Contribution of Fineness Level of Fly Ash to the Compressive Strength of Geopolymer Mortar

Abstract

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.

Eco-Geopolymers: Physico-Mechanical Features, Radiation Absorption Properties, and Mathematical Model

“…It is well known that a greater fineness level of the FFA increases paste workability and the rate of geopolymerization, shortens setting time, and improves physical (density), mechanical (compressive and flexural strength), and microstructural (compact and uniform matrix) properties of the geopolymer [21,44]. The mechanism of improving the physical and mechanical properties of GPBM is also attributed to a higher amount of alkaline aluminosilicate gel [21,[49][50][51][52]. Accordingly, the better mechanical properties of the geopolymer were obtained when the Isken TPP FFA was used as raw material (Figure 2, Tables 2 and 3).…”

PROCESSING OF FLY ASH & BOTTOM ASH IN THE MANUFACTURING OF PAVING BLOCKS TO REDUCE THE TOTAL POLLUTION OF NON-B3 WASTE AT PLTU NAGAN RAYA

“…can Fly Ash Ash be used as a material to make high quality paving blocks. According to many studies, this effluent can react with calcium hydroxide (Ca(OH2)) of cement to form calcium silicate hydrate gel and seal cement, cement pores, Used in concrete mixes to improve performance when mixed to Give concrete increase and strength, Compressed concrete (Firdaus, et al 2017(Firdaus, et al , 2019Rosidawani, et al 2015Rosidawani, et al , 2020. However, bottom ash is an excellent alternative to sand in concrete mixes.…”