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ITS » Master Theses » Geoteknik S2
Posted by tondoindra@gmail.com at 30/12/2013 09:56:03  •  1245 Views


PENGGUNAAN CAMPURAN ABU SEKAM DAN KAPUR SEBAGAI BAHAN STABILISASI ADMIXTURE PADA TANAH GAMBUT YANG MENGALAMI PENGERINGAN

THE USE OF RICE HUSK ASH RHA AND LIME .AS A SOIL STABILIZATION ADMIXTURE OF FIBROUS PEAT WHILE SUBJECTED TO DRYING

Author :
WARDANI, MILA KUSUMA  ( 3110201003 )




ABSTRAK

Tanah gambut merupakan tanah yang berasal dari akumulasi bahan organik dengan kemampuan menyimpan air yang tinggi sehingga memiliki kemampumampatan yang tinggi dan kemampuan untuk mendukung beban yang rendah. Salah satu cara untuk memperbaikinya adalah metode stabilisasi dengan menggunakan kapur atau semen. Kapur lebih banyak dipilih karena harganya murah hanya saja hasilnya tidak memuaskan karena gambut tidak mengandung silika. Sejak 2009 telah dikembangkan bahan stabilisasi admixture yang mengandung silica dengan komposisi 70 abu sekam padi dan 30 kapur CaCO3 hasil yang memuaskan dicapai pada prosentase admixture sebesar 10. Hanya saja studi tersebut belum memasukkan faktor perubahan kondisi tanah yang sering terjadi di lapangan seperti pengeringan lahan. Oleh karena itu perlu dilakukan studi untuk mendapatkan prosentase admixture yang dapat memberikan hasil yang optimum terhadap peningkatan perilaku tanah gambut yang mengalami pengeringan penurunan kadar air. Dalam rangka menjawab permasalahan tersebut maka tanah gambut berserat yang distudi dibuat dengan kadar air awal bervariasi yaitu 80 60 dan 40 dari kondisi kadar air inisial WcI dimana WcI649.78. Masing-masing sampel yang disiapkan dicampur dengan admixture dengan kadar yang berbeda yaitu 5 10 dan 15 terhadap berat basahnya kemudian setiap campuran diperam selama 10 20 dan 30 hari. Sifat fisik dan teknis tanah ditentukan dari hasil uji laboratorium uji SEM juga dilakukan untuk melihat kondisi fisik mikro dari tanah. Hasil studi menunjukkan bahwa penurunan kadar air tanah gambut menyebabkan proses pembentukan CaSiO3 gel agak terganggu karena tidak tersedia cukup air didalam pori. Oleh sebab itu prosentase admixture juga harus dikurangi agar dapat memberikan perbaikan perilaku yang optimum pada tanah gambut berserat yang distabilisasi sampel dengan kadar air 80WcI dan 60WcI masing-masing dapat memakai admixture sebesar 10 dan 5 dan perlu diperam minimum selama 30 hari. Apabila tanah gambut berserat telah mengalami penurunan kadar air lebih dari 50 WcI penggunaan metode stabilisasi tidak direkomendasikan.


ABSTRACT

Peat soil originally comes from the accumulation of organic matter which has high ability to store water therefore it is very compressible and has low bearing capacity. One of the available methods to improve its behavior is soil stabilization using lime or cement. Lime is more popular to be used due to it is very inexpensive however it gives very unsatisfactory result because peat does not have silica content. Since 2009 it has been developed stabilization admixture with silica content as a mixture of 70 rice husk ash RHA and 30 CaCO3 lime. The used of 10 admixture give satisfactory results in improving the peat soil behavior. Nevertheless the 10 admixture cannot be applied to all peat in the field because some of the peat land has been subjected to drying before it is constructed. Based on that reason more study is needed in order to known whether 10 admixture is still able to provide optimum improvement of the properties of fibrous peat while subjected to drying. In order to answer those problems it was prepared fibrous peat samples with different water content those were 80 60 and 40 of the water content initial WcI in which WcI649.78. Each of the prepared sample was then mixed with varied stabilization admixture 5 10 and 15 of the peat wet weight. Afterwards all of the prepared samples were cured in different time periods 10 20 and 30 days. The physical and engineering properties were then determined from the laboratory test results SEM test was also carried out in order to see micro structure of the peat. The study results show that reduction of water content of the peat is able to disturbed the process of CaSiO3 gel formation due to there is no enough water available in the soil pores. Because of that the used of stabilization admixture also has to be reduced in order to get the optimum improvement of the stabilized fibrous peat. Fibrous peat with water content of 80WcI and 60WcI are able to use 10 and 5 of stabilization admixture respectively and cured at least in 30 days. The stabilization method however is not recommended when the fibrous peat subjected to 50 or more water content reduction.



Keywordsabu sekam padi;kapur CaCo3;pengeringan;stabilisasi;tanah gambut berserat
 
Subject:  none
Contributor
  1. Prof. Ir. Noor Endah Mochtar M.Sc.,PhD.
Date Create: 02/08/2012
Type: Text
Format: PDF
Language: Indonesian
Identifier: ITS-Master-31003130000309
Collection ID: 31003130000309
Call Number: RTS6 31.826 War p


Source
Master Theses of Civil Engineering RTS6 31.826 War p, 2013

Coverage
ITS Community

Rights
Copyright @2012 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-28657-3110201003-Abstract_id.pdf - 183 KB
  2.  ITS-Master-28657-3110201003-Conclusion.pdf - 194 KB




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