EFFECT OF PARTICLE SHAPE ON THE WORKABILITY AND PROPERTIES OF CONVENTIONAL BITUMINOUS MIXES

Shivakumara S N, K M Mallesh, Mohammed Ilyas Anjum

Abstract: The flakiness and elongation index is an important physical property of mineral aggregates affecting the quality of asphalt mixes. The presence of Combined Flakiness and Elongation index (CFEI) exceeding certain limits adversely affects the durability and properties of asphalt mixture. A bituminous mixture is composed of approximately 95% by weight or 80% by volume of mineral aggregates. Therefore it is important to see how aggregate gradation and different combined indices affect the performance of bituminous mixes. In recent times continuous increase in volume of traffic has resulted in increased in demands for further research relating to the properties of the material such as workability and stability of hot mix asphalt. Workability of hot mix asphalt is a critical element in getting the desired density of asphalt pavements The present study was taken up with the observations of evaluating the influence of different combined shape indices on workability of bituminous mixes at upper, middle and lower gradation as per the MORTH specified For BC-II. In this study Marshall Method of mix design is adopted and OBC is determined only 30-35% combined indices of mid gradation. Same OBC is used for entire research work for evaluating the workability of bituminous mix at upper, middle and lower gradation of 30-35% 35-40%, 40-45% and 45-50% of combined indices

Keywords: combined indices, workability, aggregate gradation, hot mix asphalt

DOI: https://doi.org/10.15623/ijret.2015.0416010