Schiavon,N., Mazzocchin,G.A. and Baudo,F.(2008): Chemical and mineralogical characterisation of weathered historical bricks from the Venice lagoonal environment. Environ.Geol., 56, 767-775.

『ベニスの潟環境にある風化した歴史的なレンガの化学的および鉱物学的特徴づけ』


Abstract
 Surficial and bulk samples of historical bricks of different age (from XII to XVIII centuries) recovered from a campaign of archaeological excavations recently carried out at the site of a medieval monastery in the S.Giacomo in Paludo Island in the Venice Lagoon have been characterised by FT-IR, TGA-DTG, and DTA, XRD, SEM + EDS. The samples belong to a particular brick type commonly used in the Venice region: the “altinella brick”. The bulk relative abundance of primary (i.e. calcite and dolomite) and secondary firing minerals (i.e. diopside and wollastonite) in the bricks coupled with their relative geometrical dimensions allows placing the samples in a chronological sequence according to known historical changes in brickmaking firing temperatures and practices. Most of the bricks were used as paving material and have been exposed to the action of seawater salts (chlorides and sulphates) due to periodical submersion following high tide episodes. Salt-laden (gypsum, halite,mirabilite) surficial patinas are indeed present but salt weathering does not appear to have affected the overall structural soundness of the bricks in this now abandoned island as it is the case with brickwork located in other more populated (and polluted) areas in Venice and its lagoon.

Keywords: Historical bricks; Venice Lagoon; Altinella brick; Salt-weathering』

Introduction
Materials and techniques
Results
 Samples: area 1000
 Samples: area 3000
 Samples: area 7000
Discussion
Conclusions
References


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