That is nearly impossible to know, but my guess would be cement because cement is not only used for sidewalks, medians and some roadways, but it also used in heavy amounts as building material all over the world. Then again if we ponder the fact that most roads are made from asphalt, then consider how many roads there are and how far some roads stretch (some across entire countries), you could make a strong argument that there is more asphalt. Like I said that is near impossible to find out.
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