try are concerned, this
is a major drawback.
This explains why geopolymer applications
were first developed in
other fields and niche
markets, which do not
require these types of
codification.
Geopolymer Moulds
T.D. Volume change is the most detrimental property of cement, causing
shrinkage which affects long-term strength and durability. Any suggestions
specific to geopolymers, about how to overcome this problem?
Dr. Davidovits
To understand the
long-term
durability
issues on geopolymers
we may make a parallel with glass technologies and science. It has
been recognized for a
long time that there is
at least a rough correlation between the dura-
bility of glasses and the
number of non-bridging
oxygens (-Si-OH or -SiO− Me+ groups). The
results of this study
reveal several points
that may be transferred
to geopolymer structures. One is that the
addition of aluminum
53
to a silicate framework
generally
increases
durability. The importance of non-bridging
oxygens on glass durability is that non-bridging oxygens provide
a point of attack on
a molecular scale for
protons or water mole-