KEKUATAN LEKAT BETON DAN BAJA TULANGAN AKIBAT PEMANASAN

Ellen Kumaat




Abstract


The combination of concrete and steel form economical and efficient composite material by means of
the created cooperation through bond stress on the interface of both materials. Heating at varying
temperature would result in behaviour change of the composite material, particularly regarding its
bond stress performance due to the microstructure change of the concrete and steel.
The uniaxial compression test indicated that the value of concrete compression strength on seven days
if heated at 2000 C , 5000 C, and 8000 C temperature would decrease, varying from six to 100%,
whereas the decrease of concrete compression strength on 28 days varying from ten to 90%. At 2000 C
heating, the decrease of bond stress between steel and concrete on 28 days was approximately 30%.
Heating at a higher temperature or at 5000 C would lead to 40% to 77% decrease. The decrease of
concrete compression and that of bond stress due to heating was presented by a non-linear curve
showing that there was a positive correlation between the two characteristics.


Abstract in Bahasa Indonesia :


Perpaduan antara material beton dan baja tulangan akan membentuk material komposit yang
ekonomis serta efisien lewat hasil kerjasama yang tercipta melalui kekuatan lekat pada interface
kedua material tersebut. Pemanasan dengan temperatur yang bervariasi akan menyebabkan
terjadinya perubahan perilaku material komposit tersebut, khususnya menyangkut kinerja
kekuatan lekatnya akibat perubahan mikrostruktur pada material beton dan material baja
tulangan.
Dari hasil uji tekan uniaksial diperoleh nilai kuat tekan beton umur tujuh hari yang bila
dipanaskan dengan temperatur 200oC, 500oC dan 800oC akan mengalami penurunan yang
bervariasi antara enam hingga 100%, sedangkan penurunan kuat tekan beton pada umur 28 hari
berkisar antara sepuluh hingga 90%. Pada tingkat pemanasan dengan temperatur 200oC,
penurunan kekuatan lekat antara baja tulangan dan beton umur 28 hari adalah sekitar 30%, serta
untuk pemanasan dengan temperatur yang lebih besar atau sama dengan 500oC akan terjadi
penurunan sebesar 40% hingga 77%. Penurunan kuat tekan beton dan penurunan kekuatan lekat
beton dengan baja tulangan akibat pemanasan dipresentasikan oleh kurva tidak linier serta
menunjukkan adanya korelasi positif antara kedua karakteristik tersebu


Keywords


bond stress, steel, concrete, heating, temperature.

Full Text: PDF

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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