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Agus Setyo Muntohar
Department of Civil and Environmental Engineering, Faculty of Engineering, University of Malaya Kuala Lumpur Malaysia
Civil Engineering, Building, Construction & Architecture

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UTILIZATION OF UNCONTROLLED BURNT RICE HUSK ASH IN SOIL IMPROVEMENT Agus Setyo Muntohar
Civil Engineering Dimension Vol. 4 No. 2 (2002): SEPTEMBER 2002
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (163.891 KB) | DOI: 10.9744/ced.4.2.pp. 100-105

Abstract

Expansive soil has been a problem in Indonesia as in other countries. Current research found that there is a potential use of silica waste%2C resulting from burnt rice husk%2C as a pozzolanic material. This paper presents the results of study on the utilisation of ashes produced from uncontrolled rice husk burnt in Yogyakarta %28Indonesia%29.%0D%0A%0D%0AIn this research%2C a series of laboratory tests has been conducted. The tests were carried out individually or in a combination in which the Rice Husk Ash %28RHA%29 content were varied from 7.5%2C 10%2C and 12.5 percent%2C and the lime content from 2%2C 4%2C 6%2C and 10 percent %28by the dry weight of soil%29. All the samples have been remoulded at their optimum moisture content %28OMC%29 and maximum dry density %28MDD%29. The research shows that lime - rice husk ash decreased the swell of expansive soil and improved its strength and bearing capacity.%0D%0A Abstract in Bahasa Indonesia : soil+improvement%2C+expansive+soil%2C+uncontrolled+-+burnt%2C+rice+husk+ash.
SWELLING AND COMPRESSIBILITY CHARACTERISTICS OF SOIL - BENTONITE MIXTURES Agus Setyo Muntohar
Civil Engineering Dimension Vol. 5 No. 2 (2003): SEPTEMBER 2003
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (116.039 KB) | DOI: 10.9744/ced.5.2.pp. 93-98

Abstract

Understanding characteristics of soil mixtures lead to increasing the confidence level before applying such materials in the field. The outcomes of this study can provide insight into the swelling and the compressibility behavior of soil – bentonite mixtures, between non-swelling materials and swelling materials. A simple swell and compression laboratory test has been conducted for the purposes of this study. The result of this study indicated that the existence of bentonite in the soil mixtures influence the swelling behavior, which follows a hyperbolic curve model. Amount and size of nonswelling fraction affected the swelling and compressibility.
THE INFLUENCE OF MOLDING WATER CONTENT AND LIME CONTENT ON THE STRENGTH OF STABILIZED SOIL WITH LIME AND RICE HUSK ASH Agus Setyo Muntohar
Civil Engineering Dimension Vol. 7 No. 1 (2005): MARCH 2005
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (198.661 KB) | DOI: 10.9744/ced.7.1.pp. 1-5

Abstract

The strength gain of stabilized soils is not only influenced by the type and proportion of the stabilizers and its curing time, but also by the water content needed to maintain the reaction. The reaction of lime – RHA with soil is pozzolanic. Hence, the process will be subjected greatly by the amount of water to react with admixtures and the proportion of the stabilizer. This paper presents the result of a laboratory study on the unconfined compressive strength (UCS) of soils stabilized with lime and RHA, compacted at the OMC, and at the dry and wet side of OMC. The amount of lime required for stabilization (LRS) is determined by Eades and Grim's Method. The results showed that the water content determines the UCS characteristics of unstabilized and stabilized soils. The UCS of stabilized soils decreased with increasing molding water content, but it is still higher than of the un-stabilized soils. In general, higher lime content results to a higher UCS. The maximum strength of the stabilized soil is attained at lime/RHA ratio of 1/2. The UCS of the stabilized soil increased significantly about 7 – 9 times to the un-stabilized UCS.
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