For experts, specialists, researchers, academic and students:

Why the rubberised mixes show higher cracking resistance by showing higher fracture energy as rubber content increases?. In other words, higher rubber contents mean higher viscosity, consistency, elasticity but less stiffness and lowest ductility ( mixes tend to be flexible more than rigid).

For info, in 1966, MacDonald and his team tried to manufacture a high viscous mixture in the lab and put it on cracked pavement, they saw that the cracking propagation has stopped and couldn't reach the top of layer [ expert].

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