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What is the purpose of tar in bituminous materials?

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Tar is commonly incorporated in bituminous materials because of the following reasons:

(i) Blending of tar with bitumen possesses better binding performance with roadstone than bitumen.

(ii) Resistance to fuel oil erosion is high. Tar is used in roads where there is frequent spillage of fuel from vehicles.

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This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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