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All Journal Journal of Civil Engineering and Planning (JCEP) STATIKA: Jurnal Teknik Sipil
Putri Ayu Dwiyana
Institut Teknologi Sumatera
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Engineering Transportation

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PREDIKSI NILAI CBR LABORATORIUM BERDASARKAN PARAMETER INDEKS TANAH (ATTERBERG LIMIT, SPESIFIC GRAVITY) DAN DATA PEMADATAN PROCTOR Arif Rahman Hakim Sitepu; siti rahma; Erdina Tyagita Utami; siska apriwelni; Putri Ayu Dwiyana
STATIKA: Jurnal Teknik Sipil Vol. 11 No. 2 (2025): STATIKA: JURNAL TEKNIK SIPIL
Publisher : Politeknik Raflesia Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53494/jts.v11i2.1221

Abstract

Penelitian ini menggunakan metode regresi linier berganda (Multiple Linear Regression Analysis/MLRA) untuk memprediksi nilai California Bearing Ratio (CBR) dalam kondisi tidak jenuh (unsoaked) berdasarkan parameter parameter tanah hasil pengujian laboratorium, yaitu batas Atterberg (LL, PL, PI), berat jenis tanah (Specific Gravity/Gs), serta parameter pemadatan standar Proctor seperti MDD dan OMC. Seluruh pengujian dilakukan sesuai dengan standar ASTM yang berlaku. Hasil analisis regresi linier sederhana (SLRA) menunjukkan bahwa nilai koefisien determinasi (R²) yang diperoleh masih tergolong rendah, masing-masing sebesar 0,2504 untuk LL, 0,6989 untuk PL, 0,2326 untuk PI, 0,0829 untuk Gs, 0,3427 untuk MDD, dan 0,0917 untuk OMC. Nilai-nilai ini mengindikasikan bahwa model SLRA belum mampu menggambarkan hubungan yang kuat antara masing-masing parameter terhadap nilai CBR. Sebaliknya, hasil regresi linier berganda menunjukkan bahwa kombinasi parameter LL, PL, dan MDD menghasilkan R² sebesar 1, yang berarti seluruh variasi nilai CBR unsoaked dapat dijelaskan oleh model dengan sangat baik. Model lainnya, yang menggabungkan PI, Gs, dan OMC, juga menunjukkan hasil yang sama dengan nilai R² sebesar 1. Oleh karena itu, dapat disimpulkan bahwa metode MLRA jauh lebih akurat dan dapat diandalkan untuk memprediksi nilai CBR dibandingkan SLRA, serta berpotensi menghemat waktu dan biaya dalam proses perencanaan dan evaluasi teknis pada proyek infrastruktur jalan.
Cost and Time Optimization Analysis using the Time Cost Trade Off Method Putri Ayu Dwiyana; Siti Agmaliza; Rajiman
Journal of Civil Engineering and Planning (JCEP) Vol. 6 No. 2 (2025)
Publisher : Program Studi Sarjana Teknik Sipil Universitas Internasional Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37253/jcep.v6i2.11446

Abstract

The implementation of construction projects often faces delays that are difficult to avoid, as experienced in the construction of the City X Hospital Building, where there was a discrepancy between the initial plan and actual field implementation, resulting in a two-week delay in weekly progress. This study aims to analyze time and cost efficiency and compare the effectiveness of alternatives between extending working hours and adding labor using the Time Cost Trade Off method. This research is comparative, comparing the total cost and duration of the project for both acceleration alternatives. The total project cost under normal conditions was recorded at IDR 7,289,386,643.45 with a duration of 86 days until the completion of the third floor. The analysis shows that extending working hours by 1 to 4 hours resulted in costs of IDR 14,584,817,481; IDR 21,871,659,072; IDR 28,672,701,971; and IDR 34,564,808,294, with cost efficiency of –100.08%, –200.05%, –293.35%, and –374.18%, respectively. The project duration was reduced to 64, 50, 41, and 36 days, with time efficiency of 26%, 42%, 53%, and 58%. Meanwhile, the alternative of adding labor resulted in a total cost of IDR 13,660,989,499 with a cost efficiency of –87.41% and a project duration of 64 days (26% time efficiency). Based on these results, both extending working hours by one hour and adding labor showed the most efficient outcomes, but overall, adding labor was considered more optimal as it achieved the same acceleration with the lowest total cost.
Co-Authors Apriwelni, Siska Arif Rahman Hakim Sitepu Erdina Tyagita Utami Rajiman Siti Agmaliza Siti Rahma