I Dewa Made Alit Karyawan when delivering his dissertation presentation at the doctoral promotion

ITS Campus, ITS News-the occurrence of rubber buildup or rubber deposit at runaway airport, can certainly cause safety threats for the passengers of the aircraft. Looking at the phenomenon, the doctoral student of Institut Teknologi Sepuluh Nopember (ITS) of the Department of Civil Engineering, I Dewa Made Alit Karyawan, researched for his dissertation presented in the open session of the doctoral promotion, Monday (24/2).

Housed in the courtroom of the Department of Civil Engineering, Dewa presented his research on the potential of artificial aggregate use of coal waste (fly ash) in concrete asphalt mixture to reduce the rubber deposit on the runway surface.

Dewa started his presentation by discussing the pollution caused by the high waste of steam power plant (PLTU) coal-based. The abundance of these fly ash can cause serious environmental problems and have even been designated as hazardous and Toxic substances (B3).

Therefore, in this study Dewa wanted to reduce pollution by utilizing the fly ash as the basic material of the aggregate manufacture that usually comes from sand, gravel, and so on that is used in concrete asphalt mixture.

The man who works as a lecturer of the Departement of Civil Engineering Mataram University explained, this research also aimed for the safety of riders or passengers of the aircraft. “The use of artificial aggregate in the mixing of concrete asphalt can reduce the rubber deposit or rubber buildup on the runaway that caused the texture of the runaway surface,” he said.

The doctoral promotion session that presents the I Dewa Made Alit Karyawan in the department of Civil Engineering ITS

An alumnus from Udayana University added the presence of the rubber deposit makes the track becomes slippery and causes the aircraft can not stop at the desired position. This man from Mataram explained that this artificial aggregate was made using a granulator tool with a slope of 50 degrees and applied variations of the alkali ratio of 1:2.5 between sodium hydroxide and sodium silicate. Then, this artificial aggregate will be tested using two measuring methods, namely Marshall and wheel track.

Dewa also explained the best composition of artificial aggregate in the mixing of concrete asphalt that he thoroughly. “The concrete asphalt mixture in this study has a 25 percent composition of artificial aggregate and 75 percent of natural aggregate,” he explained. In his presentation, he revealed that the composition of the mixture can produce pores large enough to accommodate the scours from the wheel of the plane.

Dewa acknowledged that artificial aggregates are more expensive than natural aggregates because the constituent materials are more expensive. Therefore, the man who had studied S2 at Universitas Brawijaya, Malang said if this research has not stopped here. “In the future, I want to continue this research, but also it still in the laboratory scale with conditions that are approaching the actual case,” he explained.

Dewa hopes his research can be continued on a bigger scale either by himself or others. In the doctor’s hearing, Dewa was tested by Prof. Dr. Ir Triwulan DEA from the Department of Civil Engineering ITS, Prof Dr. Ketut Buda Artana ST. MSc from the Department of Marine Engineering, as well as external judges from the Department of Civil Engineering Udayana University, Prof. Ir. I Nyoman Arya Thanaya ME Ph.D.

Dewa also expressed his gratitude for being able to pursue a doctoral program. He said that during the course of this program many gained much science especially from his mentor, Ir Ervina Ahyudanari ME Ph.D., Dr. Eng Januarti Jaya Ekaputri ST MT, and Iswandaru Widyatmoko ST MSc Ph.D. CEng FCIHT FIAT. “Taking the doctoral course is my dreams, I would like to further improve the three pillars of higher educations in the future,” said Dewa. (meg/rev/ITS Public Relations)

Potret bersama I Dewa Made Alit Karyawan bersama jajaran pembimbing dan penguji saat sidang doktor.its