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Timang Palembangan, Memed
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Pengolahan Limbah Kantong Plastik menjadi Agregat Halus untuk Produksi Batako Ramah Lingkungan Lodi Honta, Zwengly; Padang, Israel; Timang Palembangan, Memed; Panggalo, Pendi; Suleman, Hendro
SCEJ (Shell Civil Engineering Journal) Vol. 10 No. 1 (2025): SCEJ (Shell Civil Engineering Journal)
Publisher : Department of Civil Engineering, Faculty of Engineering, Muhammadiyah University of Buton

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35326/scej.v10i1.7296

Abstract

Limbah plastik, khususnya kantong plastik, merupakan permasalahan lingkungan yang signifikan karena sifatnya yang tidak dapat terurai secara alami. Penelitian ini bertujuan untuk mengembangkan teknik pengolahan limbah kantong plastik menjadi agregat halus ramah lingkungan untuk bahan bangunan non-struktural, khususnya batako. Permasalahan utama adalah terbatasnya metode pengolahan limbah plastik yang menghasilkan material dengan karakteristik fisik yang sesuai standar agregat halus. Metode yang digunakan adalah perlakuan termal terhadap limbah plastik hingga suhu minimum 800°C untuk menghasilkan pasir plastik. Pasir plastik ini kemudian digunakan sebagai bahan substitusi agregat halus dalam adukan batako dengan variasi persentase 5%, 10%, dan 15% terhadap berat pasir. Pengujian dilakukan terhadap kekuatan tekan dan daya serap air batako. Hasil menunjukkan bahwa substitusi 5% memberikan performa terbaik, dengan kekuatan tekan sebesar 42,38 kg/cm² dan daya serap air terendah sebesar 17,12%. Substitusi di atas 5% menurunkan kekuatan tekan dan meningkatkan daya serap air akibat distribusi material yang tidak merata dan lemahnya ikatan antarpartikel. Keterbatasan dalam penelitian ini mencakup proses pembakaran masih manual dan terbuka, waktu pembakaran yang tidak menentu dan belum dilakukan uji ketahanan jangka panjang. Arah pengembangan selanjutnya difokuskan pada peningkatan kualitas kuat tekan dengan bahan tambah dan pengujian lebih lanjut terhadap durabilitas batako dalam kondisi lingkungan ekstrem.
The Significance Level of Critical Success Factors Affecting Contractor Performance in Winning Public Construction Tenders Timang Palembangan, Memed; Padang, Israel
Jurnal Impresi Indonesia Vol. 5 No. 4 (2026): Jurnal Impresi Indonesia
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/jii.v5i4.7611

Abstract

This study analyzes the Critical Success Factors (CSFs) influencing contractor performance in public construction tendering under the Ministry of Public Works in Indonesia. Using a quantitative approach and Structural Equation Modeling–Partial Least Squares (SEM-PLS), data were collected from 597 contractors, comprising 161 small, 187 medium, and 249 large firms. The results reveal that the significance of CSFs varies across contractor classifications. For small contractors, performance is significantly influenced by Equipment Resources (X2), Technology and Innovation (X4), Competitive Pricing (X6), and Regulatory Understanding (X7). For medium contractors, the most influential factors are Company Qualification (X1), Equipment Resources (X2), Human Resources (X3), Document Quality (X5), and Competitive Pricing (X6). Meanwhile, for large contractors, performance is mainly driven by Equipment Resources (X2), Technology and Innovation (X4), Document Quality (X5), Competitive Pricing (X6), and Regulatory Understanding (X7). Across all classifications, Competitive Pricing and Equipment Resources consistently emerge as key determinants of tender success. The model fit indices (NFI = 0.712–0.759) confirm the robustness and validity of the developed models. These findings provide empirical evidence of how CSFs differ by organizational scale, offering theoretical contributions to construction management research and practical insights for improving competitiveness, transparency, and efficiency in Indonesia’s public procurement system.
Co-Authors Honta, Zwengly Lodi Israel Padang Padang, Israel Panggalo, Pendi Suleman, Hendro