59 documents found, page 1 of 6

Aging of Limestones and Silane–Siloxane-Based Protective Hydrophobics: The Impa...

Stones are traditionally used in construction and architectural applications as building elements due to their aesthetic and technical/structural performance. Like other environmental factors (rain, humidity, moisture, salt presence, biological activity, etc.), heating–cooling and freeze–thaw cycles significantly threaten the longevity of stone materials. Hence, considering the socio-economic and cultural value...

Evaluating building stones: Physical-mechanical changes from high-temperature f...

Heritage sites built with natural stone are at risk from fires, which can alter stone properties and compromise its structural integrity. Over 60 studies in the past three decades have examined fire impact on natural stone, providing insights for their prevention and restoration. The primary objectives are to develop effective strategies to mitigate fire risks, protect heritage structures, and ensure the preser...

Comparative multi-analytical study to forecast marble and limestone structural ...

For centuries, natural stone has adorned facades, evolving from thick construction elements to thin cladding applications due to advanced cutting technologies. However, durability issues, especially in thin marble cladding, have surfaced after approximately 50 years of installation, as seen in iconic structures like the Amoco Building and Finlandia Hall. This study focuses on characterizing Carrara and Ruivina ...

Hydrophobic Coatings’ Efficiency and Limestones’ Resistance to Salt Crystallisa...

Stone deterioration is significantly influenced by the process of salt crystallisation. The expansion of salt crystals on a porous framework exerts pressure on the solid fraction, causing the stone to deteriorate when the internal pressure of salt surpasses the stone’s strength. Protective coatings are employed to effectively hinder or substantially reduce the penetration of water and saline solutions. This stu...

Physical-Mechanical Changes in Portuguese, Greek, and Italian Marbles Under Agi...

Bowing, a significant form of decay, poses a crucial challenge in the preservation of historical and contemporary structures, necessitating comprehensive study and analysis. This research focuses on the mechanical alterations induced by aging cycles of temperature and moisture on three distinct marbles—Portuguese, Greek, and Italian— emphasizing their susceptibility to bowing-associated effects. The prevalence ...

Trentepohlia Algae as a Diagnostic Tool for Historic Mediterranean – style Houses

Trentepohlia is a genus of filamentous chlorophytes green algae commonly found in association with fungi and bacteria on building envelopes. Their colonies have a characteristic red colouration which results from the production of b-carotene and hematochrome pigments. They are commonly present on walls, roofs and other external building structures and thrive in humid and shaded environments where sufficient moi...

Aplicação de lamas carbonatadas da industria extrativa e transformadora de pedr...

As lamas carbonatadas (vulgarmente conhecidas por “natas”), resultam do processamento industrial de mármores e/ou calcários explorados no Anticlinal de Estremoz e no Maciço Calcário Estremenho, respectivamente. Tratando-se de materiais homogéneos e relativamente puros (> 95% CaCO 3 ), têm elevado potencial para aplicação industrial pelo que se justifica o estudo da viabilidade técnica e económica de aplicação e...

The romanesque-style rural churchs of Portugal: An initial stride towards the c...

Evaluating the biosusceptibility of natural stone as an supporting tool to prev...

Biodeterioration of construction materials is still a major challenge that conservator-restorers face, especially in historic monuments with high cultural value. Natural stone is highly susceptible to deterioration through physical, chemical, and biological ways, whereas biological proliferation may potentiate both chemical and physical deterioration. The composition of the colonizers and their proliferation ar...

Laboratorial Simulation for Assessing the Performance of Slates as Construction...

This paper presents the results of a laboratory simulation of a subarctic climate carried out in climatic chamber. Realistic daily and seasonal cycles of temperature of a regular subarctic continental climate without dry seasons (Dfc) were simulated and the physical/mechanical properties and performance of the slates were assessed. The slate was selected because of its use as cladding and roofing material in co...