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All Journal Jurnal Teknik Sipil dan Perencanaan Journal of Geoscience, Engineering, Environment, and Technology Journal Dynamic SainT INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY
Sunarno, Yohans
Program Studi Teknik Sipil, Fakultas Teknik, Universitas Kristen Indonesia Toraja
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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Journal : Journal of Geoscience, Engineering, Environment, and Technology

 1 
Application of Carbon Nanotube (CNT) to Improve Mechanical Properties of Concrete: A Comparative Analysis with Superplasticizer Sunarno, Yohans; Abduh, Natsir; Eka Yuniarto; Tumpu, Miswar; Nelfia, Lisa Oksri
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 1 (2025): JGEET Vol 10 No 01 : March (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.1.19526

Abstract

Many researchers' interest in carbon nanotube (CNT) materials has grown as a result of their potential use in the construction industry. This is mostly related to the mechanical, electrical, thermal, kinetic, and chemical properties of CNT, which have a big impact on the way concrete functions. Hydrated calcium silicate is a complex network of binding particles that compose the cement composite material known as concrete. Since it has nanoscale features, CNT will interact most strongly with hydrated calcium silicate, improving the concrete's mechanical qualities. The purpose of this study is to ascertain the impact of adding CNT to concrete mixtures. Three distinct mixes were created by varying the types and amounts of admixtures that were added to the concrete mix.  Two mixed variations employed CNT at various doses, while one mixed variation used admixture type F (superplasticizer), and the performance of one was compared to the other. Concrete that was both new and hard underwent specimen testing. On fresh concrete, a slump test was conducted using ASTM C163, while for hard concrete, cylindrical specimens measuring 100 mm x 200 mm were tested for unit weight and compressive strength at 7, 14, and 28 days following ASTM C39. According to the test results, utilizing CNT at a lower dose than the typical superplasticizer dose leads to greater workability and compressive strength. The results of the workability and compressive strength tests will be improved by the inclusion of CNT.
Analysis of the Potential and Impact of Utilizing Nickel Slag Powder and Recycled Plastic on the Technical Properties of Concrete Blocks: In Terms of Strength and Cost Efficiency Nelfia, Lisa Oksri; Rahman, Muhammad Rifqon Fahrezza; Adijaya, Krisma; Sunarno, Yohans
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 4 (2025): JGEET Vol 10 No 04 : December (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.4.24979

Abstract

Plastic waste and nickel slag are significant environmental pollutants, while the construction sector demands sustainable building materials. This study investigates the use of nickel slag powder as a partial cement replacement and recycled High-Density Polyethylene (HDPE) plastic as a partial replacement for fine aggregate in concrete block production. Laboratory tests were conducted in accordance with SNI standards for compressive strength, splitting tensile strength, porosity, permeability, and cost. Results showed that low substitution levels (2.5–10%) improved both strength and durability. The highest compressive strength of 10.43 MPa was achieved at a 5% substitution level, compared to 7.13 MPa in the control mix, while the maximum tensile strength of 1.32 MPa was observed at a 2.5% substitution level. Porosity was reduced to 0.97% and permeability to 4.13 × 10⁻⁷ cm/s, indicating a denser microstructure. Cost analysis revealed a reduction from Rp9,128.80 per block (0% substitution) to Rp8,252.36 at 10%, yielding savings of about 9.6%. However, higher substitution levels (>10%) led to strength loss and increased porosity due to incomplete hydration and weak bonding. The results confirm that the optimal substitution range of 2.5–10% balances performance and cost, providing an eco-friendly and cost-effective solution for sustainable concrete block production within a circular economy framework.
Co-Authors Abdias Tandy Arrang Abduh, Natsir Abraham Ganti Achmad Bakri Muhiddin Adijaya, Krisma Adijaya Agustina Pagatiku Ambun, Ermitha Amiri, Ouali Andi asiz, Andi Eka Yuniarto Escher Kalapadang Feri Daud Biang Gersony Miri Harni Tarru Hasyim Basri Hernita Matana Honta, Zwengly Lodi Irnawaty, Rita Jery D. Paridy Jufri Manga Krisma Adijaya, Krisma Marinus Linggi Memed Timang Nelfia, Lisa Oksri Oksri-Nelfia, Lisa Parea Rusan Rangan Rael Rabang Matasik Rahman, Muhammad Rifqon Fahrezza Rangan, Parea Rusan Regita O. Runtukahu Tjaronge, M. W. Tumpu, Miswar Wiguno, Mindy Barend Yohanis B. Lotim Yulieanti S. Mapaliey Yusran Londongsalu Zain Patongloan