Irregular silica cementation in sandstones and its implication on the usability as building stone
Irregular silica cementation in sandstones and its implication on the usability as building stone
复制标题
DOI：
10.1016/j.enggeo.2009.08.006
复制
发表时间：
2010-10
影响因子：
7.4
通讯作者：
J. Nespereira;J. A. Blanco;M. Yenes;D. Pereira
中科院分区：
文献类型：
--
作者：
J. Nespereira;J. A. Blanco;M. Yenes;D. Pereira
西班牙西部出露的古新世砂岩长期以来一直被用于建筑目的。它们的用途差异很大：在一些城市，它们是建造教堂和大教堂（萨莫拉）等建筑物的主要石材，而在其他城市，例如在萨拉曼卡历史区（自 1988 年以来一直是世界遗产），它们被用于该镇最引人注目的古迹的下部 [两座大教堂（12 世纪和 16 世纪）、主广场（1755 年）和贝壳屋） （15世纪）]用于防止侵蚀和风化，因为它们比用于纪念碑较高部分的始新世砂岩更具抵抗力。尽管在某些情况下该解决方案取得了成功，但在其他情况下结果却不太令人满意。古新世砂岩具有重要但不规则的硅质胶结物含量。根据其单轴压缩强度 (UCS)，它们可能是坚固或非常坚固的岩石，但在潮湿条件下，一些选定的样品显示其 UCS 显着下降。此外，可以发现两种类型的蛋白石水泥，一种是各向同性的，另一种是双折射的，前者是最有效的。当各向同性蛋白石水泥与明矾石 [KAl3(SO4)2(OH)6] 一起使用时，强度甚至更高。
Palaeocene sandstones outcropping in Western Spain have long been used for building purposes. Their use varies considerably: in some cities they have been the main stones used in the construction of buildings such as churches and cathedrals (Zamora), whereas in others, such as in the historic district of Salamanca, which has been a World Heritage site since 1988, they have been used in the lower part of the town's most striking monuments [two cathedrals (12th and 16th centuries), the Main Square (1755) and the House of Shells (15th century)] for protection against erosion and weathering, because they are more resistant than the Eocene sandstones used for the higher parts of the monuments. Although in some cases this solution has been successful, in others the results have been less satisfactory. Palaeocene sandstones have an important, although irregular, silica cement content. According to their uniaxial compression strength (UCS) they may be strong or very strong rocks, but under wet conditions some select samples display a significant decrease in their UCS. Furthermore, two types of opal cement can be found, one isotropic and the other birefringent, the former being the most efficient. Strength is even higher when isotropic opal cement is found together with alunite [KAl3(SO4)2(OH)6].