A blend is a material consisting of two or more different substances mixed together. In the reference article, a blend refers to a mixture formed by adding SBS (Styrene-butadiene rubber-styrene-butadiene copolymer) to a base bitumen.

There are several reasons why SBS can improve bitumen elastic modulus greatly. First of all, SBS has good elasticity and flexibility, which can increase the elastic modulus of the blend. Secondly, SBS has good compatibility with bitumen, and can form a uniform mixture with bitumen, thereby improving the elastic modulus of the blend. In addition, SBS can also increase the viscosity of the blend, making it have better deformation resistance at high temperatures, and further improve the elastic modulus.

In addition, SBS can also improve the heat resistance of the blend. In the high temperature stage, SBS can absorb the work done by external forces and escape in the form of heat, so that the bitumen is in a complete viscous state. This viscous state can effectively increase the elastic modulus of the blend.

In summary, the improvement of the elastic modulus of bitumen by SBS is due to its good elasticity and flexibility, compatibility with bitumen, and the improvement of viscosity and heat resistance of the blend.

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