PERUBAHAN PERILAKU LEMPUNG ORGANIK YANG DISTABILISASI DENGAN KAPUR DAN ABU TERBANG KELAS F (2022)

Hatmoko, John Tri and Jati, Dinar Gumilang PERUBAHAN PERILAKU LEMPUNG ORGANIK YANG DISTABILISASI DENGAN KAPUR DAN ABU TERBANG KELAS F (2022). [Research] (Unpublished)

Text (John Tri Hatmoko dan Dinar Gumilang Jati) Laporan Akhir John Trihatmoko-Dinar Gumilang.pdf Restricted to Repository staff only Download (1MB)

Abstract

Organic clay has, usually, more than 10% organic content. Its improvement technology is different from that of an-organic clay, therefore the research about organic clay improvement is not as intensive as the research about improvement of an-organic clay. This research investigated the change of unconfined compression strength (qu) of organic clay stabilized with lime and class F of fly ash. Soil samples were taken from four different site : Wates, Kalasan, Piyungan and Playen. Those three soil samples have different organic content (OC), and engineering characteristics. Three different Fly ashes (FA-X, FA-Y and FA-Z) were purchased from local supplier. The three fly ashes have different engineering characteristics, and lime was also bought from local material store. The dry oven soils were mixed with 5, 15, and 25% of fly ashes (FA-X, FA-Y and FA-Z) then optimum water content of soils were added to the blend. The blend were formed in unconfined compression test samples the cured on 7, 14, 21 and 28 days curing period. Finally, the unconfined compression tests were performed on all soil samples. The results indicate that the change of unconfined compression strength depend on organic content (OC) of soils and fly ashes, the degree of acidity (pH) of soils, the CaO conten and ratio of CaO/SiO2 in the fly ashes, fly ashes proportion and the curing period. The qu of stabilized soil decrease proportional to the increase of OC in the soil and fly ashes. With respect to pH, the optimum improvement of qu is on the value of pH around 4, and it decreases when pH is more than or less then 4. When CaO content on FA increase, the qu of the stabilized soil is also increase, and the best improvement of qu, was found on CaO/SiO2 around 0.30. The qu of the mixed improve significantly due to improvement of FA in the blend. The significant improvement can be noted on the content of FA 18 to 25%. Due to the increase curing time the qu of lime and flay ash stabilized soil increases. The sharp improvement occur on the curing period 21 to 81 days, because pozzolanic reaction start happening on that period. It can be compared to 7 to 15 days of curing, in this period only the cation exchanges reactions occur not cementation of the stabilized soil, therefore the improvement of qu is not as sharp as on the blend cured 21 to 28 days.

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