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Effect of Aggregate Shape and Binder on the Rutting Characteristics of Bituminous Mixes

INTHA SRINIVASA REDDY

Abstract


Rutting or permanent deformation is the depression in the wheel paths due to accumulation of small amounts of unrecoverable strains under the channelized repeated wheel loads. Shear deformation or lateral plastic flow of the bituminous mix from the wheel tracks also results in rutting. Performance of bituminous mixes is influenced by the constituents of the mix made of aggregates and binder. Among various parameters of these two ingredients, aggregate shape and quality of binder are very important in having satisfied performance of bituminous mixes especially effecting rutting resistance of the mix. Current Marshall mix design specifies certain criteria to be satisfied for different mixes in terms of stability, volumetrics and parameters of the mix. However this criterion does not guarantee performance of the mix as issues such as pavement distresses are not fully addressed in the mix design. Hence it is essential to come out with mix design based on performance that address pavement distress in the form of flushing, bleeding, rutting, early age cracking, etc. Research studies have shown that shape of the aggregate and type of binders have greater influence on performance of the mixes especially on rutting characteristics of the bituminous mixes. In this paper, an attempt is being made to evaluate rutting resistance of mixes prepared with varied combined index (sum of flakiness and elongation index) values of aggregate and three types of binders using an indigenously developed simulative tester. From the results, it was observed that with the increase in combined index, rutting in bituminous mixes increases. Also variation of rutting in bituminous mixes with different types of binders at same combined index values of aggregates was observed.

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References


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DOI: https://doi.org/10.37628/jtets.v3i1.152

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