Civil Engineering Reference
In-Depth Information
(a)
(b)
Figure 28.
(
a
) DTA curves of magnesia-phosphate cement systems.
[26]
(
b
) DTA curves of
phosphate cement mortars hydrated for
A,
5 minutes and
B,
672 hours.
In another study by Abdelrazig and co-workers,
[27]
thermal analy-
sis of mortars made from magnesia-phosphate cement was reported. The
magnesia was mixed with NH
4
H
2
PO
4
(ADP) and Na
5
P
3
O
10
(STPP). The
water/solid ratio including silica sand was 1:8 or 1:16. The principal
hydrate formed was struvite, NH
4
MgPO
4
•6H
2
O. Schertalite, (NH
4
)
2
