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Perilaku Geser Tanah yang Distabilisasi dengan Abu Ampas Tebu-Semen dan Inklusi Serat Polyester Hatmoko, John Tri; Suryadharma, Hendra
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (548.091 KB) | DOI: 10.14710/mkts.v23i2.15975


Bagasse ash is a fine residue collected from the burning of bagasse in sugar factory, and it behaves as pozzolanic materials. In addition, engineering behaviour of bagasse ash can be improved by addition of cement containing high calcium. Recently, research about cement stabilized soil is continuously in progress. In this paper, a set of experiment programs were done to investigate the randomly oriented polyester fibre  inclusion in bagasse ash-cement stabilized soil.  Bagasse ash was mixed with clay in different proportions. To get the optimum curing period,  it was done light compaction test of soil with 8% cement cured with 7, 14, 21, 28 and 36 days curing period,  that was found on 28 days. The next experiment was compaction test on soil + 8% cement + 3,6,9 and 12% bagasse ash to obtain optimum bagasse ash proportion. The result indicated that optimum bagasse ash content was 9%. To ensure this result, unconfined compression test was done on the same sample. Finally, light compaction, unconfined compression and direct shear tests were done on : soil + 8% cement + 9% bagasse ash +  polyester fibre with 28 days curing period. The results showed that maximum dry density and optimum moisture content was not influenced by fibre inclusion, whereas the increase of shear strength of stabilized soil with fibre inclusion  was mainly due to improvement of internal friction angle. In unconfined compression test, the unconfined compression strength of stabilized soil was significantly improved by fibre inclusion.
Jurnal Tekno Vol 17 No 1 (2020): Jurnal Tekno
Publisher : Direktorat Riset dan Pengabdian pada Masyarakat Universitas Bina Darma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33557/jtekno.v17i1.853


At the research area, there was found the high content lime -clay, that is usually low plasticity clay. The purpose of this research, then, to improve engineering properties of high content lime-clay by addition of rice husk ash (RHA). To enhance the purpose, a series of experimental programs was undertaken. Firstly, the standard compaction test was done on the soil + lime with and without curing time. Secondly, to get optimum lime content, there was performed CBR and unconfined compression tests on the soil +lime, and it was found that optimum lime content is 4%. Then, the CBR and unconfined compression experiment were done on the soil + 4% lime + ( 5, 10, 15,20, 25%) of RHA with 7,21,28, 36  56 days curing time. The results indicate that there was no significant changes of optimum moisture content (OMC) and maximum dry density (MDD) due to addition of lime to the soil. The initial unconfined compression stress of soil sample was 41.5 kPa that is classified as soft clay. Due to addition of lime, there was significant improvement of CBR and unconfined compression stress on 4% of lime with 36 days curing period. The CBR value and unconfined compression stress on the soil + lime + RHA increase proportional to the proportion of RHA. With respect to curing time, there was the improvement of the CBR and unconfined compression stress of stabilized soil, and the significant improvement was found on 56 days curing time. However, there was no optimum curing time found in this research..