A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
27Al Magic Angle Spinning–Nuclear Magnetic Resonance (MAS-NMR) Analyses Applied to Historical Mortars
In addition to a calcium-containing substance, medieval mortars usually contain alumina-silicates in various forms, such as the remnants of weathered rocks, clays, and crushed ceramics. As researchers have long ignored the role of alumina-silicates in historical mortars, this study focused on the aluminum coordination in mortars performed by 27Al magic angle spinning–nuclear magnetic resonance (MAS-NMR) in the solid state. The identification of aluminum coordination with oxygen helps to explain the thermal treatment of clayed substances in calcareous rock the common knowledge of the addition of ceramic shards to calcareous matrices. The specific behavior of the thermal transformation of aluminum ions at temperatures <1000° C results in its hydration in alkali aqueous conditions during the lime slaking process. Alumina and silica in common 4-fold coordinated positions form polycondensed chains where negative charge of 4-fold coordinated aluminum ion is balanced by calcium.
27Al Magic Angle Spinning–Nuclear Magnetic Resonance (MAS-NMR) Analyses Applied to Historical Mortars
In addition to a calcium-containing substance, medieval mortars usually contain alumina-silicates in various forms, such as the remnants of weathered rocks, clays, and crushed ceramics. As researchers have long ignored the role of alumina-silicates in historical mortars, this study focused on the aluminum coordination in mortars performed by 27Al magic angle spinning–nuclear magnetic resonance (MAS-NMR) in the solid state. The identification of aluminum coordination with oxygen helps to explain the thermal treatment of clayed substances in calcareous rock the common knowledge of the addition of ceramic shards to calcareous matrices. The specific behavior of the thermal transformation of aluminum ions at temperatures <1000° C results in its hydration in alkali aqueous conditions during the lime slaking process. Alumina and silica in common 4-fold coordinated positions form polycondensed chains where negative charge of 4-fold coordinated aluminum ion is balanced by calcium.
27Al Magic Angle Spinning–Nuclear Magnetic Resonance (MAS-NMR) Analyses Applied to Historical Mortars
Hanzlicek, Tomas (author) / Perna, Ivana (author) / Brus, Jiri (author)
International Journal of Architectural Heritage ; 7 ; 153-164
2013-01-01
12 pages
Article (Journal)
Electronic Resource
Unknown
| British Library Online Contents | 1993
| British Library Online Contents | 1998
| British Library Online Contents | 2007