Fig. 3.
SEM micrographs of selected composites before and after weathering; (a) reference, (b) PB_C10, (c) PB_C4; (d) PB_C4_CB; asterisk denotes the composite surface after weathering.
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.