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Civil Engineering Study Program, Institut Teknologi Sumatera, South Lampung, Indonesia.
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Analisis Time Cost Trade Off sebagai Strategi Percepatan Proyek untuk Efisiensi Pembangunan Gedung Laboratorium Teknik 4 Institut Teknologi Sumatera Septi, Fadillah Tri; Sari, Dian Perwita
Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil Vol. 10 No. 1 (2026)
Publisher : Universitas Ibn Khaldun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/komposit.v10i1.22126

Abstract

Project delays in construction are complex issues that have a significant impact on increasing costs and completion time. This study aims to analyze the optimal project acceleration strategy for the construction of the Engineering Laboratory Building (GLT) 4 at ITERA, which is experiencing delays, by applying the Time Cost Trade Off (TCTO) method. This quantitative research compares three alternative acceleration strategies: adding working hours (overtime), adding work shifts, and adding labor and heavy equipment. Primary data was obtained through interviews with the contractor, while secondary data included the time schedule, the Budget Plan (RAB), and other project documents. The analysis was conducted by compiling a critical work network, calculating normal duration and costs, and analyzing the crash duration and crash cost for each alternative. The results show that the project's normal condition has a duration of 224 days with a total cost of Rp 16,927,594,301. All three acceleration strategies proved effective in reducing both duration and cost. The strategy of adding labor and heavy equipment proved to be the most optimal, resulting in a duration of 163 days (time efficiency of 27.23%) with the highest cost efficiency of 5.75%. The alternative of adding work shifts resulted in the fastest duration of 161 days (time efficiency of 28.13%), but with lower cost efficiency (4.92%). Meanwhile, adding overtime hours was the weakest alternative with a duration of 178 days (time efficiency of 20.54%) and a cost efficiency of 3.51%. The research confirms that adding resources (labor and equipment) provides the most beneficial time-cost trade-off for this project, where the indirect cost savings from shortening the heavy equipment rental period are greater than the additional direct costs.
Bantuan Teknis Desain Konstruksi Beton Non-Struktural Berbasis Pemanfaatan Limbah Industri Batching Plant dan Asphalt Mixing Plant untuk Mendukung Infrastruktur Berkelanjutan Ribowo, Anggarani Budi; Maini, Miskar; Sihombing, Tera Melya Patrice; Yuliyanto, Andry; Zhafira, Elian; P, Kirtinanda; Novalina, Winny; Rahma, Siti; Marina, Bernaditha Catur; Sitepu, Arif Rahman Hakim; Apriwelni, Siska; Kiranaratri, Ayudia Hardiyani; Sari, Dian Perwita; Utami, Erdina Tyagita; Tambunan, Hermon Frederik
Jurnal Pengabdian Masyarakat Bhinneka Vol. 4 No. 3 (2026): Bulan Februari
Publisher : Bhinneka Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58266/jpmb.v4i3.1233

Abstract

Industri konstruksi seperti batching plant dan Asphalt Mixing Plant (AMP) menghasilkan limbah berupa sisa beton mengeras, slurry pencucian mixer, agregat terkontaminasi semen, serta residu aspal halus yang berpotensi menimbulkan dampak lingkungan apabila tidak dikelola dan dimanfaatkan secara optimal. Kegiatan pengabdian kepada masyarakat ini bertujuan mendukung penerapan infrastruktur berkelanjutan melalui optimalisasi pemanfaatan limbah konstruksi sebagai bahan baku alternatif beton non-struktural. Program dilaksanakan melalui tahapan identifikasi jenis dan volume limbah (±1–2 ton per minggu), pengolahan awal (pengeringan, penghancuran, dan pengayakan), perancangan komposisi campuran (mix design), pencetakan produk, curing selama 28 hari, serta pengujian kuat tekan dan daya serap air. Hasil perancangan menghasilkan batako berdimensi 40 × 20 × 10 cm, paving block 20 × 10 × 6 cm, serta saluran beton pracetak dengan lebar 40–85 cm dan tinggi 45–60 cm. Secara teknis, agregat limbah batching plant efektif sebagai substitusi parsial agregat alami, sedangkan residu AMP berfungsi sebagai filler yang meningkatkan kepadatan dan menurunkan porositas beton. Produk yang dihasilkan memenuhi kriteria mutu beton non-struktural untuk aplikasi pagar, perkerasan pejalan kaki, dan saluran drainase kawasan industri skala kecil–menengah maupun saluran irigasi. Kegiatan ini berkontribusi pada pengurangan timbulan limbah, efisiensi biaya material, serta penguatan prinsip ekonomi sirkular dalam pembangunan infrastruktur berkelanjutan.
Co-Authors Ahmad Fahreza Alvin Rahmat Habibie Mashur Ananda Agneshia Putri Andreas Wibowo Andry Yuliyanto Anita Lestari Condro Winarsih Apriwelni, Siska Ayu Herzanita Ayudia Hardiyani Kiranaratri Azaria Andreas Budi Ribowo, Anggarani Dicky Rahadianto Dicky Rahadianto Hajar Kamilah Herawati Zetha Rahman Jade Sjafrecia Petroceany Kirana R. Ririh Kirana Rukmayuninda Ririh Kristianto Usman Ledy Enjelina Mahani, Iris Marina, Bernaditha Catur Miskar Maini Novalina, Winny P Kirtinanda Perdana Miraj Rajiman Rajiman Rizal Z. Tamin Septi, Fadillah Tri Sihombing, Tera Melya Patrice Sitepu, Arif Rahman Hakim Siti Rahma Suhardi Suhardi Tambunan, Hermon Frederik Utami, Erdina Tyagita Yuliyanto, Andry Zhafira, Elian