Abstract This research investigates the validity of the Schmidt hammer exposure dating (SHED) technique as a complementary means to date monuments according to the evaluation of the brick decay from masonry exposed to climatic conditions. The degree of surface weathering, I5 (%) is calculated as an indicator of the ageing effect and compared to the absolute age of the churches constructed between 1600 and 1795. This paper discusses the results obtained with such a method and the use of the technique within the framework of historical research. Tests were done on exterior church walls built between the 17th and 19th centuries. All the churches were located within the limited geographical area of Hainaut, in the south of Belgium. Results indicate that SHED provides encouraging results for buildings constructed between 1790 and 1895, with a linear correlation (R2>0.8) between surface weathering of brick façades and their ages. However, the weathering indices show high variability of values for the period 1750−1790, which may confirm that the variable qualities of bricks were in use during this period of time because of the different production techniques. As such, the results highlight the probable influence of the entire manufacturing and construction process and technical improvements in traditional brick-making.

中文翻译：

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砖砌体施密特锤曝光约会

摘要 本研究根据对暴露于气候条件下的砌体砖的腐烂程度的评估，调查了施密特锤暴露测年 (SHED) 技术作为对古迹进行测年的补充手段的有效性。计算表面风化程度 I5 (%) 作为老化效应的指标，并与 1600 年至 1795 年之间建造的教堂的绝对年龄进行比较。本文讨论了使用这种方法获得的结果以及该技术的使用在历史研究的框架内。测试是在 17 世纪和 19 世纪之间建造的教堂外墙上进行的。所有的教堂都位于比利时南部埃诺的有限地理区域内。结果表明，SHED 为 1790 年至 1895 年间建造的建筑物提供了令人鼓舞的结果，砖外墙表面风化与年龄呈线性相关（R2>0.8）。然而，风化指数显示 1750 年至 1790 年期间值的高度可变性，这可能证实由于不同的生产技术，在此期间使用的砖的质量不同。因此，结果突出了整个制造和施工过程以及传统制砖工艺的技术改进可能产生的影响。