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Januarti Jaya Ekaputri
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LEACHABLE BORON FROM FLY ASH Januarti Jaya Ekaputri
Purifikasi Vol 12 No 2 (2011): Jurnal Purifikasi
Publisher : Department of Environmental Engineering-Faculty of Civil, Environmental and Geo Engineering. Institut Teknologi Sepuluh Nopember, Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25983806.v12.i2.203

Abstract

Penelitian dilakukan untuk menentukan kandungan boron dalam abu terbang dengan Inductively Coupled Plasma Spectrometry (ICPS). Larutan fly ash dicampur dengan akuades kemudian dianalisis pH, waktu agitasi, konsentrasi boron, dan suhu. Terbukti bahwa abu terbang ditambah boron dapat cepat larut, yaitu sekitar 25%-30% dari kandungan boron total. Desorpsi ion boron terjadi sesudahnya. Setelah direndam lebih dari satu hari, penyerapan boron oleh fly ash meningkat sejalan dengan meningkatnya pH hingga 13. Keadaan ekuilibrium berubah setelah abu terbang kontak dengan air. Aluminium borat dapat melepaskan boron terlarut, sedangkan alkalinitas fly ash diyakini dapat membuat ion partikel pada permukaan fly ash mengikat boron.
GEOPOLYMER CONCRETE USING FLY ASH, TRASS, SIDOARJO MUD BASED MATERIAL Januarti Jaya Ekaputri; Triwulan Triwulan
Journal of Civil Engineering Vol. 31 No. 2 (2011)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v31i2.7594

Abstract

This paper presents the results of investigation to assess the mechanical properties of geopolymer concrete made with fly ash as a base material. Previous study showed that the compressive strength of geopolymer concrete were dependent on pozzolanic materials used and the concentration of activator solution in the mixture. The effort to use Sidoarjo Mud and trass as an additive material in the mixture was investigated in this study to analyze the mechanical properties of the concrete. NaOH solution mixed with Na2SiO3 was used as the activator solution which varied from 8 M to 14 M. Ratio of Na2SiO3 to NaOH solution by mass were also varied from 0.5 to 2.5 Trass and Sidoarjo Mud were introduced as the filler and mixed with fly ash to replace the volume of fly ash. Compressive strength test of cylindrical specimens at 28 days, split strength test and porosity test were carried out comprehensively to compare the specimens from each composition. The results showed that the best concrete will be produced when denser NaOH solution was used. Ratio of Na2SiO3 to NaOH in the solution also plays an important role to improve the mechanical properties of concrete. The result of this study also shows that Sidoarjo Mud is a prospective material for making geopolymer concrete.
Co-Authors Triwulan Triwulan