INVESTIGATION OF THE COMPRESSIVE STRENGTH OF GEOPOLYMER CONCRETES PRODUCED AT CONSTANT SOLUTION / BINDER RATIO IN DIFFERENT ALKALI ACTIVATORS AND MOLARITY


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Gürkan M. Ş. , Türkmen İ.

V. ULUSLARARASI BATTALGAZİ BİLİMSEL ÇALIŞMALAR KONGRESİ, Malatya, Turkey, 18 - 20 December 2020, vol.1, no.2, pp.251-257

  • Publication Type: Conference Paper / Full Text
  • Volume: 1
  • City: Malatya
  • Country: Turkey
  • Page Numbers: pp.251-257

Abstract

Cement constitutes 7% of the total CO2 emission in the world. Geopolymer, which is considered as the third generation cement after lime and portland cement, is considered as an alternative environmentally friendly product to portland cement due to its very low CO2 emission. In this study, geopolymer concrete samples were produced using binder material consisting of fly ash (FA) and blast furnace slag (BFS) and alkali activators (NaOH and KOH) with a fixed solution/binder ratio of 0.55. Concrete samples were prepared in 3 different mixing ratios (100% FA, 75% FA - 25% BFS and 50% FA - 50% BFS) and 3 different molarities (8 M, 10 M and 12 M) and these concretes have 3 different waiting times (on the 7th, 14th and 28th days) compressive strengths were examined. According to the results, an increase in compressive strength was observed with the increase of the BFS ratio, and it was determined that the best compressive strength in all the waiting periods was in the concrete samples produced with NaOH and KOH alkali activator at 10 M and 12 M concentrations, respectively.