DEVELOPMENT OF A CYCLIC WATER VAPOUR TEST FOR DURABILITY ASSESSMENT OF BITUMINOUS MIXTURES

• Main Author: Hario Setiadji (NIM 26997031), Bagus
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/7373
• Institution: Institut Teknologi Bandung

ABSTRACT: <br /> <br /> <br /> The term durability refers to the resistance of a bituminous mixture to disintegration under traffic loads and weathering. Weathering includes the influence of water, in any form, which together with temperature and time reduces the durability. To date, studies of durability assessment have generally been performed to gain information on the resistance of mixtures to the influence of water, especially in fluid form. In this study, a different method of durability assessment was developed, i.e. to investigate the influence of water vapour on the durability. <br /> <br /> <br /> The new method involved subjecting samples of bituminous mixtures to 10, 20, 30 and 60 cycles of <br /> <br /> <br /> evaporation-condensation at 60 derajat C. Each cycle consisted of 12 hours during which evaporation took place followed by 12 hours during which the vapour was allowed to condense. The number of cycles matches the number of periods in the modified Marshall immersion test, which is another test used in this study for comparison, although the lengths of the tests are not similar, i.e. in the modified Marshall immersion test <br /> <br /> <br /> samples were immersed for 1, 4, 7 and 14 days at 60 derajat C. The development of the method also included the development of the apparatus. Evaluation of the new method was based on the Marshall Index of Retained Stability and the durability index. The study focused on two types of bituminous mixture, i.e. Hot Rolled Asphalt type F with Portland Cement as filler, and Asphaltic Concrete with sand stone filler. <br /> <br /> <br /> The results show that the index of retained stability after the water vapour test follows a pattern of durability which is similar to that of the immersion. However, the difference in index of retained strength between maximum and minimum values is more significant for the water vapour test than that for the immersion test. This is an indication that the procedure is sufficiently severe and the apparatus of the cyclic water vapour test can be used for durability tests on bituminous mixtures.