@Article{, title={Experimental Investigation on Compressive Strength Enhancement of Geopolymer Paste Fly Ash/ Slag Based Cured at Ambient Condition}, author={Wrood H. Sachet and Wissam D. Salman and Safie Mahdi Oleiwi and Dia Eddin Nassani}, journal={DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية}, volume={13}, number={2}, pages={87-92}, year={2020}, abstract={In this paper, the effects of ground granulated blastfurnace slag (GGBFS) content proportion on thedevelopment of compressive strength of geopolymerpastes were studied. Eleven geopolymer pastes mixesreplacement (0% to 100%) by increment (10%) ofbinder(Fly Ash) by GGBFS with three mini-sizespecimens (50-mm cube) compression tests wereconducted at ambient condition (30 ± 2 °C). Class F-flyash (FA) and GGBFS were used as aluminosilicatesource. The alkaline activator was a combine of sodiumsilicate (SS) solution and sodium hydroxide (SH) solutionwith (SS/SH) ratio of (2.0) and molarity of sodiumhydroxide of (10M). Based on the test results, it was findthat the addition of ground granulated blast furnace slag(GGBFS) to geopolymer paste based fly ash causedincrease significantly of compressive strength when curedat ambient condition, and the optimum mix was found tohave GGBFS content of 100%, can be improved thecompressive strength as high as (74% and 62%) at 7 and28 days respectively. The reason for this trend is that theincreasing forming of calcium silicate hydrate C-S-H gelof geopolymer pastes containing a large amount ofGGBFS caused more denser microstructure. Lastly, it isworth noting that this test methodology used in this studyis for the purpose of determining the best ratio of slagreplacement with fly ash in geopolymer paste, to give thehighest improvement ratio in compressive strengthcompared with the reference (Fly Ash based geopolymerpaste).

} }