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

Year 2019, , 351 - 360, 21.10.2019

Anıl Niş

https://doi.org/10.29187/jscmt.2019.39

Cited By: 8

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 (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 (Na 2SiO3) and sodium
hydroxide (NaOH) solutions were utilized with four different sodium silicate to sodium hydroxide ratios (1,
1.5, 2, and 2.5) and three different molarities were utilized (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 (AC), the influence of the delayed oven-curing (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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