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All Journal Indonesian Research Journal on Education Jurnal Sains dan Teknologi ISTP
Sampurna, Henry
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KAJIAN PENGARUH PENAMBAHAN NANO SiO2 PADA NILAI KOHESI DAN SUDUT GESER DALAM TANAH LEMPUNG EKSPANSIF KARAWANG Oktaviani, Ike; Ngirtjuk, Ngirtjuk; Sampurna, Henry; Putra, Jon
Jurnal Sains dan Teknologi ISTP Vol. 21 No. 01 (2024): JULI
Publisher : LPPM ISTP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59637/jsti.v21i01.385

Abstract

Expansive clay soil is soil that has a high potential for shrinkage expansion and has a good bearing capacity under water-unsaturated conditions but poor under water-saturated conditions. So expansive clay soil has poor soil properties and is less profitable when used as the basis of a building construction. The results of data analysis tests it can be concluded that the cohesion value of expansive clay soil after adding a mixture of variations of Nano Silica Dioxide (SiO₂), namely original soil + Nano SiO₂ 2% = 33.03 kPa (increased 8.5%), original soil + Nano SiO₂ 3% = 46.26 kPa (up 21.73%), Natural soil + Nano SiO₂ 4% = 51.43 kPa (up 26.9%) Percentage of Nano Silica Dioxide (SiO₂) mixture is directly proportional to the soil cohesion value. The greater the percentage of Nano Silica Dioxide (SiO₂) mixture, the greater the cohesion value. The highest soil cohesion value is found in the 4% Nano Silica Dioxide (SiO₂) mixture. Changes in shear angle values ​​in expansive clay soil after adding a mixture of various polyamide fibers, namely original soil + Nano SiO₂ 2% = 26.57◦, original soil + Nano SiO₂ 3% = 29.36◦, original soil + Nano SiO₂ 4% = 32 .01◦. concluded that the percentage of Nano Silica Dioxide (SiO₂) mixture is directly proportional to the value of the friction angle in the soil. The greater the percentage of Nano Silica Dioxide (SiO₂) mixture, the greater the value of the internal friction angle. The highest internal shear angle value is found in the 4% Nano Silica Dioxide (SiO₂) mixture.
Evaluasi Estimasi Biaya Tahap Konseptual pada Proyek Pasar Ikan Modern (PIM) Muara Baru dengan Metode Parametrik Subagijo, Djoko; Sampurna, Henry; Putra, Jon; Hirwo, Ngirtjuk; Hasan, Draga
Indonesian Research Journal on Education Vol. 5 No. 1 (2025): Irje 2025
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/irje.v5i1.2053

Abstract

Penelitian ini bertujuan mengevaluasi estimasi biaya tahap konseptual terhadap nilai pagu anggaran pada pekerjaan konstruksi proyek pasar ikan modern (PIM) Muara Baru di Jakarta Utara, dan mencari parameter yang berpengaruh terhadap keakuratan estimasi biaya tahap konseptual. Data tersebut sebelumnya di uji validitas dan uji reabilitasnya, lalu setelah dinyatakan valid dan reliabel, dianalisis menggunakan metode RII (nilai relative important index) untuk menentukan peringkat faktor berpengaruh, dan untuk memaksimalkan hasil analisis agar mengetahui parameter apa saja yang berpengaruh pada keakuratan estimasi biaya, data tersebut dianalisis dengan regresi linier berganda. Metode parametrik menjadi model analisis biaya pilihan yang menghasilkan perkiraan biaya, durasi, dan upaya pada penelitian ini. Parameter yang berpengaruh berdasarkan berdasarkan hasil analisis regresi linier berganda yang telah dilakukan, keakuratan estimasi biaya (Y) rendah bila luasan lebih kecil atau sama dengan 400 m2 (X3.1).
Co-Authors Hasan, Draga Hirwo, Ngirtjuk Ngirtjuk, Ngirtjuk Oktaviani, Ike Putra, Jon Subagijo, Djoko