The use of natural stone consolidators in historic buildings, when applicable, makes it possible to improve the internal cohesion of the stones and restore or improve the original mechanical properties that the material once had. This paper describes the in situ and lab tests on the characterization of a very porous natural sandstone used in the construction of a late 17th century Fort, located near Sines, on the south-western coast of Portugal, classified as a Property of Public Interest. Given its location, in a most aggressive environment, this construction has suffered severe degradation. A representative number of samples (stones) were taken from the somewhat degraded surrounding structures attached to the Fort. Part of these samples were subjected to a consolidation process using a commercial ethyl silicate and then submitted to physical and mechanical tests with the purpose of evaluating the consolidation action. The remaining (unconsolidated) part of the samples were subjected to the same characterization tests, for comparison.

The work carried out showed the effectiveness of the consolidation treatment in reinforcing the mechanical strength of the sandstone.

如果适用，在历史建筑中使用天然石材加固剂可以改善石材的内部凝聚力，并恢复或改善该材料曾经具有的原始机械性能。本文介绍了原位实验室测试，对葡萄牙西南海岸锡尼斯附近建造17世纪晚期堡垒的多孔多孔天然砂岩的特性进行了归类，列为公共利益。鉴于其位置，在最恶劣的环境中，该建筑遭受了严重的退化。有代表性的样品（石头）是从附着在堡垒上的经过某种程度降解的周围结构中提取的。使用市售硅酸乙酯对这些样品中的一部分进行固结处理，然后进行物理和机械测试，以评估固结作用。样品的其余部分（未合并）进行了相同的表征测试，以进行比较。

进行的工作表明了固结处理在增强砂岩机械强度方面的有效性。