixing, while the group three mixes were activated with industry produced Na2SiO3 solution that has 54.5% solid component. The results show that high compressive strength is achieved by developing calcined clay geopolymer mortar using high viscosity industry produced sodium silicate solution, while very low strength is achieved by utilizing sodium silicate containing chemically bounded water. The result further shows that the
compressive strength of the geopolymer mortars are enhanced by sealed curing of the samples.
Original languageEnglish
Title of host publicationFifth International Conference on Sustainable Construction Materials and Technologies (SCMT5): Volume 3 (SCMT Conferences)
EditorsEsmaiel Ganjian, Peter Claisse, Mukesh Limbachiya, Arpit Goyal
PublisherInternational Committee of the SCMT conferences
ChapterSCMT5
Pages17-28
Number of pages11
Volume3
Publication statusPublished - 14 Jul 2019
EventFifth International Conference on Sustainable Construction Materials and Technologies - Kingston upon Thames, United Kingdom
Duration: 14 Jul 201917 Jul 2019
Conference number: 5
https://www.kingston.ac.uk/events/item/2839/14-jul-2019-fifth-international-conference-on-sustainable-construction-materials-and-technologies-scmt5/

Publication series

Name
ISSN (Print)2515-3048
ISSN (Electronic)2515-3056

Conference

ConferenceFifth International Conference on Sustainable Construction Materials and Technologies
Abbreviated titleSCMT5
CountryUnited Kingdom
CityKingston upon Thames
Period14/07/1917/07/19
Internet address

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Keywords

  • Calcined clay
  • sodium silicate
  • sodium hydroxide
  • geopolymer
  • mortar
  • compressive strength

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials
  • Materials Science(all)

Cite this

Shinkafi, A. B., Khorami, M., Ganjian, E., & Tyrer, M. (2019). Effects of the nature of chemical activator on the compressive strength of calcined clay geopolymer mortar. In E. Ganjian, P. Claisse, M. Limbachiya, & A. Goyal (Eds.), Fifth International Conference on Sustainable Construction Materials and Technologies (SCMT5): Volume 3 (SCMT Conferences) (Vol. 3, pp. 17-28). [5132] International Committee of the SCMT conferences.