Study on the Microscopic Mechanism and Performance of TPU/SBR Composite-Modified Asphalt.

As can be seen from Figure 8 , after adding a different dosage of SBR, the penetration value of asphalt showed a decreasing trend, and the change ranges were −2.3 mm, −2.9 mm, −3.4 mm, −4.5 mm, and −5.7 mm, respectively, while the softening point value of asphalt showed an increasing trend.

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However, with the increase in TPU added, the ductility value of asphalt showed a trend of increasing first and then decreasing, and the ductility change of asphalt was +38.05%, +16.81%, −6.19%, and −27.43%, respectively.

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