ISSN:
1433-075X
Keywords:
Key words Hydration and solidification
;
Ternary system of CaO-Al2O3-P2O5
;
New crystal phase L
;
New crystal phase H
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The patterns of hydrating and solidifying with the compositional variation of phosphorus-rich, phosphorus-calcium-rich and aluminum-calcium rich regions in ternary system CaO-Al2O3-P2O5 has been studied in detail, and two new ternary compounds L and H have been synthesized here. The results indicate that the region of 48–56% P2O5 doesn’t present cementitiousness, which contains mainly crystal phases of β-C2P(2CaO·P2O5), α-C3P(3CaO·P2O5) and AlPO4; the phosphorus-calcium-rich region of 21–35% P2O5 exhibits substantial cementitiousness, which contains mainly crystal phase of α-C3P and certain amount of CA(CaO·Al2O3) and new phases L/H; and the aluminum-calcium-rich region of 8–18% P2O5 is full of promise for cementitiousness. It contains mainly new crystal phase L and certain amount of α-C3P and CA. The hydration and solidification mechanisms have been preliminarily analyzed by means of XRD, XPS and DTA. It appears that crystal phase CA might hydrate directly to the stable phase of C3A·6H2O in the phosphorus-rich case of 21–35% P2O5; new phase H has the behavior of rapid setting; and L, being a dominant phase, can prevent cement pastes from significant strength loss in long curing cycles.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100190050071
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