By F G Dimes, J. Ashurst
One of many difficulties which beset the sensible conservation of stone structures is the fragmentation of the disciplines concerned. This ebook, with either volumes now to be had as one useful paperback, brings those disciplines jointly by way of the involvement of participants with varied reviews and ways to a similar fabric. half one is an advent to the complexities and heritage background of stone conservation by way of the main finished description but produced of the development and ornamental stones utilized in the British Isles.In half , practitioners serious about stone conservation describe ways that significant structural masonry difficulties, secondary construction difficulties and assorted stone floor stipulations can be handled. a number of construction forms and environments has been used to make sure that the extensive scope of universal difficulties is roofed. This moment a part of the booklet could be of functional price to artwork historians, archaeologists, architects, surveyors and engineers, masonry contractors and sculpture conservators in fixing difficulties and in studying to exploit each one other's abilities and adventure. hugely illustratedTwo informative volumes introduced jointly in a brand new paperback editionExcellent authorial mix
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Extra info for Conservation of Building and Decorative Stone (Butterworth-Heinemann Series in Conservation and Museology)
A succession may be traced from a clay, to a slate, to a schist. Lf the minerals are coarse grained and segregated into rough bands the rock is termed a gneiss. A gneiss shows a lesser tendency to split along the bands than does a schist. Marble results from the metamorphism of limestone. The presence of carbon dioxide apparently aids the formation of a granular structure and a rough, microscopic schistosity may be imposed. Because the calcite grains develop an interlocking structure, large blocks, the desired feature for building purposes, may be extracted from between the pre-existing joint system in areas which are not otherwise tectonically disturbed.
5 Well marked horizontal bedding in alternating shales and limestones of the Lower Lias, Jurassic. 3H20); and the calcium magdesium carbonate, dolomite (CaMg(C03)2). Groundwater circulating through the sediments before or after lithification, may take mineral matter existing in the sediment into solution and re-deposit it, normally around some kind of nucleus to form a concretion. 2). It should be remembered, however, that few sediments are composed exclusively of one type of constituent grain.
But some limestones are friable, some are compact and it is this quality which determines the ease with which they can be worked-their apparent hardness. A sandstone made up of grains of quartz ( H = 7 ) , and thus hard may appear soft because the grains are not well cemented and the rock can be powdered in the hand. Toughness, or the ability to resist abrasion generally, is a more desirable quality than hardness. An old, simple but nevertheless effective and quick test may easily be performed to give an indication of the hardness of a rock.