A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The Use of Pozzolans in Lime Mortars
In the conservation and restoration of old buildings, a great deal of time and effort is spent on matching the old materials (perhaps centuries old) using modem chemicals and products. Consideration has also to be given to the techniques and skills of the old craftsmen, which in most cases reflected the materials available at the time. Modem materials are much more tightly specified and react much more predictably than the materials manufactured 100 years ago and while modem craftsmen are still highly skilled, there is a higher expectation both of predicted performance and economics than there was centuries ago. Materials have also changed and high calcium lime is typical of such a material. Over the years, this has changed from being an impure raw material into a tightly controlled ‘chemical’ due to pressure, firstly, from the chemical industry and, secondly, from the steel industry. The same changes have not been so apparent in the materials used as pozzolans. While efforts have been, and are being made, to characterize the effects of some of the traditional pozzolans, newer materials are being considered because of their pozzolanic effects. By and large, there is very little specific documented information regarding their properties and performance characteristics to which the specifier, producer or user can refer.
The Use of Pozzolans in Lime Mortars
In the conservation and restoration of old buildings, a great deal of time and effort is spent on matching the old materials (perhaps centuries old) using modem chemicals and products. Consideration has also to be given to the techniques and skills of the old craftsmen, which in most cases reflected the materials available at the time. Modem materials are much more tightly specified and react much more predictably than the materials manufactured 100 years ago and while modem craftsmen are still highly skilled, there is a higher expectation both of predicted performance and economics than there was centuries ago. Materials have also changed and high calcium lime is typical of such a material. Over the years, this has changed from being an impure raw material into a tightly controlled ‘chemical’ due to pressure, firstly, from the chemical industry and, secondly, from the steel industry. The same changes have not been so apparent in the materials used as pozzolans. While efforts have been, and are being made, to characterize the effects of some of the traditional pozzolans, newer materials are being considered because of their pozzolanic effects. By and large, there is very little specific documented information regarding their properties and performance characteristics to which the specifier, producer or user can refer.
The Use of Pozzolans in Lime Mortars
Boffey, Geoffrey (author) / Hirst, Elizabeth (author)
Journal of Architectural Conservation ; 5 ; 34-42
1999-01-01
9 pages
Article (Journal)
Electronic Resource
English
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