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Studi Kekuatan Batu Bata Pasca Pembakaran Dengan Menggunakan Bahan Additive Serbuk Gergaji Kayu Setyanto Setyanto; Iswan Iswan; Hari Diantoro Rahmad
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 2 (2015): Edisi Agustus 2015
Publisher : UNIVERSITAS LAMPUNG

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The Increasing construction in Indonesia and the number of population which is increasing every year must be supported by better economy growth. Thus, the construction materials will continue to increase to support the needs of infrastructure construction. To support the development and growth, then brick as a construction material will be needed. One of the method that can be used to improve the quality of the soil material is to use mixing ingredients (additives) such as sawdust to facilitate the combustion process and as a pore-forming on bricks. Based on the explanation above , it is necessary to do an objective study of making bricks, so that sawdust can be used as an right mix alternative in the manufacture of bricks, in the hope of sawdust waste is not wasted, but it can add power to brick and can produce bricks with good quality. Soil samples were tested in this study is a fine-grained soil from the Yosomulyo village, East Metro District, Metro City. Variations in the levels of the mixture used is 5%, 10%, 15% and 20%, with a curing time of 14 days as well with post-combustion treatment on the brick. Based on the results of physical testing of the original soil, USCS classified the soil samples as fine-grained soil and included in the ML group. This study used additive materials, such as wood sawdust mixture, on the mixture of 5% level, red brick experienced an escalation compared to bricks that are not mixed with additive materials. At the levels of a mixture of 10%, 15% and 20%, bricks decreased, both in terms of compressive strength and quality of bricks. So, in a mixture of 10%, 15% and 20%, the brick is not recommended for use as a building material because it does not fit to the requirements of SNI 15- 2094-2000 and water absorption rate is only 15% the level of compliance with the standards between 14% to with 18%.

PENGARUH KUAT TEKAN DAN KUAT GESER SAMPEL DRYSIDE OF OPTIMUM (KERING OPTIMUM) DAN WETSIDE OF OPTIMUM (BASAH OPTIMUM) PADA TANAH LEMPUNG Lumeilia Afriani; Iswan Iswan; Armen Febri
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 3 (2015): Edisi Desember 2015
Publisher : UNIVERSITAS LAMPUNG

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Clay is a type of soil with low bearing capacity, the water is very large influence on the physical and mechanical behavior. Clay in the dry state optimum swell properties that are larger than the current optimum wet clay compacted. This is because at the time of clay in the dry state of opti - mum relative shortage of water so that the clay has a greater ability to absorb water. In experi - ments clay in dry conditions and wet optimum optimum useful to know the carrying capacity of the soil in dry and wet conditions. From the results of research conducted generate free compressive strength value (qu) and the value of cohesion (c) and the maximum shear strength soil in wet conditions the optimum moisture content, dry optimum and optimum. In optimum conditions produce the highest value for the com- pressive strength of free, direct shear strength and cohesion values. This is because the optimum conditions the maximum soil density, so that the soil is not easily mengemang. In dry conditions the optimum clay soil density unstable, so that the grains of soil are not mutually binding, whereas in wet conditions the optimum pressure on the grains of soil is very high, so that the soil has a high plasticity.

PENGARUH WAKTU PEMERAMAN TERHADAP DAYA DUKUNG STABILISASI TANAH LEMPUNG BERPASIR MENGGUNAKAN TX-300 Andius Dasa Putra; Iswan Iswan; S Effendy
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 18, No 3 (2014): Edisi Desember 2014
Publisher : UNIVERSITAS LAMPUNG

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Road is one of many things that support the development of construction at citties and villages. Not every soil can be directly used for road construction. Soil conditions in one area will not have the same soil properties with the other area. Some has a good bearing capacity and there’s also some with poor soil bearing capacity. This thing is very influenced by the type of the soil, so that on constructionis is requred a deeper understanding of the soil behavior analytically. In this research, the tested soil is study clay soil that diviced from Dusun kali ayu, Desa jadti baru, Kecamatan tanjung bintang, Kabupaten Lampung Selatan-Provinsi Lampung had been optimized with TX-300 with density of 2.49, water contents of 22.34 percent, 41.08 percent Liquit Limit, plastic limit of 31.92 percent and plasticity index of 9.15 percent. Mixed content of TX-300 that used was 1.2 ml and 6 kg soil sample for 0,7,14 and 28 day with unsoaked method. On physical examination like density and liquit limit increased after stabilized. While the mechanical examination, TX-300 is quite effective in increasing the bearing capacity along with the increasing of curing duration from 21.69% up to 25.92% in 28 days curing time. From CBR test result without soaking , the soil that has stabilized with TX-300 has a less effect in increasing the bearing capacity of the sandy clay soil compared with of stabilizing on soft clay soil.

KORELASI HUBUNGAN SIFAT MEKANIK DAN INDEKS PLASTISITAS PADA BATU BATA DENGAN CAMPURAN ABU CANGKANG SAWIT Iswan Iswan; Aminudin Syah; Muhammad Nasih Ulwan
Jurnal Teknik Sipil Vol 17, No 1 (2026): April
Publisher : Universitas Bandar Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36448/jts.v17i1.4671

Pemanfaatan abu cangkang kelapa sawit (ACS) merupakan salah satu metode potensial untuk perbaikan mutu bata merah konvensional melalui modifikasi pada sifat-sifat mekaniknya. Penelitian ini bertujuan menganalisis hubungan antara sifat mekanik pada batu bata yang dicampur abu cangkang sawit (ACS), serta mengkaji peran indeks plastisitas (IP) tanah terhadap sifat-sifat tersebut. Metode pembuatan batu bata menggunakan dua metode yaitu batu bata lapangan dan batu bata kadar air optimum (KAO) dengan berbagai variasi ACS (0%, 4%, 6%, 8%, dan 10%), yang kemudian diuji sifat mekaniknya. Tujuan dari penelitian ini adalah mendapatkan korelasi hubungan antar sifat mekanik dan indeks plastisitas terhadap peningkatan kualitas batu bata campuran abu cangkang sawit (ACS). Hasil penelitian menunjukkan korelasi yang kuat antar sifat mekanik. Terdapat hubungan positif antara kerapatan semu dan kuat tekan, serta hubungan negatif antara daya serap air dengan kuat tekan dan kerapatan semu. Secara signifikan, ditemukan bahwa sifat mekanik optimal dengan kuat tekan maksimum (52,43 kg/cm²), kerapatan semu tertinggi (1,65 gram/cm³), dan daya serap air terendah (16,80%) tercapai secara konsisten pada nilai indeks plastisitas 14,50%, yang bertepatan dengan campuran 6% ACS. Peningkatan indeks plastisitas hingga titik optimal ini secara signifikan meningkatkan kualitas batu bata, namun penambahan ACS lebih lanjut yang mengubah indeks plastisitas melewati titik ini justru menurunkan performa mekaniknya, menunjukkan bahwa indeks plastisitas salah satu parameter kunci yang menentukan keberhasilan penggunaan ACS sebagai bahan campuran dalam pembuatan batu bata.

Studi Model Cerucuk Ferosemen Berlubang Terhadap Kapasitas Beban di Atas Tanah Lunak Masdar Helmi; ardi elsa brina; Fikri Alami; Iswan Iswan
Teras Jurnal : Jurnal Teknik Sipil Vol. 12 No. 2 (2022): Volume 12 Nomor 2, September 2022
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v12i2.715

Abstrak Cerucuk ferosemen merupakan salah satu ide yang bisa dijadikan alternatif mengatasi permasalahan tanah lunak akibat rendahnya daya dukung terhadap beban di atasnya. Penelitian ini bertujuan untuk menganalisis kapasitas model cerucuk ferosemen terhadap beban aksial di atas tanah lunak ditinjau dari batas penurunan maksimum 2,54 cm. Terdapat 3 macam kondisi pengujianyaitu cerucuk tunggal berlubang, cerucuk tunggal tertutup dan cerucuk kelompok tertutup pada ujungnya (4 buah silinder). Variasi pengujian cerucuk tunggal berupa lama waktu di dalam tanah lunak, yaitu 1, 3, 7, dan 14 hari. Hasil pengujian dibandingkan dengan perhitungan teoritis. Deformasi dan tegangan tanah lunak dianalisis menggunakan metode elemen hingga. Hasil pengujian menunjukan bahwa kapasitas terhadap beban meningkat seiring dengan bertambah lamanya perendaman. Pada variabel 14 hari, kapasitas maksimum cerucuk tunggal berlubang sebesar 0,80 kN dan meningkat drastis pada cerucuk tunggal tertutup sebesar 3,53 kN terjadi peningkatan signifikan sebesar 77,33%. Sedangkan kapasitas cerucuk kelompok tertutup memiliki kapasitas sebesar 9,91 kN. Kata kunci: Cerucuk ferosemen, tanah lunak, kapasitas dukung (q ultimit), faktor aman, FEM (Finite Element Method). Abstract Ferrocement pile is an idea to overcome the problem of soft soil which has a low bearing capacity to the load.. This study aims to analyze the bearing capacity of the ferrocement pile model against axial loads on soft soil in terms of the maximum settlement limit of 2.54 cm. There were three conditions of testing: single pile with a hollow at the bottom, single pile closed at the bottom, and group pile closed at the bottom. The variations of the test were the length of immersed in soft soil, namely 1, 3, 7, and 14 days. The deformation and stress were analyzed using a software of FEM (Finite Element Method). The test results show that the capacity of ferrocement pile to the load increases with the increase in the duration of immersion. In the 14-day variable, the maximum capacity in a single hollow ferrocement pile was 0.80 kN and increased significantly in a single closed ferrocement pile of 3.53 kN, or 77.33%. Meanwhile, the group closed ferrocement pile had a capacity of 9.91 kN. Keywords: Ferrocement pile, soft soil, bearing capacity (Q ultimate), safety factor, FEM (Finite Element Method).

Pengaruh Pemakaian Difa Soil Stabilizer Terhadap Daya Dukung Tanah Lempung Untuk Konstruksi Jalan Iswan Iswan; Muhammad Karami; I Wayan Diana
Teras Jurnal : Jurnal Teknik Sipil Vol. 14 No. 2 (2024): Volume 14 Nomor 2, September 2024
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v14i2.1150

Abstrak Tujuan penelitian adalah melihat pengaruh penambahan bahan difa soil stabilizer terhadap daya dukung dan potensi pengembangan tanah lempung. Tanah lempung berasal dari Lampung Selatan, dibagi menjadi lima variasi penambahan bahan tambah: variasi 1 (tanah asli), variasi 2 (tanah asli ditambah 8% semen dan 0% difa), variasi 3 (tanah asli ditambah 4% semen dan 3% difa), variasi 4 (tanah asli ditambah 6% semen dan 3% difa) dan variasi 5 (tanah asli ditambah 8% semen dan 3% difa). Untuk pengujian CBR, setiap variasi diberikan empat perlakuan yaitu pemeraman empat hari, pemeraman tujuh hari, pemeraman 14 hari, dan pemeraman empat hari dilanjutkan perendaman empat hari. Sedangkan untuk pengujian potensi pengembangan, benda uji direndam selama empat hari sebelum dilakukan pengujian. Hasil penelitian menunjukkan penambahan difa soil stabilizer meningkatkan nilai CBR tanpa atau dengan rendaman untuk semua perlakuan dan menurunkan potensi pengembangan lempung. Dengan demikian dapat mengurangi ketebalan lapisan pondasi struktur perkerasan jalan. Kata kunci: difa soil stabilizer, sifat mekanik, stabilisasi, tanah lempung. Abstract The objective of this study was to investigate the effect of difa soil stabilizer on the bearing capacity and swell potential of clay. The clay was divided into five variations: variation 1 (clay only), variation 2 (clay plus 8% cement and 0% difa), variation 3 (clay plus 4% cement and 3% difa), variation 4 (clay plus 6% cement and 3% difa) and variation 5 (clay plus 8% cement and 3% difa). For the CBR test, each variation was given four treatments, namely four-day curing, seven-day curing, 14-day curing, and four-day curing followed by four-day soaking. As for the swell potential test, the specimens were soaked for four days before testing. The results showed that the addition of difa soil stabilizer increased the CBR value without or with soaking for all treatments and decreased the clay swell potential, thereby reducing the thickness of the foundation layer of the pavement structure. Keywords: clay, difa soil stabilizer, mechanical characteristics, stabilization

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