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All Journal Jurnal Pensil : Pendidikan Teknik Sipil
Yerry Kahaditu Firmansyah
Study Program of Civil Engineering, Faculty of Engineering, Universitas Pembangunan Nasional “Veteran” Jawa Timur
Civil Engineering, Building, Construction & Architecture Education Other

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PENGARUH FLY ASH DAN FOSROC CEBEX-100 TERHADAP SIFAT MEKANIK TANAH LUNAK YANG DISTABILISASI Farah Salsabila Rahma; Yerry Kahaditu Firmansyah; Himatul Farichah
Jurnal Pensil : Pendidikan Teknik Sipil Vol. 14 No. 2 (2025): Jurnal Pensil : Pendidikan Teknik Sipil
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jpensil.v14i2.50625

Abstract

The problem of soft soil in infrastructure, specifically in road construction, will cause ongoing issues due to the nature of soft soil, which often undergoes shrinkage and swelling, potentially leading to failure in the structures above it. The solution of stabilizing the soil using chemical methods while also utilizing waste that is harmful to the environment has become very common, such as the use of fly ash material. This research focuses on the stabilization of soft soil using two stabilizing materials, namely fly ash and fosoc cebex-100, to improve the strength of problematic soil so that it can support the load of the construction above it. Fly ash was added  at 20%, 25%, and 30% of soil weight, and Cebex-100 at 0,45% of fly ash weight. The sample variations were subjected to physical tests, including Unconfined Compression Tests and shear strength tests, to determine the changes in physical and mechanical properties that occurred after the addition of the additives. The research results obtained from the unconfined compressive strength and elastic modulus parameters showed an improvement as the fly ash composition increased. The soil shear strength test identified 25% fly ash as the optimum variation, resulting in a cohesion value of 34.49 kN/m² and a friction angle of 7.66°. It can be concluded that the addition of fly ash and cebex-100 to problematic soil conditions can improve the physical and mechanical properties of the soil.
COMPARATIVE ANALYSIS OF ANALYTICAL RATIONAL METHOD IN CALCULATING BEARING CAPACITY OF PILE FOUNDATION BASED ON N-SPT DATA AGAINST CAPWAP TEST RESULTS PDA Al Firdaus Nawawi; Yerry Kahaditu Firmansyah; Himatul Farichah
Jurnal Pensil : Pendidikan Teknik Sipil Vol. 14 No. 3 (2025): Jurnal Pensil : Pendidikan Teknik Sipil
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jpensil.v14i3.53509

Abstract

This research aims to analyze the comparative value of analytical rational methods in calculating the bearing capacity of pile foundations based on N-SPT data. The results of calculating the bearing capacity of pile foundations by analytical methods (Luciano Decourt & Quaresma, Meyerhof, Nakazawa, Terzaghi & Peck, Reese O'Neil, and Vesic & Tomlinson) will be compared to the results of CAPWAP analysis of PDA (Pile Driving Analyzer) tests. The results of this study show that the Meyerhoff (1956) method provides the highest tip bearing capacity values, while the Nakazawa (2000) method produces the highest blanket bearing capacity and total bearing capacity values compared to other methods. Comparison of the ratio of total bearing capacity to CAPWAP showed a range of values from 0,82 to 1,64 with the Terzaghi & Peak (1948) methods providing the highest ratio. The methods with the smallest to largest average comparison values are Nakazawa (2000), Meyerhoff (1956); Luciano Decourt (1982) & Quaresma (1978); Vesic (1977) and Tomlinson (1977); Reese O'neil (1999); Terzaghi & Peak (1948) with average comparison values against CAPWAP of 0.81; 0.88; 1.14; 1.56; 1.57; 1.64 respectively. The comparison of the total bearing capacity of the analytical method to the CAPWAP analysis that is closest to 1 is the Meyerhoff (1956) and Luciano Decourt (1982) & Quaresma (1978) method. Therefore, the most effective analytical methods in calculating the total bearing capacity of piles are Meyerhoff (1956) and Luciano Decourt (1982) & Quaresma (1978) methods.
Co-Authors Al Firdaus Nawawi Farah Salsabila Rahma Himatul Farichah