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.
Schematic diagram that illustrates the nature of the linear aluminosilicate chains in C-S-H. The unfilled triangles represent Si—O tetrahedra and the shaded triangle represents an Al—O tetrahedron. Q2 = Q2P; Q2 is sometimes written as Q2(0Al) to indicate the lack of Al at one of the two adjacent tetrahedral sites. v = vacant tetrahedral site.
