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Fig. 19 | Built Heritage

Fig. 19

From: Types of lime binders in mortars used for the construction of the Ming Great Wall of China and their importance for the development of a conservation strategy

Fig. 19

Representative thin sections of the dolomitic lime mortars SMT Simatai and JMY Jiangmaoyu (top right and bottom) from Beijing. SMT-top left: bedding mortar with lumps of lime and the indication of dense magnesite (Mgs) and calcite (Cal) in crosspolarised light (xpl). JMY-top right: thin section image of dolomitic lime mortar with the intermediate hydromagnesite (Hgms) of the transformation process to Mgs, Cal or intergranular voids (ppl). JMY- bottom-left: Thin section image of dolomitic lime mortar showing spherulitic carbonate structures and intermediate Hgms in a transition zone (ppl). JMY-right: EDAX image of the Ca- and Mg-enriched regions visible in the thin section. (Source: Tanja Dettmering and Bernhard Middendorf)

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