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Okrobianus Hendri
Program Studi Teknik Sipil, Fakultas Teknik, Universitas Palangka Raya
Engineering

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PENGARUH CAMPURAN ABU TERBANG (FLY ASH) DAN ASAM FOSFAT TERHADAP DAYA DUKUNG TANAH LEMPUNG Muhammad Reza Pratama; Okrobianus Hendri; M. Ikhwan Yani
INFO-TEKNIK Vol 23, No 2 (2022): INFOTEKNIK VOL. 23 NO. 2 DESEMBER 2022
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v23i2.14511

Abstract

Based on observations in the field, the village of Tanjung Sanggalang is dominated by clay soil. Construction on clay soil, if not handled properly, can affect the construction on clay and can accelerate damage after the construction is completed. The alternative used to improve clay soil to make it more stable is soil stabilization using a mixture of fly ash and phosphoric acid. The purpose of this study was to analyze the physical properties of the soil and to analyze the bearing capacity of the soil before adding fly ash (A.T.) with phosphoric acid (A.F) and adding fly ash (A.T.) with phosphoric acid (A.F). The percentage of mixture for fly ash ash is 7.5% and for phosphoric acid the percentage of mixture is 5%, 7.5%, 10%. Based on the results of the study, the variation of the mixture experiencing changes in the bearing capacity of the highest soil is clay with a mixture of A.T. 7.5% and A.F. 10% of the yield, fly ash and phosphoric acid can increase the bearing capacity of clay soil.
STABILISASI TANAH LEMPUNG MENGGUNAKAN CAMPURAN GYPSUM DAN GARAM DAPUR TERHADAP KUAT GESER DAN DAYA DUKUNG TANAH Dion Wiratama; Okrobianus Hendri; Fatma Sarie; Eka Putri Setiati
INFO-TEKNIK Vol 23, No 2 (2022): INFOTEKNIK VOL. 23 NO. 2 DESEMBER 2022
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v23i2.14561

Abstract

Tanah memiliki peranan penting dalam berbagai macam pekerjaan konstruksi bangunan dan jalan karena tanah berfungsi sebagai dasar pondasi yang meneruskan beban diatasnya. Tanah lempung merupakan salah satu jenis tanah yang memiliki daya dukung rendah atau buruk, yang dapat menyebabkan penurunan bangunan dan jalan. Penelitian ini bertujuan untuk mengetahui sifat fisis tanah, sifat mekanik tanah dan untuk mengetahui pengaruh penambahan campuran dan pengawetan tanah terhadap daya dukung (qu) dan kuat geser tanah (τ) pada lempung. disubstitusi dengan campuran gipsum dan garam meja dengan variasi 0%, 5%, 7,5%, dan 10% dan waktu pemeraman 0 dan 4 hari. Berdasarkan hasil pengujian sifat fisis tanah, nilai persentase tanah yang lolos saringan No. 200 adalah 56,04% > 50%, nilai batas cair (LL) = 42,91%, indeks plastisitas (IP) = 20,07% dan GI = 9%. Berdasarkan klasifikasi USCS, dapat disimpulkan bahwa tanah yang diuji termasuk dalam kelompok CL (lempung anorganik) dengan plastisitas rendah sampai sedang. Berdasarkan klasifikasi AASHTO, tanah tersebut termasuk dalam kelompok A-7-6 (9) atau tergolong tanah lempung dengan kondisi sedang sampai buruk. Hasil pengujian sifat mekanik diperoleh nilai daya dukung tanah asli yaitu qult = 1,1835 kg/cm2 dan meningkat sebesar 236,91% menjadi, qult = 3,9874 kg/cm2 setelah penambahan campuran 10% yang terdiri dari 7,5 % gypsum dan 2,5% garam meja dengan 4 hari pengawetan. Pada uji geser langsung diperoleh kuat geser tanah asli yaitu (τ) = 0,1489 kg/cm2 dan turun sebesar 4,65% menjadi (τ) = 0,1356 kg/ cm2
PASIR DAN JANJANG KOSONG KELAPA SAWIT SEBAGAI STABILITATOR TANAH LEMPUNG TERHADAP KUAT GESER DAN DAYA DUKUNG TANAH Febri Nepi Suwendi; Fatma Sarie; Okrobianus Hendri; Eka Putri Setiati
INFO-TEKNIK Vol 23, No 2 (2022): INFOTEKNIK VOL. 23 NO. 2 DESEMBER 2022
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v23i2.14599

Abstract

This study used a mixture of clay, sand and Empty fruit bunch of palm oil with the percentage addition of 5%, 7.5%, 10%. The results of physical properties testing carried out on clay taken from Tanjung Sanggalang Village, Central Kahayan District, Pulang Pisau Regency, Central Kalimantan Province. It has values such as, Water Content (w) = 40.77%, Soil Density (γ) = 1.67 gr/cm3, Specific Gravity (Gs) = 2.73, Atterberg limits, namely Liquid Limit = 42.74%, Plastic Limit = 22.68%, Plasticity Index = 20.06%, Shrinkage Limit = 13.15%. According to the USCS classification system, based on the results of the sieve analysis examination, the percentage of material passing sieve no. 200 ( 0.075 mm) is 64.90% > 50% then the soil is a fine grained soil. Based on the Atterberg examination the soil was classified as clayey and included in the CL group with low to moderate plasticity, and according to AASHTO the soil was classified as loamy with loamy soil conditions with moderate to poor conditions and included in group A-7-6 (11) . From the results of the direct shear test of the soil obtained, the shear angle (⌀) = 12.13, cohesion (c) = 0.1406 Kg/ cm2 and the results of the Unconfined Compression test obtained, Unconfined Compression Test (qu) = 0.460 Kg/ cm2 , soil shear cu) = 0.230 kg/ cm2.
Co-Authors Dion Wiratama Eka Putri Setiati Febri Nepi Suwendi M. Ikhwan Yani Muhammad Reza Pratama