Abstract
The development of geopolymers has allowed the flash as the substitution of cement in the application of concrete. Therefore, this will be very useful considering the quite abundant by-product materials from power plants burning coal in South Sumatera. However, the untreated fly ash from the source caused its fineness level unpredictable, whereas the fineness of binder in cementitious material significantly affects the mechanical properties of the harden. Therefore, this study aims to determine the contribution of the fineness level of fly ash to the compressive strength of geopolymer mortar, as well as its excellent composition. Type F fly ash from Tanjung Enim Power Plant was treated by filtering to obtain different fineness levels based on the fall zones of the ash. Activators used in geopolymer mixing were sodium hydroxide (NaOH) and sodium silicate (Na 2 SiO 3 ) with three activator/fly ash ratios which was 0.25, 0.35 and 0.45. The results showed that the fineness level based on fall zone as well as the activator to fly ash ratio significantly influenced the compressive strength of the geopolymer mortar. The compressive strength of the F4-P4 specimen of geopolymer mortar with zone-4 fly ash and an activator ratio of 0.45 achieved 28.2 MPa at 28 days.
Highlights
Concrete, as the most favorite material, increases in its usage through the years and requires the availability of seemingly unlimited amounts of each composition material
Fly ash fineness based on fall zones contributed significantly to the compressive strength of the geopolymer
4 Conclusions i) Fly ash fineness based on fall zones contributed significantly to the compressive strength of the geopolymer mortar
Summary
As the most favorite material, increases in its usage through the years and requires the availability of seemingly unlimited amounts of each composition material. The increasing concrete usage results in high demand for cement. The cement industry is one of the main contributors to CO2 emissions in the air. One ton of cement produced causes one ton of CO2 emitted into the air. Carbon dioxide emissions are causing global warming, which causes climate change. For this reason, the research for partial and full cement substitution in concrete has gained a lot of attention in the past decades
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