Characterization and compressive strength of fly ash based-geopolymer paste

Widayanti, Ari; Soemitro, Ria Asih Aryani; Suprayitno, Hitapriya; Ekaputri, Januarti Jaya

doi:10.1051/matecconf/201819501023

Cited by 8 publications

(11 citation statements)

References 29 publications

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“…A total of 75% of fly ash was used to utilize it as much as possible, and it was mixed homogeneously. The alkali activator ratio (Na2SiO3/ 8M NaOH) was 2.5 [43]. The 8M NaOH offered the highest strength; this is in line with the previous studies [43], [44].…”

Section: Research Materialssupporting

confidence: 90%

“…Figure 10 shows that the color of fly ash is yellowish-light brown. The fly ash contained finegrained material particles of a small size and smooth, spherical, and regular shape [43]. The observation that the fly ash contained particles of spherical shape, different sizes, and relatively smooth outer surface similar with the other studies.…”

Section: The Fly Ash Propertiessupporting

confidence: 88%

“…The alkali activator ratio (Na2SiO3/ 8M NaOH) was 2.5 [43]. The 8M NaOH offered the highest strength; this is in line with the previous studies [43], [44]. The artificial aggregate mixture was then casted into a mold, and it was crushed using a stone crusher machine after 28 days.…”

Section: Research Materialssupporting

confidence: 83%

“…The fly ash was obtained from the Suralaya Power Plant Unit 1-7, Cilegon, Banten, Indonesia. This fly ash was classified as F class [43]. The artificial aggregate was produced from fly ash (75%) and alkali activator (25%).…”

Section: Research Materialsmentioning

confidence: 99%

“…The addition of artificial aggregate can overcome the issues of RAP gradation. The artificial aggregate with a composition of 75% fly ash and 25% alkali activator (Na2SiO3 and 8M NaOH; with a ratio of 2.5) exhibited the highest strength [27], [43], [46] owing to the chemical composition of fly ash comprising the largest Si/Al obtained from the Suralaya unit.…”

Section: Rapmentioning

confidence: 99%

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Asphalt Concrete Mixture Produced Using Reclaimed Asphalt Pavement and Fly Ash as Artificial Aggregate and Filler

et al. 2021

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This study presents the use of reclaimed asphalt pavement (RAP), and fly ash as artificial aggregate and filler in asphalt concrete. Because of the limited availability of natural materials, infrastructure development has become a concern. Therefore, it is necessary to reuse and recycle waste materials. One such innovation is artificial aggregates. The disadvantage of RAP is that its gradation exceeds the standard; its asphalt penetration and ductility exceed the requirements. The weaknesses of artificial aggregate are high water absorption, spherical shape, and low aggregate interlocking. In this study, the artificial aggregate was produced using the fly ash and alkali activator. Alkali activator consisted of Na2SiO3 and 8M NaOH at a ratio of 2.5. The mixtures containing different percentages of artificial aggregate (45, 55, 65, and 75%) were produced, and the fly ash filler content was 5%. Different tests including XRF, SEM, and Marshall tests were conducted. The artificial aggregate is hydrophilic owing to the high silica content; thus, it has high water absorption. This results in a low adhesion between the asphalt and aggregate. The best composition of asphalt concrete is 55% artificial aggregate, RAP, fly ash filler, and asphalt. The asphalt concrete containing artificial aggregate has high stability and is stiff and light. However, it requires a high asphalt content because of high water absorption. It is unsuitable for application in high traffic roads but suitable for medium traffic ones.

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Section: Research Materialssupporting

confidence: 90%

Section: The Fly Ash Propertiessupporting

confidence: 88%