Abstract
This paper presents the result of studies on utilizing metakaolin obtained from Belitung as fly ash substitute material to produce geopolymer paste. Mechanical properties were assessed by compressive strength while physical properties were assessed by setting time, porosity, microstructure test and density test. The experiment was performed on geopolymer paste with 0, 25%, 50%, 75% and 100% fly ash replacement with metakaolin. Sodium Hidroxide (NaOH) with concentration of 10 Molars and Sodium Silicate (Na2SiO3) were used as alkaline activator. In addition, activator ratio between sodium silicate to sodium hidroxide of 2 was applied. The result obtains that increasing metakaolin contain in mixture deliver longer setting time, higher open pore number, lower density and lower compressive strength of geopolymer paste. However, adding metakaolin up to 25 % into geopolymer paste mixture could increase mechanical and physical properties of geopolymer paste.
Highlights
Research on investigating alternative material as cement substitute becomes a massive issue in construction industry
Geopolymer material, a new eco green material synthesized from precursor and alkaline activator revealed as a promising construction material to reduce utilization of Portland cement [3]
A waste material derived from coal combustion process which rich in silica and alumina become a popular precursor in producing geopolymer binder [4]
Summary
Research on investigating alternative material as cement substitute becomes a massive issue in construction industry. Previous research proved that utilizing cement contribute bad environment effect due to high CO2 emitted during its production [1, 2]. Reducing cement use by replacing or substituting it with other eco green material will be an enable solution for a better future. Geopolymer material, a new eco green material synthesized from precursor and alkaline activator revealed as a promising construction material to reduce utilization of Portland cement [3]. Precursor which has high silica and alumina content is required to produce geopolymer binder. A waste material derived from coal combustion process which rich in silica and alumina become a popular precursor in producing geopolymer binder [4]. Sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) are used as alkaline activator
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