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Studi Daya Dukung Tanah Lempung Lunak yang Distabilisasi Menggunakan TX 300 Sebagai Lapisan Subgrade Muhammad Jafri; Iswan Iswan; Mirsa Susmarani
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 17, No 2 (2013): Edisi Agustus 2013
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Road construction requires good subgrade to put down parts of road pavement that it put downabove subgrade. However, soil can make problem if it has bad characteristic and loss, forexample high plasticity, low shear strenght, compression or volume change and large potensial ofswelling-shrinking. To overcome these, it is needed an improvement of soil that is called with soilstabilization use additive and one of them use TX 300 that come from America.Results of laboratory research show stabilization materials use TX 300 as stabilizing agent canimprove the physical and mechanical properties of soft clay soil. On physical test such as specificgravity and plasticity index, it decreased after stabilization. While the mechanical testing, usage ofTX 300 is effective enough in increasing the bearing capacity of soft clay soil. From the testresults of laboratory’s CBR, soil that has been stabilized with a mixture of the TX 300 can be usedas a subgrade for road construction due to CBR’s value ≥ 6 %.
Pengaruh penambahan clean set cement (C5-20) pada stabilitas tanah gambut ditinjau dari nilai permeabilitas Muhammad Jafri
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 16, No 1 (2012): Edisi April Tahun 2012
Publisher : UNIVERSITAS LAMPUNG

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Salah satu alternatif bahan tambah yang digunakan untuk stabilisasi adalah menggunakan sistemsoil cement, dimana yang digunakan untuk bahan stabilisasi adalah clean set cement. Stabilisasitanah dengan menggunakan sampel tanah gambut (peat) di Propinsi Lampung dengan bahanclean set cement dilakukan dengan studi penyelidikan di laboratorium dengan pengujian beratjenis, pengujian batas atterberg, pengujian kepadatan, pengujian permeabilitas untuk mengetahuinaiknya kekuatan tanah gambut sebagai lapisan tanah dasar. Penelitian yang dilakukan denganmenggunakan 3 macam campuran: (a) Tanah gambut + 4% clean set cement, (b) Tanah gambut +8% clean set cement dan (c) Tanah gambut + 12% clean set cement. Hasil penelitianlaboratorium mekanika tanah menunjukkan bahwa peningkatan maksimum daya dukung tanahterdapat pada campuran tanah gambut ditambah 12% clean set cement dengan 14 hari waktupemeraman (delay time). Peningkatan kekuatan tanah dapat dilihat dari hasil pemadatan tanahyang semula memiliki kadar air optimum sebesar 62% turun menjadi 55,8%, berat isi keringtanah meningkat dari semula sebesar 0,676 gr/cm3 naik menjadi 0,770 gr/cm3, dan koefisienpermeabilitas yang semula 6,031 x 10-5 cm/detik turun menjadi 0,883x10-5 cm/detik. Peningkatankekuatan tanah tersebut disebabkan terjadinya pengikatan antara butiran-butiran tanah olehcampuran clean set cement dan lamanya waktu pengikatan dengan pemeraman. Hasil penelitianmenunjukkan bahwa tanah akan terus meningkat kestabilannya sampai pada batas optimumapabila kadar clean set cement ditambah atau dipakai clean set cement seri CS 20 (untuk tanahorganik tinggi dan gambut) dan waktu pemeramannya lebih lama.
PERBAIKAN PENGEMBANGAN TANAH MENGGUNAKAN ZAT ADDITIVE KAPUR DENGAN PEMODELAN ALAT KONSOLIDASI Muhammad Jafri
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 13, No 3 (2009): Edisi Desember Tahun 2009
Publisher : UNIVERSITAS LAMPUNG

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Abstract

There are lot of benefits can be obtained from lime, as mixture or filler, even it can be use as soilstabilization agent that is for clay stability. The experiment’s purpose is to know swelling andswelling pressure of clay when the addiction of lime applied. Test conducted in three phases, (1).physical test for clay and soil - lime mixture; (2). compaction test with modified proctor, and (3).swelling and swelling pressure test with load multiple of 17,67 kg. The soil sample is clay broughtfrom Gumbib Village at West Lampung and mixed with lime at 5%, 10%, and 15%. The resulttest that, the soil sample is classified in soft clay category (AASHTO and Unified). Another resultobtained that the usage of lime with certain procentage very effect to swelling and swellingpressure of clay. The addiction of lime applied, the swelling and swelling pressure of clay isdecreased. So it can be concluded that lime can be used as clay stabilizer.
Studi Sifat Fisik Tanah Organik yang Distabilisasi Menggunakan Cornice Adhesive Iswan .; Muhammad Jafri; Adi Lesmana
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 17, No 2 (2013): Edisi Agustus 2013
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Analysis of the data in this study is focused on a comparison of the results of direct testingdeflection field with SAP 2000 analysis and manual calculation of loading field and standard(RSNI T-02-2005) with a maximum deflection limit bridge.Based on the results obtained by calculation of loading field: percentage reduction of deflectiontest results without the GFRP reinforcement compared to after given the GFRP reinforcement ondirect testing field, SAP 2000 analysis, and manual calculation respectively, they are obtained4.934 %, 0.7097%, and -0,6804 %. Based on the results of the calculation deflection of theloading standard: percentage reduction of deflection test results without the GFRP reinforcementcompared to after given the GFRP reinforcement on SAP 2000 analysis and manual calculationrespectively, they are obtained 2,0212 % and -0.17557 %. The Values of deflection are calculatedstill below 18.75 cm as deflection limit L/240.
Co-Authors Adi Lesmana Albertus Willy Pratama Bravo Pandiangan Dony Rizky Pratama Ferdi Ferdian hardianto widyastomo Iswan . Iswan Iswan Markus Manik Mirsa Susmarani Natanael Sembiring Putra Andrean A. Roy Pramana Yusuf Setyanto Setyanto Taufik Ramadhani Yohanes Martono Hadi