S. Pavía and G. Lynch, The characteristics and properties of rubbing bricks used for gauged brickwork. Part II, The Journal of Architectural Conservation, 9, (2), 2003, p7 - 21
The Journal of Architectural Conservation 9 (2) 2003
This paper provides a continuation of ‘The Characteristics and Properties of
Rubbing Bricks used for Gauged Brickwork – Part One’, published by Gerard
Lynch and Sara Pavía in the March 2003 issue of the Journal of Architectural
Conservation. In this, the authors examined the historical background, raw
materials, production methods, use, and weathering characteristics of rubbing
Despite the softness and absence of a protective fireskin, ‘low-fired’ rubbing
bricks are extremely durable. This paper determines the properties and mineralogical
composition of these bricks in order to understand their behaviour in
response to weathering.
It is concluded that the hardness and durability of rubbing bricks are due
partially to the occurrence of mineral cements created by reactive temper. This
temper acts in a manner similar to a pozzolan in a hydraulic lime mortar,
giving rise to the development of mineral cements through hydraulic reaction.
The rubbing bricks show a high level of effective porosity, which influences the
production of mineral cements and the overall durability of the bricks.
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