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All Journal Jurnal RISET Geologi dan Pertambangan Jurnal Keramik dan Gelas Indonesia Jurnal Keramik dan Gelas Indonesia
Lina Nur Listiyowati
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Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Electrical & Electronics Engineering Materials Science & Nanotechnology

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PROTOTIP GROUND ENHANCEMENT MATERIAL (GEM) BERBAHAN BAKU Na-BENTONIT KARANGNUNGGAL - TASIKMALAYA SEBAGAI BAHAN SUBSTITUSI GEM IMPOR Eko Tri Sumarnadi Agustinus; Happy Sembiring; Lina Nur Listiyowati
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 20, No 2 (2010)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (686.763 KB) | DOI: 10.14203/risetgeotam2010.v20.36

Abstract

ABSTRACT GEM is one of the composite material which is used as backfill to protect the electronic equipments, communication network and to stem the voltage of the electrical power problem. GEM has been commonly used in Indonesia, but it is still imported. Therefore it is important to look for substitution minerals. The main compositions of GEM are silica (Si), Aluminium (Al) and carbon (C ). Therefore, this research focus on the aluminofilosilicate minerals (bentonite, from Karangnunggal, Tasikmalaya), and charcoal. Laboratory experimentations include characterizations of raw materials, mineral engineering, and developing formulation and prototype of GEM. The result of this characterizations show that Na-bentonite is the most potential material for GEM raw materials (resistivity 514 Ohm cm). Mineral engineering is used to obtain the GEM formula and prototype in powder form with composition of 70% Na-bentonite, 24% charcoal, and 6% NaCl. However, practically it is necessary to add 5% water glass and 36% moisture content into the powder in order to obtain the resistivity of 16.4 Ohm cm. This study results in GEM which is qualified for the grounding materials standard (resistivity < 25 Ohm cm).
Study of Reduced Graphene Oxide addition on the Electrical Conductivity and Flexural Strength of Metakaolin-based Geopolymer Elsy Rahimi Chaldun; Andrie Harmaji; Nindya Kirana Prabaswari; Lina Nur Listiyowati; Achmad Subhan; Syoni Soepriyanto
Jurnal Keramik dan Gelas Indonesia Vol 29, No 1 (2020): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v29i1.6048

Abstract

Geopolymer with reduced Graphene Oxide (rGO) composite obtanined through Hummers method. This material is a substitute option for graphene because the nature of rGO is easier to produce in large quantities. In theory, it is expected that rGO can increase the flexural strength and electrical conductivity of geopolymer. The rGO composition used varies from 0-1 wt%. Geopolymer and their constituents were characterized by the Three Point Bending, EIS, SEM, FTIR, XRD, and XRF tests. Fly ash-based geopolymers have a flexural strength of 5.2 MPa at a composition of 0.5 wt% rGO, while metakaolin-based geopolymers with an addition of 0.25% rGO produce the highest flexural strength of 5.53 MPa. A frequency of 100,000 Hz tends to facilitate greater electrical conductivity, on fly ash-based geopolymers found electrical conductivity of 5.08 x 10-3 S / m, while for metakaolin-based geopolymers the electrical conductivity is higher ie 1.01 x 10-1 S / m. 
Study of Reduced Graphene Oxide addition on the Electrical Conductivity and Flexural Strength of Metakaolin-based Geopolymer Elsy Rahimi Chaldun; Andrie Harmaji; Nindya Kirana Prabaswari; Lina Nur Listiyowati; Achmad Subhan; Syoni Soepriyanto
Jurnal Keramik dan Gelas Indonesia Vol 29, No 1 (2020): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v29i1.6048

Abstract

Geopolymer with reduced Graphene Oxide (rGO) composite obtanined through Hummers method. This material is a substitute option for graphene because the nature of rGO is easier to produce in large quantities. In theory, it is expected that rGO can increase the flexural strength and electrical conductivity of geopolymer. The rGO composition used varies from 0-1 wt%. Geopolymer and their constituents were characterized by the Three Point Bending, EIS, SEM, FTIR, XRD, and XRF tests. Fly ash-based geopolymers have a flexural strength of 5.2 MPa at a composition of 0.5 wt% rGO, while metakaolin-based geopolymers with an addition of 0.25% rGO produce the highest flexural strength of 5.53 MPa. A frequency of 100,000 Hz tends to facilitate greater electrical conductivity, on fly ash-based geopolymers found electrical conductivity of 5.08 x 10-3 S / m, while for metakaolin-based geopolymers the electrical conductivity is higher ie 1.01 x 10-1 S / m. 
Co-Authors Achmad Subhan Andrie Harmaji Eko Tri Sumarnadi Agustinus Elsy Rahimi Chaldun Happy Sembiring Nindya Kirana Prabaswari Syoni Soepriyanto