THE SUITABILITY OF A 60 PEN. BLEND OF REFINERY AND MICRO ASBUTON BITUMEN IN HOT ROLLED SHEE

• Main Author: Sebayang, Ayat
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/2763
• Institution: Institut Teknologi Bandung

THE SUITABILITY OF A 60 PEN BLEND OF REFINERY AND MICRO ASBUTON BITUMEN IN HOT ROLLED SHEET, Ayat Sebayang, 1991, Program Sistim dan Teknik Jalan Raya, Program Pascasarjana, Institut Teknologi Bandung. Investigations of the suitability of Indonesia Rock Asphalt (Asbuton) for use in hot-mix bituminous material have generally involved the use of a fluxing agent to effect release and permanent softening of the Asbuton bitumen. Recent developments in methods of processing Asbuton have resulted in the production of a material that is dry and of reasonably constant bitumen content. Average particle size of this material, called Micro-Asbuton is 300 micron. The physical characteristics of Micro-Asbuton suggest the possibility that bitumen release can be effected by hot refinery bitumen alone. This thesis describes an investigation of factors affecting the release rate of Asbuton bitumen when heated refinery bitumen alone is used and an evaluation of Hot Rolled Sheet (HRS) mix containing Asbuton . Preliminary investigations showed that the blend of Asbuton bitumen and refinery bitumen required to produce a 60 pen grade binder contains 12.3 percent Asbuton bitumen by weight of total binder. Mortars of Asbuton and refinery bitumen were prepared by combining Asbuton at room temperature with refinery bitumen heated to different temperatures. Mixing times were varied from 10 sec to 3 minutes. Analysis of the mortars by means of the penetration and Ring and Ball Softening Point Temperature tests provided no clear indication of the combination of refinery bitumen temperature and mixing time that would be most effective in releasing Asbuton bitumen. This phase of the investigation was extended to include mortars prepared by mixing heated Asbuton with heated refinery bitumen and again no definite trend was apparent . <br /> HRS mix containing Asbuton was prepared by heating the Asbuton to 175°C and the refinery bitumen to 160°C . The choice of Asb,Yfon temperature was purely arbitrary. Marshall analysis , together with other laboratory performance indicators ,suggests that the characteristics of HRS containing Asbuton are similar to those of conventional HRS mix .However it is stressed that the amount of Asbuton added is comparatively small i.e. only in the amount necessary to produce a binder having 12.3 percent Asbuton bitumen . Readers of this thesis should be aware that concern has been expressed regarding the accuracy of the data. Consequently care should exercised in interpreting the findings