Colella Abner, Capasso Ilaria, Iucolano Fabio
Dipartimento di Scienze della Terra, dell'Ambiente e delle Risorse(DiSTAR), University of Naples Federico II, Via Vicinale Cupa Cintia 21, 80126 Naples, Italy.
Department of Engineering and Geology, University of Chieti-Pescara "G d'Annunzio", Viale Pindaro 42, 65122 Pescara, Italy.
Materials (Basel). 2021 May 12;14(10):2513. doi: 10.3390/ma14102513.
This research explores the new perspectives in conservation and protection of two macroporous tuff stones, widely employed in the architectural heritage of Campania region, characterized by highly heterogeneous rock fabric and texture and a variable mineralogical composition that represent crucial factors responsible for their weak durability. The consolidation treatments were performed with a recently and widely used suspension of nano-silica crystals in water and with a lithium silicate solution that has received up to now scarce attention as a consolidant agent. Physical investigations (open porosity, Hg porosimetry, water absorption), morphological observations (SEM analyses) and visual appearance test (colorimetric measurements), along with assessments of performance indicators such as ultrasonic pulse velocity, surface cohesion test (peeling test) and durability test (salt crystallization), were carried out to investigate the consolidation effectiveness. Overall, lithium silicate consolidant showed a better behavior in terms of superficial cohesion, a most successful strengthening action and a considerable enhancement of salt resistance.
本研究探索了保护坎帕尼亚地区建筑遗产中广泛使用的两种大孔凝灰岩的新视角。这两种凝灰岩具有高度不均匀的岩石结构和纹理，以及可变的矿物成分，这些是导致其耐久性差的关键因素。固结处理采用了一种最近广泛使用的纳米二氧化硅晶体水悬浮液，以及一种迄今为止作为固结剂很少受到关注的硅酸锂溶液。进行了物理研究（开孔率、汞压汞法、吸水率）、形态观察（扫描电子显微镜分析）和外观测试（比色测量），以及对诸如超声波脉冲速度、表面粘结力测试（剥离试验）和耐久性测试（盐结晶）等性能指标的评估，以研究固结效果。总体而言，硅酸锂固结剂在表面粘结力方面表现更好，强化作用更成功，耐盐性有显著提高。
