scholarly journals Thermal, physical and mechanical characterization of volcanic tuff masonries for the restoration of historic buildings

2019 ◽  
Vol 69 (333) ◽  
pp. 179
Author(s):  
M. M. Barbero-Barrera ◽  
N. Flores-Medina ◽  
E. Moreno-Fernández
Keyword(s):  
Canary Island ◽  
Building Materials ◽  
Mechanical Characterization ◽  
Volcanic Rocks ◽  
Point Of View ◽  
Stone Decay ◽  
Historic Buildings ◽  
High Porosity ◽  
Volcanic Tuff

An in-depth knowledge of building materials is essential in order to preserve them. Tuffs are one of the main types volcanic rocks in the Canary Islands. They are mainly used in masonry or as a filler of the ornamental parts of the façades. In both cases, they have been protected to guarantee their durability. However, in recent years, the renderings have been eliminated and the stone has been exposed to the elements. In this paper, two types of Canary-Island volcanic tuffs were characterized from a physical and mechanical point of view as well as their energy conservation, in order to better understand their behaviour and analyze the criteria for preserving them. Thermal conductivity and fluxes increase 2-3 times in wet conditions, as compared to dry ones. This, together with their high porosity demands the use of renderings to avoid stone decay, and at the same time improving living conditions.

scholarly journals Development of Cave Tourism in the Domica Area in Slovakia

2022 ◽  
pp. 196-207
Author(s):  
Barbara Bolechová ◽  
Branislav Kršák ◽  
Csaba Sidor ◽  
Ľubomír Štrba
Keyword(s):  
Medical Tourism ◽  
Service Providers ◽  
Volcanic Rocks ◽  
Point Of View ◽  
Sufficient Evidence ◽  
Extreme Sports ◽  
Economic Point ◽  
Geophysical Processes ◽  
Questionnaire Research

The purpose of the study. The main goal of the study is to determine the most effective solutions for the development of cave tourism and medical tourism, as well as the standard of living and infrastructure of the region, based on the used literature and the questionnaire research on tourism development. Applied methods. The study starts with information about the natural and geological heritage found in the Domica region in Slovakia. It continues with the discovery, construction and characterization of the most significant caves from a tourist and economic point of view. Following the professional characterization, the questionnaire research developed and evaluated in the last stage of the study analyzes the possibility of the development of cave tourism and health tourism in the immediate vicinity of the Domica Cave based on the opinions, remarks and experiences of the service providers in the area. Outcomes. Caves are called natural underground cavities that have formed as a result of geomorphological and geophysical processes under different natural conditions. The caves in the karst are dissolved or are created by the weathering of the bedrock, while after the leakage of gases, caves form as cavities in the volcanic rocks. Few countries have as many different underground karst formations as Slovakia, with 7,014 known caves, of which only 18 can be visited. Discovering these underground wonders is a new challenge for hikers. Interest in caves peaked in the 20th century, when the desire to return to nature and improve the health of patients with respiratory diseases (speleotherapy) became the leading motivation. Today, caves are most often used for recreation. Nevertheless, within geotourism a popular way to explore caves is caving and the associated extreme or less extreme sports that only came to the fore in the 21st century. The results of the research of this study are sufficient evidence that the region is suitable for the development of cave tourism and medical tourism, for which the most obvious solution is to create an international geopark.

scholarly journals Characterization of clay deposits in the Adrar region, with a view to their valorization in the building materials industry

2018 ◽  
Vol 149 ◽  
pp. 01079
Author(s):  
Abbou Mohammed ◽  
Moulay Omar Hassan ◽  
Semcha Abdélaziz ◽  
Kazi-Aoual Fatiha
Keyword(s):  
Construction Industry ◽  
Building Materials ◽  
Local Development ◽  
Construction Materials ◽  
Sedimentary Basins ◽  
Point Of View ◽  
Clay Deposits ◽  
Algerian Sahara ◽  
Local Materials

In the context of sustainable local development of the Adrar region, one of the largest regions in the Algerian Sahara. The search for local useful substances has been initiated by the Algerian state to cover the need for building materials in the construction industry. However, from a geological point of view, the Adrar zone is located in the extension of the primary chain of the Ougarta which separates two sedimentary basins of Reggane and Timimoun, as well as the basin of Sbâa. In this context, an experimental study is focused on the characterization of clay deposits, with a view to their valorization in the construction materials industry (ceramics) sector, with the aim of contributing to the use of local materials.

scholarly journals Mechanical characterization and reinforcement of the adobe material of the Chellah archaeological site

2020 ◽  
Vol 150 ◽  
pp. 03022
Author(s):  
Sana Simou ◽  
Khadija Baba ◽  
Nacer Akkouri ◽  
Mohammed Lamrani ◽  
Mohammed Tajayout ◽  
...  
Keyword(s):  
Building Materials ◽  
Mechanical Characterization ◽  
Archaeological Site ◽  
Mechanical Tests ◽  
Actual State ◽  
Historical Buildings ◽  
Support Intervention ◽  
Sem Study ◽  
Wood Shaving

The evaluation of historical buildings has always posed significant challenges due to the difficulties associated with the characterization of complex geometries, the variability of the properties of building materials and the actual state of damage to these structures. This challenge is even more complex when it concerns historical adobe masonry buildings, because earthen masonry has a high variability and rapid deterioration over time if it is not properly maintained. In the context of the previous, it was important to provide information to support intervention projects in historic centres. This research involves the experimental analysis of the adobe material collected from the Chellah archaeological site (Rabat-Morocco), in order to study the mechanical behaviour of this material as well as that reinforced by wood shaving. A series of mechanical tests carried out, which include compressive and tensile strength on the adobe material and the mixture adobe/wood fibre in different proportions. The improvement of the mechanical properties of the reinforced adobe, led us to a SEM study, which was carried out on the surface of the test specimens to examine the morphology and observe the interfaces of the adobe/wood mixture, as well as the state of dispersion of the fibres in the adobe mixture.

Spectro-mechanical Characterization of Aromaticity and Maturity of Kerogens in Oil Shale at 6 nm Spatial Resolution

2018 ◽  
Author(s):  
Devon Jakob ◽  
Le Wang ◽  
Haomin Wang ◽  
Xiaoji Xu
Keyword(s):  
Spatial Resolution ◽  
Oil Shale ◽  
Infrared Imaging ◽  
Mechanical Characterization ◽  
Optical Diffraction ◽  
Chemical Compositions ◽  
Valuable Insight ◽  
Eagle Ford Shale

<p>In situ measurements of the chemical compositions and mechanical properties of kerogen help understand the formation, transformation, and utilization of organic matter in the oil shale at the nanoscale. However, the optical diffraction limit prevents attainment of nanoscale resolution using conventional spectroscopy and microscopy. Here, we utilize peak force infrared (PFIR) microscopy for multimodal characterization of kerogen in oil shale. The PFIR provides correlative infrared imaging, mechanical mapping, and broadband infrared spectroscopy capability with 6 nm spatial resolution. We observed nanoscale heterogeneity in the chemical composition, aromaticity, and maturity of the kerogens from oil shales from Eagle Ford shale play in Texas. The kerogen aromaticity positively correlates with the local mechanical moduli of the surrounding inorganic matrix, manifesting the Le Chatelier’s principle. In situ spectro-mechanical characterization of oil shale will yield valuable insight for geochemical and geomechanical modeling on the origin and transformation of kerogen in the oil shale.</p>

MECHANICAL CHARACTERIZATION OF POLYMER MATERIALS UNDER LOW STRAIN RATE LOADING

2017 ◽  
Vol 5 (3) ◽  
pp. 8
Author(s):  
KUMAR DINESH ◽  
KAUR ARSHDEEP ◽  
AGGARWAL YUGAM KUMAR ◽  
UNIYAL PIYUSH ◽  
KUMAR NAVIN ◽  
...  
Keyword(s):  
Strain Rate ◽  
Mechanical Characterization ◽  
Polymer Materials ◽  
Strain Rate Loading ◽  
Low Strain Rate

MECHANICAL CHARACTERIZATION OF VEGETAL COMPOSITES USING DIC

2019 ◽  
Author(s):  
Alexandre Luiz Pereira ◽  
Rafael Oliveira Santos ◽  
DOINA BANEA ◽  
Álisson Lemos
Keyword(s):  
Mechanical Characterization

The Analyses of Learning Strategies in English as a Second Language: Theoretical Classification and Measurement Test

2020 ◽  
Vol 4 (2) ◽  
pp. 118-129
Author(s):  
Asti Gumartifa ◽  
◽  
Indah Windra Dwie Agustiani
Keyword(s):  
Language Learning ◽  
Learning Outcomes ◽  
Learning Strategies ◽  
Learning Process ◽  
English Learners ◽  
English Language ◽  
Point Of View ◽  
Effective Learning ◽  
The Impact

Gaining English language learning effectively has been discussed all years long. Similarly, Learners have various troubles outcomes in the learning process. Creating a joyful and comfortable situation must be considered by learners. Thus, the implementation of effective learning strategies is certainly necessary for English learners. This descriptive study has two purposes: first, to introduce the classification and characterization of learning strategies such as; memory, cognitive, metacognitive, compensation, social, and affective strategies that are used by learners in the classroom and second, it provides some questionnaires item based on Strategy of Inventory for Language Learning (SILL) version 5.0 that can be used to examine the frequency of students’ learning strategies in the learning process. The summary of this study explains and discusses the researchers’ point of view on the impact of learning outcomes by learning strategies used. Finally, utilizing appropriate learning strategies are certainly beneficial for both teachers and learners to achieve the learning target effectively.

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