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ITS » Master Theses » Geoteknik S2
Posted by aprill@is.its.ac.id at 28/08/2015 21:55:27  •  644 Views


PENGGUNAAN CAMPURAN KAPUR CAOH2 DAN FLY ASH SEBAGAI BAHAN STABILISASI

THE USE OF LIME CaOH2 AND FLY ASH AS ADMIXTURE FOR FIBROUS PEAT SOIL STABILIZATION

Author :
FEBRIANI, MARINES ( 3112201001 )




ABSTRAK

Tanah gambut merupakan tanah organik yang memiliki karakteristik tidak menguntungkan yaitu daya dukung yang rendah dan kemampumampatan yang besar. Karena karakteristik tersebut maka telah banyak dikembangkan metode untuk meningkatkan daya dukung dan mengurangi kemampumampatannya salah satunya adalah metode stabilisasi. Metode stabilisasi dilakukan dengan cara mencampurkan bahan additive seperti semen kapur fly ashdan abu sekam padi kedalam tanah. Penggunaan semen cukup memuaskan tetapi harga semen cukup mahal. Sedangkan penggunaan kapur sebagai stabilizer pada tanah gambut berserat tidak menunjukkan hasil yang memuaskan seperti pada tanah lempung. Oleh sebab itu telah dilakukan penelitian sebelumnya dengan menggunakan campuran kapur CaCO3 dan fly ash hasil yang didapatkan sebesar 10 admixture 30 kapur CaCO3 70 fly as. Pada tahun yang sama juga telah dilakukan penelitian menggunakan campuran kapur CaCO3 dan abu sekam padi hasil yang didapatkan sebesar 10 admixture 30 kapur CaCO3 70 abu sekam padi. Mengingat penelitian yang telah dilakukan hanya menggunakan kapur CaCO3 sebagai bahan stabilisasi maka perlu dilakukan penelitian menggunakan kapur jenis lain yang mudah ditemukan di pasaran yaitu kapur CaOH2. Atas dasar pemikiran tersebut maka dilakukan penelitian untuk memperoleh campuran bahan stabilizer yang paling optimum. Untuk itu dicoba 4 variasi perbandingan campuran antara kapur CaOH2 dan fly ash yaitu 595 1090 1585 2080. Setelah prosentase campuran bahan stabilizer dipilih tahap selanjutnya adalah menentukan prosentase stabilizer yang dapat memberikan peningkatan yang paling optimum terhadap perilaku gambut yang distabilisasi. Untuk itu dicampurkan stabilizer sebanyak 5 10 15 dan 20 terhadap berat kering tanah gambut dan kemudian masingmasing campuran diperam selama 10 20 30 dan 60 hari. Semua campuran yang telah diperam tersebut kemudian dites sifat fisik dan sifat teknisnya untuk dipelajari prosentase campuran yang memberikan perbaikan perilaku tanah gambut yang paling optimum. Selain itu dilakukan juga foto SEM Scanning Electron Microcope untuk mengetahui struktur mikro gambut yang distabilisasi. Hasil penelitian menunjukkan bahwa prosentase campuran bahan stabilizer yang memberikan hasil paling optimum adalah 10 CaOH2 90 fly ash. Stabilizer sebanyak 15 terhadap berat kering tanah gambut mampu memberikan peningkatan paling optimum terhadap perilaku tanah gambut yang distabilisasi. Harga specific gravity Gs dan berat volume t masing-masing meningkat dari 1.472 menjadi 2.192 dan dari 1.042 grcm3 menjadi 1.201 grcm3 kadar air wc dan kadar organik Oc masing-masing turun dari 646.993 menjadi 213.213 dan dari 98.750 menjadi 48.11. Disamping itu kuat geser tanah gambut yang distabilisasi meningkat dari 18.85 kPa menjadi 19.67 kPa dan total pemampatan turun dari 27.550 menjadi 18.025 terhadap tinggi inisial sampel.


ABSTRACT

Peat soil is an organic soil with unfavorable characteristics a low bearing capacity and high compressibility. Because of these characteristics it has developed methods to increase its bearing capacity and reduce its compressibility one of these developed methods is soil stabilization. Stabilization method is performed by mixing the additive materials such as cement lime fly ash and rice husk ash into soil. Usage cement gives satisfactory result but the price is quite expensive. If lime is used as an admixture it gives satisfactory results for clay soil but not for peat soil. Because of that research has been carried out in order to use lime CaCO3 and fly ash as an admixture the results showed that 10 admixture 30 lime CaCO3 70 fly ash gave very satisfactory result. At the same year research has also been carried out using lime CaCO3 and rice husk ash the results obtained was 10 admixture 30 lime CaCO3 70 rice husk ash gave the optimum result. Due to all of the researchs using lime CaCO3 as a stabilizing agent it is necessary to use another type of lime that is available in the market that is lime CaOH2. Based on these ideas this research was carried out in order to obtain the percentage of additive materials lime and fly ash. For that purpose four variations of lime and fly ash were chosen 595 1090 1585 2080. Afterwards the percentage of additive materials was determined as an admixture. The next step was to determine the percentage of admixture had to be mixed in peat soil that could provide the optimum improvement of peat soil behavior. In this study admixture as much as 5 10 15 and 20 of the dry weight of peat soil were chosen to be mixed in peat soil each of them was then cured at different period of times 10 20 30 and 60 days. All of them were then tested to determine its physical and engineering properties. From all of those results it can be determined the admixture percentage that able to improve the optimum behaviour of peat soil. SEM Scanning Electron Microscope was performed in order to see the microstructure of the stabilized peat. The results of this study show that the percentage of additive materials which gives the most optimum result is 10 CaOH2 90 fly ash. The admixture material 10 CaOH2 90 fly ash as much as 15 of the dry weight of peat soil is able to provide the most optimum improvement behavior of the stabilized peat soil. Specific gravity Gs and unit weight t increased from 1.472 to 2.192 and 1.042 grcm3 to 1.201 grcm3 subsequently water content wc and organic content Oc decrease from 646.993 to 213.213 and 98.750 to 48.11 respectively. In addition shear strength of the stabilized peat soil increases from 18.85 to 19.67 and total compression.



Keywordsfly ash; kapur (Ca(OH)2); stabilisasi kimia; tanah gambut berserat
 
Subject:  Enam sigma (Kualitas standar kontrol)
Contributor
  1. Prof. Ir. Noor Endah Mochtar, M.Sc., Ph.D.
Date Create: 28/08/2015
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-Master-31103150001402
Collection ID: 31103150001402
Call Number: RTS 624.151 363 Feb p


Source
Master Theses of Civil Engineering, RTS 624.151 363 Feb p, 2015

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Copyright @2015 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library




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  1.  ITS-Master-38642-3112201001-abstract_id.pdf - 404 KB
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  3.  ITS-Master-38642-3112201001-conclusion.pdf - 423 KB




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