Figure 3.
Molecular model diagram of asphalt components. (Note: in the model, red is atom O, blue is atom N, and yellow is atom S).
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.