Civil Engineering and Architecture Vol. 12(2), pp. 788 - 797
DOI: 10.13189/cea.2024.120209
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The Effect of Fly Ash Based Geopolymer Aggregate Using Crushing and Pelletization Methods on the Mechanical Properties of Concrete

Bimo Brata Adhitya ^1,2,*, Rosidawani ², Budi Nayobi ², M. Hadziq Huda ², Defiria Afifah ^2
1 Doctor Degree Program, Faculty of Engineering, Universitas Sriwijaya, Indonesia
² Department of Civil Engineering and Planning, Faculty of Engineering, Universitas Sriwijaya, Indonesia

ABSTRACT

Over the last decade, there has been significant growth in the world in infrastructure developments, leading to an increase in the consumption of materials. One of the most commonly used materials in the construction industry is concrete which is made up of several constituent elements including coarse aggregates. The availability of these aggregates in nature was observed to have been reduced significantly, thus leading to the search for alternative sources. The production of artificial aggregates through the geopolymerization process is an example of this alternative source. The process involves reacting materials containing high content of silica and alumina such as fly ash with an alkaline activator. Therefore, this study is aimed at analyzing the effect of fly ash-based artificial aggregates produced using crushing and pelletization methods on the mechanical properties of concrete. The ratio of the mass of fly ash to the mass of alkali activator in the geopolymer artificial aggregate composition is 3:1. The mass ratio of Na₂SiO₃ to NaOH was 2.5:1, the concentration of NaOH was 15 M, and the addition of sand was 15% of the fly ash mass. The concrete composition for the three types of aggregate, namely natural aggregate, crushing aggregate, and pelletization aggregate, uses constituent materials with the same volume with adjustments, type, and uses the same manufacturing method. Natural aggregate concrete has the highest compressive strength and tensile strength of concrete, followed by pelletization of aggregate concrete, then crushing of aggregate concrete. The compressive strength values of the 28-day-old concrete for the three aggregates were respectively 28,976 MPa, 25,582 MPa, and 23,418 MPa and the tensile strength values for the 28-day-old concrete for the three aggregates were respectively 2,917 MPa, 2,641 MPa, and 2,323 MPa. Since the design compressive strength value of pelletized aggregate concrete is achieved, geopolymer aggregate using the pelletization method can be used as an alternative to natural aggregate.

KEYWORDS
Aggregate, Fly Ash, Pelletization, Crushing, Geopolymer

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Bimo Brata Adhitya , Rosidawani , Budi Nayobi , M. Hadziq Huda , Defiria Afifah , "The Effect of Fly Ash Based Geopolymer Aggregate Using Crushing and Pelletization Methods on the Mechanical Properties of Concrete," Civil Engineering and Architecture, Vol. 12, No. 2, pp. 788 - 797, 2024. DOI: 10.13189/cea.2024.120209.

(b). APA Format:
Bimo Brata Adhitya , Rosidawani , Budi Nayobi , M. Hadziq Huda , Defiria Afifah (2024). The Effect of Fly Ash Based Geopolymer Aggregate Using Crushing and Pelletization Methods on the Mechanical Properties of Concrete. Civil Engineering and Architecture, 12(2), 788 - 797. DOI: 10.13189/cea.2024.120209.