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Journal : Journal of Educational Technology and Learning Creativity

A Circular Economy Approach: Total Elimination of Extreme Swelling in Expansive Clay Using Pyrolytic Carbon Black and Fly Ash Hasrullah, Hasrullah; Mansur, Achmad Zultan
Journal of Educational Technology and Learning Creativity Vol. 3 No. 2 (2025): December
Publisher : Cahaya Ilmu Cendekia Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37251/jetlc.v3i2.2342

Abstract

Purpose of the study: To rigorously investigate and quantify the effectiveness of a novel, synergistic stabilizer composed of Pyrolytic Carbon Black (PCB) and Fly Ash in totally eliminating extreme swelling potential in highly problematic expansive clay soil. Methodology: The comprehensive methodology included initial characterization, Modified Proctor compaction, One-Dimensional Swelling tests, Unconfined Compressive Strength (UCS) tests, and California Bearing Ratio (CBR) tests. Expansive clay was treated with a combined stabilizer dosage up to 25% (15% PCB and 10% Fly Ash) and cured for 28 days. Main Findings: The stabilizer significantly enhanced compaction characteristics, increasing the Maximum Dry Density (MDD) from 1.62 g/cm3 to 2.18 g/cm3. Crucially, the extreme Free Swell Index (FSI) of 120.23% was totally eliminated (swelling reduced to 0%). Mechanical strength improved dramatically: UCS increased from 0.12 kg/cm2 to 1.98 kg/cm2 , and unsoaked CBR enhanced from 2.48% to 10.18%. Novelty/Originality of this study: This research provides the first conclusive quantitative evidence of total swelling elimination in expansive clay using this specific PCB and Fly Ash sustainable blend. It advances knowledge by bridging geotechnical science, green engineering, and the circular economy, demonstrating a viable, cost-effective solution utilizing two major waste streams (tires and coal ash) for critical infrastructure subgrades.
Co-Authors Adi Hermawansyah Aftah, Chairul Ahmad Husain Mappaseling, Ahmad Husain Ahmad Syarif, Iif Akbar, Aditya Andani, Indriani Andi Alimuddin Unde, Andi Alimuddin Andi Muhammad Abdi Anggerwati, A. Indah Anggriani, Ririn Ansar Suherman, Ansar Aprianto, M. Tomi Aris, Ardiyanti Arland Yusran, Arland Arnus, Sri Hadijah Burhanuddin, A Putri Permatasari Arafah Chatarina Umbul Wahyuni Estu Pratiwi, Yupitari Fathurrijal, Fathurrijal Firdaus Wahyudi Fudjaja, Letty Hafied Cangara, Hafied Hamida Hasan Harwadi, Fuad Hasandi, Ilman Hasrullah, Excelsia Ramadhany Hendra Maniza, Lalu Hernadi, Ahmad Hidayati, Nurmalika I Gusti Ngurah Antaryama Ishanan, Ishanan Jeanny Maria Fatimah Judijanto, Loso Karnay, Sudirman Karunia Akbar, Ilham Kusuma, Afandi La Jaali, La Laras, Dwi lestari, winda Lisa Musfirah, Lisa Merdikna Raturain, Putri Mochtar Touwe, Mochtar Mokodenseho, Sabil Muhammad Iqbal Sultan, Muhammad Iqbal Muhammad Nur Muhammad Syafri, Muhammad Muhammad Yahya Musran Munizu Mustakim Mustakim Nor, Syariyan Nosakros Arya, Nosakros Nurdin, Muhammad Firdan Nuri Sanjaya, Irfan Nurwijayanti Prakoso , Cathas Teguh Pratama, Rafael Verdyansyah Purnomo, Cahyo Raden Firdaus Wahyudi, Raden Firdaus Rahmadani, Noviyanti Putri Rahmadiansyah, Afique Rande , Santi Rosniar Rosniar, Rosniar Sagena, Uni W sahrani Putri, Risma Saleh, Sitti Fithriani Seltika Canta, Dila Selva, Selva Setyaningsih, Erlin Siwansyah, Siwansyah Sonni, Alem Febri Syahrir Soleman, Syahrir T, Ruslang Taqwa, Amrullah Verdyansyah Pratama, Rafly Virginiawati, Aulia Wahyu Santoso Wahyuni, Nuorma Wildana Al Kautsar, Arifa Wirawan Jaya, Wirawan Wisesa, Harna Rizki Yudistia, Tasya Takhayaza Yuhdi Fahrimal Zahron, Evi Ziraldo, Bryan Zultan Mansur, Achmad