PENYEBARAN KEKUATAN DARI KOLOM YANG TERBUAT DARI LIMBAH KARBIT DAN KAPUR

Gogot Setyo Budi




Abstract


A method commonly used to stabilize expansive soils is mixing the soil with foreign materials. The
main obstacle raised from soil stabilization in the field is the difficulty in mixing process. This paper
presents the strength distribution in soft soil due to the addition of single columns of quicklime and
carbide waste- product from gas industry that contains Calcium Oxide (CaO) up to 60%.
The results show that the addition of columns filled with carbide waste product and quicklime
increase the shear strength of surrounding soil. The spreading of the strength tends to follow a unique
pattern, that the increase of soil shear strength at a certain normalized-distance, S (in column
diameter D) from the column axis is constant. A significant increase of strength occurs in the area
closer to the column, and it decreases with the distance from the column.


Abstract in Bahasa Indonesia :


Metode yang umum dipakai untuk menstabilisasi tanah adalah mencampur tanah asli dengan
material lain. Kendala utama yang timbul pada stabilisasi tanah di lapangan adalah kesulitan pada
proses pencampuran. Makalah ini mempresentasikan penyebaran kekuatan tanah akibat kolom
tunggal yang terbuat masing-masing dari kapur aktif dan limbah karbit, yang mengandung unsur
Calsium Oksida (CaO) sampai 60%.
Hasil penelitian menunjukkan bahwa penambahan kolom limbah karbit dan kolom kapur dapat
meningkatkan kekuatan tanah di sekitarnya. Penyebaran kekuatan tanah di sekitar kolom kapur
dan limbah karbit cenderung mengikuti suatu pola yang unik, yaitu bahwa peningkatan kekuatan
tanah pada jarak (yang dinormalisasikan dengan diameter kolom D) adalah tetap. Peningkatan
kekuatan geser tanah yang signifikan terjadi di daerah dekat kolom dan peningkatan ini mengecil
seiring dengan jarak dari kolom.


Keywords


strength, soil stabilization, quicklime, Carbide waste product.

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Obituary: Professor Joseph Andy Soesilo
Founder of Jurnal Dimensi - predecessor of Civil Engineering Dimension journal

Djwantoro Hardjito & Benjamin Lumantarna | Civil Engineering Dimension 
May 25, 2015

ar Professor Joseph Andy Soesilo passed away on Friday, May 22, 2015 at the age of 71, in Tempe, Arizona, USA. Born in Blora, Central Java, Indonesia as Djwa Bian An, Andy came to Surabaya to pursue his tertiary education and received his bachelor’s degree in civil engineering from Petra Christian University in 1972. He was in the first batch of students in the civil engineering department in the university in 1962. He got his masters degree from the Asian Institute of Technology, Thailand, in 1976, and later on his Ph.D from the Department of Geography, Arizona State University, Tempe, USA in 1982.
During his studentship, Andy was actively involed in student movement. Among others, he pioneered the student magazine GENTA in 1964, especially to promote the university to wider community. GENTA is still exist right now, and considered as one of the oldest student magazines in Indonesia. Andy was the first president of the student council in the university, in the era which was characterized with political turmoil in the country.
He joined the Civil Engineering Department at Petra Christian University as lecturer in 1972, later becoming the Director of Student Affairs in the University from 1976-1977, and Director of Research and Community Outreach from 1977-1981.
While at Petra Christian University (PCU), he made major contributions to the establishment of Jurnal Dimensi in 1980, a journal to publish scientific articles, particularly resulted from research carried out by PCU lecturers and scholars. This journal is the predecessor of the current Civil Engineering Dimension Journal and several other journals published by PCU. The establishment of Jurnal Dimensi was visionary and exemplary, as at that time publication of scientific articles has yet to become obligation to Indonesian lecturers. Until his last day, Andy has served as a member of the International Advisory Board of CED journal.
In 1982, Andy moved to USA, to join the Arizona State University (ASU) as a Research Associate until 1988. For twenty years from 1988, Andy was affiliated with Arizona Department of Environmental Quality (ADEQ) as an environmental planner. Following his retirement from ADEQ, He was still lecturing as an adjunct professor at Urban Planning Department at ASU. Together with several friends, he founded Persekutuan Kasih Kristus Arizona (PKKA), Inc., a foundation to help Indonesian Christian schools in the rural areas.
Among his publications are ‘Site Remediation: Planning and Management’ (CRC Press, 1997) and ‘Hazardous Waste Planning’ (CRC Press, 1995). He supposed to present his paper entitled ‘The Role of Municipal WWTPs in Arizona’s Water Conservation’ in the coming ‘The Fifth Euro Asia Civil Engineering Forum’ (EACEF-5) conference, to be held at Petra Christian University, Surabaya, Indonesia, from 15-18 September 2015.
Andy, who had lived in Tempe, Arizona, USA, was the husband of Ursula (Lanny) Soesilo and the father of Irene and Stanley Soesilo.

 

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