Performance of Bituminous Mixes with Different Aggregate Gradations and Binders

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Author(s) Haider Habeeb Aodah | Yassir N. A.Kareem | Satish Chandra
Pages 1802-1812
Volume 2
Issue 11
Date November, 2012
Keywords Performance, Aggregate gradation, Tensile strength, Shear strength, Rutting behavior.

Abstract

A bituminous mixture is composed of approximately 95% by weight, or 80% by volume, mineral aggregate. Therefore it is important to see how aggregate gradation affects the performance of bituminous mixes. The present study was taken up with the objectives of evaluating the effect of aggregate gradation on indirect tensile strength, shear strength and rutting behaviour of bituminous mixes and thereby to establish the relationship between some aggregate gradation parameters and tensile strength, shear strength, horizontal tensile strain and rutting values. Three aggregate gradations, two types of binder; VG-30 and PMB-40 and two types of mixes, Bituminous Concrete (BC) and Dense Bituminous Macadam (DBM) are used. The results indicate that the performance of mixes made with PMB-40 is better than that of the mixes made with VG-30 for both BC and DBM. In general, the BC mix is better than DBM mix in term of indirect tensile strength (ITS), horizontal tensile strain (HTS), and the compressive strength, while DBM mix is better in terms of shear strength and rut resistance. A parameter called gradation ratio is defined in this paper and is correlated with strength and performance parameters of a mix to predict later from aggregate gradation curve alone.

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