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All Journal Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains RACIC : Rab Construction Research
puspa ningrum
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Civil Engineering, Building, Construction & Architecture Engineering

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PERILAKU STRES JALUR UJI TRIAKSIAL PADA TANAH LEMPUNG KARAWANG puspa ningrum
Racic : Rab Construction Research Vol 4 No 2 (2019): Desember
Publisher : LPPM Universitas Abdurrab

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Abstract

Generally, laboratory testing to determine the value of soil shear strength and stress path is triaxial test, especially for clay soil. In this research, the clay used for digital triaxial testing on axial compression (AC) stress path is Karawang clay soil, West Java, which have high plasticity (CH) in USCS classification. On pre-saturation process, a combination of vaccum and back pressure is used to speed up the saturation of the sample and to provide a high degree of saturation. Furthermore, the obtained soil parameters are used as inputs on finite element modeling which Mohr Coloumb and Hardening Soil model were used as the soil constitutive models. The results show that parameter optimization using hardening soil modeling has a behavior that is closer to the shape of the stress strain curve from laboratory tests.
Pengaruh Penambahan Air Di Atas Kadar Air Optimum Terhadap Nilai CBR Dengan Dan Tanpa Rendaman Pada Tanah Lempung Yang Dicampur Abu Terbang Puspa Ningrum; Soewignjo Agus Nugroho; Muhardi Muhardi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Clays are soft soil which have a low bearing capacity. One of the methods to determine the soil bearing capacity is CBR (California Bearing Ratio). Research on Laboratory for determining CBR value of soil generally performed on condition of optimum moisture content or fully saturated soil. This research evaluates the CBR value of clays with various fly ash contents from OMC to fully saturated. The results showed that, when the soil is compacted at OMC conditions, the effect of saturation resulted will decrease the CBR value up to 67% of CBR unsoaked. When soil is compacted with moisture content above the OMC, increase of water content resulted will decrease the CBR value up to 24%. Furthermore, the addition of fly ash content is effective to improve the CBR value between 20% -25%.  Key Words: CBR, water content, clay, fly ash
PENURUNAN KEKUATAN TANAH TERSTABILISASI PALM OIL FUEL ASH BERBASIS ALKALI AKTIVATOR MATERIAL DILINGKUNGAN GAMBUT Muhammad Toyeb; Husni Mubarak; Puspa Ningrum; Jefri Gunawan Tanjung
Racic : Rab Construction Research Vol 8 No 1 (2023): JUNI
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v8i1.3530

Abstract

Peat water contains low pH and acid caused corrosive on cementation structure as stabilized soil based alkali activated POFA. The soil samples mixed with different percentages of POFA (5%, 10%, and 15%) and alkali activator solution (sodium silica; Na2SiO3) and sodium hydroxide, NaOH) were immersed in peat water for various durations (0, 7, 14, and 28 days). The test results for the physical properties of the soil showed that the addition of POFA decreased the plasticity index and increased the optimum moisture content (OMC) while reducing the dry density (MDD) of the soil mixture. Furthermore, the unconfined compressive strength test indicated that the soil's strength increased at a 5% and 10% POFA content after 7 days of immersion, with strengths of 760 kPa and 1312 kPa, respectively. However, the strength significantly decreased by over 50% after 28 days of immersion, reached 365 kPa and 372 kPa for the respective POFA contents. A slight increase in soil strength was observed with the addition of 15% POFA content during the immersion period. Although the strength obtained after 28 days was almost the same for all mixtures at 356 kPa, higher levels of aluminosilicate synthesis as 15% POFA can enhance the bonding strength between soil particles, making the test specimen more resistant to acid attack.
Co-Authors Husni Mubarak Jefri Gunawan Tanjung Muhammad Toyeb Muhardi Muhardi Soewignjo Agus Nugroho