Compressive strength variation of alkali activated fly ash/slag concrete with different NaOH concentrations and sodium silicate to sodium hydroxide ratios

Authors : Anıl NİŞ
Pages : 351-360
Doi:10.29187/jscmt.2019.39
View : 56 | Download : 15
Publication Date : 2019-10-21
Article Type : Research Paper
Abstract :Waste disposal becomes a crucial issue for both the environment and the economy. One of the solutions for waste disposal is to utilize waste materials in concrete production. Nowadays, alkali activated concrete takes attention since waste materials insert ignore into journalissuearticles values(fly ash and ground granulated blast furnace slag); are utilized instead of ordinary Portland cement as binder materials. In this study, alkali activated fly ash/slag concrete is produced using 50% F-type fly ash and 50% ground granulated blast furnace slag and the compressive strength of the alkali activated fly ash/slag concrete is evaluated. The sodium silicate insert ignore into journalissuearticles values(Na 2SiO3); and sodium hydroxide insert ignore into journalissuearticles values(NaOH); solutions were utilized with four different sodium silicate to sodium hydroxide ratios insert ignore into journalissuearticles values(1, 1.5, 2, and 2.5); and three different molarities were utilized insert ignore into journalissuearticles values(6M, 10M, and 14M); for alkali activation to determine the effect of these parameters on the compressive strength of the alkali activated fly ash/slag concrete. In addition to ambient-curing insert ignore into journalissuearticles values(AC);, the influence of the delayed oven-curing insert ignore into journalissuearticles values(OC); was also studied to determine the effect of curing regime on the compressive strength of the alkali activated fly ash/slag concrete. The results indicated that both the alkali activator ratio and NaOH concentration significantly affected the compressive strength of the alkali activated fly ash/slag concrete. In addition, the delayed oven-curing was also  found as an important parameter for the compressive strength of the alkali activated fly ash/slag concrete.
Keywords : Alkali activated fly ash slag concrete, sodium hydroxide concentration, Molarity, sodium silicate to sodium hydroxide ratio

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