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Studi Daya Dukung Tanah Lempung Plastisitas Rendah Yang Distabilisasi Menggunakan TX-300 Sebagai Lapisan Subgrade Syafri, Erwan; Jafri, Muhammad; Afriani, Lusmeilia
Jurnal Teknik Sipil Vol 3, No 2 (2012): Oktober
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Soil is a material that serves as an support for the basis of a constuction, be it construction of buildings, bridges and roads. Each region has different soil characteristics in other regions, there is good and has a bearing capacity of those that are poor. To improve the soil characteristics that can lead to por bearing capacity, the necessary repairs to soil stabilization methods. Stabilization efforts are often undertaken by stabilizing additives. In this research using a chemical additive material that is TX-300, which is expected to improve the characteristics of the soil so the soil is worthy of a construction established. Soil samples that tested in this research is the low plasticity clay are derived from Karang Anyar, South Lampung. Variation levels used ia a mixture of 0,8 ml; 1,1 ml; 1,4 ml and 1,7 ml with the same curing time for 7 days and soaking for 4 days. Based on the examination of the physical properties of original soil, AASHTO classify soil samples in group A-6 (clay soil), while the USCS soil samples classify as fine-grained soil and included into the CL group. The results of laboratory research showed that the stabilizing agent TX-300 can improve the physical and mechanical properties of low plasticity clay. On physical testing such as decreased specific gravity and atterberg limits increase after stabilized. While the mechanical testing, a mixture of TX-300 can increase the bearing capacity of the land. From the test results of CBR soaked or unsoaked, soil stabilized with a stabilizing agent TX-300 at optimum levels can be used as a subgrade for road construction due to CBR value = 6 %Tanah merupakan material yang berfungsi sebagai penyokong dasar suatu konstruksi, baik itu konstruksi gedung, jembatan maupun jalan. Setiap daerah memiliki sifat tanah yang berbeda dengan daerah lainnya, ada yang mempunyai daya dukung baik dan adapula yang buruk. Untuk memperbaiki sifat tanah yang dapat mengakibatkan daya dukung menjadi buruk, maka diperlukan perbaikan tanah dengan metode stabilisasi. Usaha stabilisasi yang banyak dilakukan adalah stabilisasi dengan bahan tambahan. Pada penelitian ini menggunakan bahan additif kimia yaitu TX-300 yang diharapkan mampu memperbaiki sifat tanah sehingga pada lapisan tanah tersebut layak didirikan suatu konstruksi. Sampel tanah yang di uji pada penelitian ini yaitu tanah lempung plastisitas rendah yang berasal dari daerah Karang Anyar, Lampung Selatan. Variasi kadar campuran yang digunakan yaitu 0,8 ml; 1,1 ml; 1,4 ml dan 1,7 ml; dengan dilakukan waktu pemeraman yang sama selama 7 hari dan perendaman selama 4 hari. Berdasarkan pemeriksaan sifat fisik tanah asli, AASHTO mengklasifikasikan sampel tanah pada kelompok A-6 (tanah berlempung),sedangkan USCS mengklasifikasikan sampel tanah sebagai tanah berbutir halus dan termasuk kedalam kelompok CL. Hasil penelitian di laboratorium menunjukkan bahwa bahan stabilisasi TX-300 dapat memperbaiki sifat fisik dan mekanik tanah lempung plastisitas rendah. Pada pengujian fisik seperti berat jenis mengalami penurunan dan batas-batas Atterberg mengalami kenaikan setelah distabilisasi. Sementara pada pengujian mekanik, campuran TX-300 dapat meningkatkan daya dukung tanah tersebut. Dari hasil pengujian CBR rendaman atau tanpa rendaman, tanah yang distabilisasi dengan bahan stabilisasi TX-300 pada kadar optimum dapat digunakan sebagai tanah dasar pada konstruksi jalan dikarenakan nilai CBRnya = 6 %.
Korelasi Kuat Tekan Bebas dengan Kuat Geser Langsung pada Tanah Lempung yang dicampur dengan Zeolit Hermawan, M. Iqbal; Afriani, Lusmeilia; Iswan, Iswan
Jurnal Rekayasa Sipil dan Desain Vol 3, No 1 (2015): Edisi Maret 2015
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This research was conducted to determine the effect between zeolite and clay of compressivestrength and shear strength. Construction founded on clay will cause some impact, such as lack ofcompressive strength and shear strength. Therefore, before the construction of structures on theclay, the clay must be stabilized first. In this research, soil stabilization using zeolite.Based on the results of this research there was an increase in the compressive strength of clay by94,5 % from 0,2975 kg/cm 2 be 0,5787 kg/cm 2 , and improving the clay cohesion of 54,17 % from0.24 kg/cm 2 be 0,36 kg/cm 2 , and the increase in the maximum shear strength of 43,89 % of 0.4754kg/cm 2 be 0,6841 kg/cm 2 , the additon of zeolite until 10%. From these values it can be concluded,compressive strength and shear strength increases as a percentage addition of zeolite, althoughthe increase that occurred in the unconfined compressive strength and direct shear strength is notas great.Keywords : Clay, Zeolite, Uncofined Compressive Strenght, Shear Strenght
MENENTUKAN PERBANDINGAN DERAJAT KEPADATAN TANAH  MUNGGUNAKAN ALAT UJI TEKAN MODIFIKASI METODE STANDAR DENGAN ALAT UJI PROCTOR STANDAR Hidayatulloh, Anwar; Afriani, Lusmeilia; Setyanto, Setyanto
Jurnal Rekayasa Sipil dan Desain Vol 6, No 1 (2018): Edisi Maret 2018
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Tanah memegang peranan penting dalam infrastruktur untuk mencapai infrastruktur yang kokoh, tanah di sumatera memiliki dataran yang tidak rata, sehingga membutuhkan tanah untuk timbunan agar mendapatkan ketinggian tanah yang direncanakan. Timbunan memerlukan pemadatan tanah agar dapat benar-benar kuat dan stabil terhadap beban struktur maupun beban non struktur. Pada  penelitian ini adalah menentukan perbandingan derajad kepadatan tanah menggunakan alat uji tekan modifikasi dengan alat uji standar proctor. Penelitian ini menggunakan sampel tanah yang berasal dari daerah Gedung Agung Kec. Jati Agung, Lampung Selatan. Pelaksanaan pengujian alat tekan pemadat modifikasi dengan menggunakan empat sampel tanah pada masing-masing tekanan, tekanan yang digunakan yaitu 1,66 MPa, 6,2 MPa, 7 MPa dan 8,4 MPa.Berdasarkan hasil dari pengujian sifat-fisik dan mekanis, tanah digolongkan sebagai kelompok tanah A-2-4 yaitu tanah pasir berlempung. Pengujian dari uji pemadatan tanah menggunakan standard proctor didapatkan nilai 1,62 gr/cm3 dan nilai berat volume kering menggunakan uji alat tekan modifikasi didapatkan hasil 1,6234 gr/cm3, sehingga dengan hasil yang didapatkan alat uji tekan modifikasi dapat dipakai untuk menggunakan pengujian  uji pemadatan di laboratorium.
Korelasi antara Kuat Tekan Bebas dengan Kuat Tekan Geser langsung pada Tanah Lanau Disubstitusi dengan Pasir Sudarman, Aulia R; Afriani, Lusmeilia; Iswan, Iswan
Jurnal Rekayasa Sipil dan Desain Vol 4, No 2 (2016): Edisi Juni 2016
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This study aims to get the correlation between the soil compressive strength and soil shearstrength directly on silt substituted with granulated materials. This is done because if buildingstructures on the silt soil will cause several problems including a small value of the compressivestrength and low shear strength after incurring. For the testing is done with a mixture of sand, siltsoil so that it can be seen how much sand mixture to resist the forces on the load that is above theground.To determine the sand effect on silt soil , with the compressive strength and shear strength that hasbeen made by way of mixing the sand by 10%, 20%, 30% and 40%. From the test results showedan increase in the compressive strength of 0.3723 kg/cm 2 in a mixture of 10% sand and a decreasein the mixture thereafter. In the direct shear strength value increased 30% when variations mixtureof sand that is equal to 0.4290 kg / cm 2 , the cohesion of 0.27 kg / cm 2 and the friction angle in at26.170.Keywords: silt soil, sand, soil compressive strength, soil direct shear
Pengaruh Variasi Waktu Pemeraman Terhadap Nilai Uji Kuat Tekan Bebas pada Tanah Lempung dan Lanau yang Distabilisasi Menggunakan Kapur pada Kondisi Optimum Hafizh Arrofiq, Abdil; Afriani, Lusmeilia; Iswan, Iswan
Jurnal Rekayasa Sipil dan Desain Vol 4, No 3 (2016): Edisi September 2016
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In this study used raw material such as silt and clay soil with a mixture of lime additive which has a variety of levels of 5%, 10%, and 15% as well as with a variety of curing time for 7 days, 14 days and 28 days.The purpose of this study to increase the compressive strength of silt and clay soil free them. Soil samples tested in this study represents silt soil from the village Yosomulyo, East Metro District, Metro City, while the clay is derived from Rawa Sragi, Jabung District, East Lampung regency.After doing research, from the third level, the compressive strength maximum free of silt and clay soil found in the levels of 15% with 28 days curing time. This is due to the greater levels of lime and the longer the curing time, the greater the unconfined compression value.Keywords: Clay Soil, Silt Soil, Unconfined Compression, lime.
Studi Dan Analisa Campuran Tanah Lempung Dan Abu Sekam Padi Terhadap Nilai Permeabilitas Dengan Alat Falling Head Setiawan, Dedi; Afriani, Lusmeilia; Setyanto, Setyanto
Jurnal Rekayasa Sipil dan Desain Vol 3, No 3 (2015): Edisi September 2015
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Soil permeability value for every construction is different. Such differences affect the strength of acivil construction to be built. Therefore it is necessary to attempt to manipulate the soilpermeability value by adding the additive to a soil permeability values obtained in order to meetthe standard of civil construction to be built. Among the many additives are used as soilstabilization materials, one of them is rice husk ash. Some recent researches in the field of CivilEngineering showed that rice husk ash mixture useful as a particularly clay soil stabilization.Because rice husk ash can fill the cavities that exist between the grains of ground.Soil samples tested in this study is clay derived from Perumahan Bhayangkara, KelurahanBeringin Jaya, Kecamatan Kemiling, Bandar Lampung. Rice husk ash used were obtained fromDusun Dantar, Kecamatan Padang Cermin, Kabupaten Pesawaran. This study was conducted todetermine the effect of rice husk ash to the soil permeability values.The results of analysis and calculations performed in the laboratory obtained averagepermeability value (k) for soil with 5% rice husk ash added, 10% rice husk ash added, and 15%rice husk ash added. The permeability value used to be compared with native soil (clay).Key words: clay, rice husk ash, permeability.
Studi Analisis Daya Dukung Tanah Lempung Berplastisitas Tinggi yang Dicampur Zeolit Alfian, Rian; Afriani, Lusmeilia; Iswan, Iswan
Jurnal Rekayasa Sipil dan Desain Vol 3, No 2 (2015): Edisi Juni 2015
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C lay has properties that are not profitable for construction. This is because the bearing capacityof the soil or low CBR have low value. Therefore we need a stabilizing agent that can reduce soilproperties which are unprofitable, usually accompanied by binding to each soil grain with theother .The research was done by testing on clay samples without a mixture and the clay that is mixedwith zeolite with a variation of 6%, 8%, 10%, 12% and 14%. Tests were performed using standardand modified compaction which previously done curing for 14 days. After compaction test, thesamples were soaked for 4 days and then followed by mechanical testing which is CBR test thataimed to determine the bearing capacity value of the soil after the sample was mixed by zeolites.Based on the results of laboratory research, the highest value obtained on the sample CBR claywith a mixture of 14% zeolite with the use of modified compaction with 14 days of curingand 4days of soaking in the amount of 2.78%. This is because the effect of zeolite which can bind clayparticles. So, the more a mixture of zeolite then bearing capacity of the soil also increasing.However, the value of CBR in this research can not be used as subgrade in road constructionbecause of its CBR value ≤ 6%.Keywords: CBR, Soil Clay, Zeolite
Pengaruh Fraksi Lempung Terhadap Nilai Kohesi dan Indeks Plastisitas Rambe, Renold Pangidoan; Afriani, Lusmeilia; Iswan, Iswan
Jurnal Rekayasa Sipil dan Desain Vol 4, No 2 (2016): Edisi Juni 2016
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This study aims to see the influence the fraction of clay in the sand by comparing parameters ofstrong shear soil that is resulted from unsoaked and soaked conditions of Direct Shear Test andAtterberg Limit. An increase in the fraction of clay in the sand can change the physical propertiesof the soil and the mechanical properties. An increase in the fraction of clay can also improve thevalue soil cohesion and ground plasticity index but it reduces the value soil friction. Theparameter change magnitude is analyzed by looking at the results of correlation analysis ofcohesion of the soil plasticity index, and some of the physical parameters of the soil. Thecorrelation between the shear test directly with the plasticity index against the physical propertiesof soil clays that linear regression obtained a very strong correlation (0.8 – 1) and limit land thatis used are sand which is already substituted by clays from 0% – 50%.Direct shear test which results from the condition of unsoaked conducted in the laboratoryobtained that addition levels of clay showed an increase in the value of cohesion but the angleshear declined. Direct shear test results from the condition of soaked (soaking 4 days) obtained adecrease of the value of cohesion (c) down and slide angle (φ) which is also affected by soakingthe soil. The test results show the Atterberg limits that a percentage of the original soil andaddition of clays to 20% has no plasticity index value. This is because the ground is still are off(loose soil). As for the addition of clays from the percentage of 30%, 40%, and 50% of the land isincluded soil cohesive and value each PI is 8.87%, 17.7%, and 12.04%.Keywords: direct shear, cohesion, plasticity index
ANALISIS PENGARUH PENAMBAHAN ZAT ADDITIVE ISS 2500 TERHADAP KUAT TEKAN BATU BATA DENGAN DAN TANPA PROSES PEMBAKARAN Febriantama, Aria; Afriani, Lusmeilia; Setyanto, Setyanto
Jurnal Rekayasa Sipil dan Desain Vol 4, No 1 (2016): Edisi Maret 2016
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Brick is a material t h a t made of clay. Bricks were made with or without additional mixturel throughsome processes and stages. I n t his study used the clay with additional mixture 2500 ISS ( Ionic SoilStabilizer ) which has variety levels mixture of 0,9 ml, 1,2 ml , 1,5 ml and 2,1 ml with the intention to improvethe quality of brick. It is necessary to do the research , so this study can be compared with SNI standards.The tested samples in this study are clay that comes from jl . Nunyai , Rajabasa . It sample was curing for 7day and then, the samples will be done with or without burning process.Based on the results of physical testing the samples, USCS classify soil samples as clay with low plasticityand belongs to the ML group . After doing research of compressive strength testing of with and withoutburning process from four levels generating the compressive strength maximum average at a level of 2.1 mlboth of them. With value 21,24 kg / cm 2 for burning process and 4.25 kg / cm 2 for without burning process.Which is both of those treatments are not included into 25 classes based on tables strength of compressedbricks ( SNI 1991 ).Keywords: brick, clay, iss 2500 (ionic soil stabilizer), compressive strength.
Pengaruh Subtitusi Pasir Pada Tanah Organik Terhadap Kuat Tekan dan Kuat Geser Putra, Rizki Dwi; Iswan, Iswan; Afriani, Lusmeilia
Jurnal Rekayasa Sipil dan Desain Vol 4, No 2 (2016): Edisi Juni 2016
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Physical properties of organic soils have a very high water content and low carrying capacity.One method to increase the carrying capacity of the soil is by adding or mixing with materials thathave a high carrying capacity. By adding sand on the sample in this study is expected to increasethe carrying capacity of organic soils of compressive strength and strong shear. The study wasconducted in the laboratory of Soil Mechanics Faculty of Engineering, University of Lampung, bymaking a sample of the results of compaction standard, then the samples are given the addition ofsand to the percentage increments of 5%, 10%, 15%, and 20% for the comparison of thecompressive strength (qu), shear angle (φ), and the value of cohesion (c) after the addition ofsand.Results of testing the compressive strength and shear strength showed soil behavior in a state ofthe sample with the addition of sand up to 20% has an increased qu and φ, but a decline in thevalue of soil cohesion. The more increasing mix of sand in the soil samples, the values ofcohesion / coherence on the ground will be more decreased, but the sand has good gradation andstrong grain will be able to withstand the load that works vertically or horizontally.Keywords: Organic Soil, Compressive strength and Shear strength, Friction Angle, and Cohesion.