CHARACTERISTICS OF GEOPOLYMER ARTIFICIAL AGGREGATE USE IN NORMAL CONCRETE

ADHITYA, BIMO BRATA and Saggaff, Anis and Saloma, Saloma and Hanafiah, Hanafiah (2024) CHARACTERISTICS OF GEOPOLYMER ARTIFICIAL AGGREGATE USE IN NORMAL CONCRETE. Doctoral thesis, Sriwijaya University.

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Abstract

The amount of natural coarse aggregate available is decreasing as construction demand grows and rock resources are exploited. The present decrease in the amount of natural aggregates poses an imminent threat to the concrete industry's sustainability, necessitating a quest for alternatives for natural coarse aggregates in concrete manufacturing. Artificial Geopolymer Aggregate manufactured from fly ash is a substitute to natural aggregate as a concrete filler. In the present study, class F fly ash from coal combustion residue at PT. Pupuk Sriwijaya was utilized as a precursor, with Na 2 SiO 3 and NaOH solution acting as alkali activators. This study assessed the compressive strength of geopolymer using 5 cm x 5 cm x 5 cm cube specimens dated 7 days. The geopolymer mixture is constructed based on numerous parameters, including fly ash (FA)/alkali activator (AA) mass ratio, Na 2 SiO 3 /NaOH mass ratio, NaOH concentration, sand/fly ash mass ratio, oven curing temperature, and oven curing time. After obtaining the highest compressive strength for each parameter, the mixtures were blended and the compressive strength test was performed again to determine the optimal compressive strength. The mixture with the greatest capacity for compression is subsequently used for manufacturing artificial geopolymer aggregates via pelletization and crushing. Artificial geopolymer aggregates generated by pelletization and crushing were evaluated for aggregate characteristics and compared to natural coarse aggregates from the Merak quarry. This study examined moisture content, specific gravity, water absorption, sieve analysis, and aggregate impact value (AIV). Concrete test specimens were subsequently manufactured using three different types of coarse aggregate and a design compressive strength f'c of 30 MPa. Furthermore, The present research examined the compressive strength, split tensile strength, and density of concrete at ages 3, 7, 14, and 28 days as well. The research indicates that the ideal geopolymer composition involves a mass ratio of 2.75 FA/AA and 3.5 Na 2 SiO 3 /NaOH. The Sand/FA possesses an added mass ratio of 0.15. To achieve the highest compressive strength, apply 15M NaOH and cure at 80℃ for 24 hours in the oven. The optimum mixture has a compressive strength of 71.28 MPa. Natural aggregate has a bulk-specific gravity SSD value of 2.55, while crushing aggregate has a value of 2.08, and pelletization aggregate has a value of 2.078. Natural aggregate contains 4.30% water content, while crushing aggregate has 1.81% and pelletization aggregate has 1.05%. Water absorption values for natural aggregate are 4.96%, crushing aggregate is 10.66%, and pelletization aggregate is 6.413%. The AIV values for natural aggregate is 1.452%, crushing aggregate is 17.4%, and pelletization aggregate is 8.66%. Natural aggregate concrete has a compressive strength after 28 days of 32.13 MPa, whereas crushing aggregate concrete has the lowest value of 29.13 MPa. Pelletization aggregate concrete has a compressive strength of 31.78 MPa. Natural aggregate concrete has a 28-day split tensile strength of 4,153 MPa, while crushing aggregate concrete has the lowest at 3.7 MPa. Pelletization aggregate concrete has a split tensile strength of 4,017 MPa. The density of natural aggregate concrete is 2307.78 kg/m 3 , while crushing aggregate has a density of 2023.92 kg/m 3 . Pelletization aggregate concrete has a density of 2023.92 kg/m . Concrete with geopolymer aggregate using the pelletization method has a compressive strength that is 1.09% smaller than natural aggregate concrete and has a lighter density of 11.57%. Pelletization aggregate concrete has a compressive strength above design f'c of 30 MPa. Meanwhile, concrete with crushing aggregate has a compressive strength that is 9.34% lower than the compressive strength of concrete with natural aggregate and has a concrete density that is 12.30% lighter than concrete with natural aggregate. Crushing concrete aggregate has a compressive strength that is slightly below the design compressive strength f'c of 30MPa. This shows that artificial geopolymer aggregate using the pelletization method can achieve the design compressive strength and with a lighter weight it will reduce the self-load on the building so that it can lighten the load carried by a building structure. For further research regarding the use of geopolymer artificial aggregate in concrete, it can be studied further regarding the manufacturing process which is easier to work on and can be studied from an economic perspective.

Item Type:	Thesis (Doctoral)
Uncontrolled Keywords:	fly ash, artificial aggregate, compressive strength
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA1-2040 Engineering (General). Civil engineering (General) > TA144 General works. Civil engineering, etc. Early to 1850
Divisions:	03-Faculty of Engineering > 21001-Engineering Science (S3)
Depositing User:	Bimo Brata Adhitya
Date Deposited:	05 Jun 2024 08:39
Last Modified:	05 Jun 2024 08:39
URI:	http://repository.unsri.ac.id/id/eprint/146261

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