Premium
Effect of Heat‐Treatment on the Constitution and Mechanical Properties of Some Hydrated Aluminous Cements
Author(s) -
SCHNEIDER SAMUEL J.
Publication year - 1959
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1959.tb12945.x
Subject(s) - anhydrous , differential thermal analysis , materials science , dehydration , hydrate , mineralogy , chemistry , diffraction , organic chemistry , optics , biochemistry , physics
The compound compositions of four aluminous cements were determined on anhydrous as well as hydrated specimens which had been heat‐treated at temperatures between room temperature and 1400° C. Phases were identified by X‐ray diffraction and differential thermal analysis. Specimens were also tested for transverse strength, dynamic modulus of elasticity, and thermal length change. A study of the dehydration characteristics of CaO ‐ Al 2 O 8 ‐ 10H 2 O 3 3CaO.Al 2 O 3 . 6H 2 O, and Al 2 O 3 . 3H 2 O was included. The data indicated that CaO. Al 2 O 3 10H 2 O was the primary crystalline hydrate formed in the cements at room temperature. At 50° C., 3 CaO Al 2 O 3 ‐6H 2 O and Al 2 O 3 . 3H 2 O were formed as by‐products of the dehydration of CaO.Al 2 O 3 .10H 2 O. When heated alone in an open system, CaO.Al 2 O 3 .10H 2 O did not convert to 3CaO. Al 2 O 3 . 6H 2 O and A1 2 O 3 . 3H 2 O. A correlation between the mechanical properties and compound compositions was noted.