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Keywords = resistography

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28 pages, 14634 KB  
Article
On-Site Risk Assessment Methodology of Historic Timber Structures: The Case Study of Santa Cruz Church
by Javier Sola-Caraballo, José María Rincón-Calderón, Carlos Rivera-Gómez, José Antonio López-Martínez and Carmen Galán-Marín
Buildings 2022, 12(7), 935; https://doi.org/10.3390/buildings12070935 - 1 Jul 2022
Cited by 15 | Viewed by 4998
Abstract
The conservation and repair of historic structures require significant resources. Therefore, it is important to conduct a complete assessment of the object. Specifically, historical timber frame structures are very common in the Spanish and Andalusian geographic area. This research proposes and develops a [...] Read more.
The conservation and repair of historic structures require significant resources. Therefore, it is important to conduct a complete assessment of the object. Specifically, historical timber frame structures are very common in the Spanish and Andalusian geographic area. This research proposes and develops a simplified approach to facilitate decision making when faced with this complex work. By the application of long-established non-destructive tests, such as organoleptic and measuring inspection, resistography, and electric moisture content test, combined with visual classification parameters, these data were used as boundary conditions into a simplified structural calculation method. This process, which is simpler than other calculation systems, allows compiling important information about the safety level of the structure and its critical points. Finally, it allows for a better approach to repair work while rationalizing resources. This method was applied to a historical structure, during an 18th century church repair project. The assessment methodology provided important information about the conservation state of the timber frame and its structural suitability. Full article
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8 pages, 1400 KB  
Communication
Vitality Assessment of Visually Healthy Trees in Estonia
by Eneli Allikmäe, Diana Laarmann and Henn Korjus
Forests 2017, 8(7), 223; https://doi.org/10.3390/f8070223 - 26 Jun 2017
Cited by 23 | Viewed by 5690
Abstract
Root rots are considered the most important forest diseases in Estonia, causing serious concern in forest management. The majority of trees infected by forest pathogens lack easily-detectable visual symptoms, making it difficult to detect decay in a tree. We assessed the general health [...] Read more.
Root rots are considered the most important forest diseases in Estonia, causing serious concern in forest management. The majority of trees infected by forest pathogens lack easily-detectable visual symptoms, making it difficult to detect decay in a tree. We assessed the general health condition of visually healthy trees in intensively managed Norway spruce (Picea abies L. Karst.) and Scots pine (Pinus sylvestris L.) stands with resistography in order to identify trees infected by root rot. We found that 8.0% of Norway spruces and 1.6% of Scots pines had well-developed internal decay on the root collar regardless of having no external symptoms of root rot. Visually healthy trees growing on permanent forest land experienced more decay than trees growing on former agricultural land. The radial proportion of decay of damaged trees was 61% in Norway spruces and 35% in Scots pines. The results suggest that resistography can be used as a reliable method for tree vitality assessment. Full article
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