Page 464 - Handbook of Thermal Analysis of Construction Materials

Section 6.0 - Magnesia-Phosphate Cements 439

(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 H PO (ADP) and Na P O (STPP). The
4
10
5 3
4
2
water/solid ratio including silica sand was 1:8 or 1:16. The principal
hydrate formed was struvite, NH MgPO •6H O. Schertalite, (NH )
4 2
4
4
2