scholarly journals Corrosion at low moisture content in both carbonated and chloride polluted concrete – Villa E-1027, a case study

2019 ◽  
Vol 289 ◽  
pp. 10007
Author(s):  
Elisabeth Marie-Victoire ◽  
Myriam Bouichou
Keyword(s):  
Reinforced Concrete ◽  
Moisture Content ◽  
Cultural Heritage ◽  
Environmental Conditions ◽  
Electrochemical Measurements ◽  
Corrosion Activity ◽  
Definition Of ◽  
Ancient Monuments ◽  
Non Destructive

Corrosion in reinforced concrete is generally attributed to either carbonation or chloride presence in the vicinity of the bars. But in the field of cultural heritage, especially for the most ancient monuments, it is not rare to encounter both carbonated and chloride polluted concrete, inducing heavy corrosion, as was the case in the Villa E-1027 in Roquebrune-Cap-Martin, on the French Mediterranean seashore. The villa was designed by Eileen Gray and Jean Badovici between 1926 and 1929. Due to aggressive environmental conditions and a period of dereliction, the concrete of the villa was quite heavily decayed and a deep restoration was led between 2000 and 2006. But after a little more than 10 years, and despite active maintenance, the villa is again facing corrosion induced decay. Prior to the definition of a new restoration protocol, to better evaluate the corrosion activity, in 2017 a permanent monitoring of moisture and temperature both in the air and in the concrete was installed. In the meantime, a series of instant electrochemical measurements was performed from 2017 to 2018. A first analysis of the results of the monitoring and the non-destructive tests clearly evidences that probably due to the conjunction of the carbonation of the concrete and external active chloride pollution, corrosion can happen at quite low moisture content.

Assessment of a cracked reinforced concrete supporting structure for a converter in a steel melting shop through non-destructive testing and a statistical approach – a case study

2020 ◽  
Vol 62 (11) ◽  
pp. 633-641
Author(s):  
D Das ◽  
S R Debbarma ◽  
D Bouri ◽  
S Banerjee ◽  
S Chatterjee
Keyword(s):  
Reinforced Concrete ◽  
Crack Depth ◽  
Critical Conditions ◽  
Test Sequence ◽  
Steel Melting ◽  
Test Results ◽  
Scientific Review ◽  
Supporting Structure ◽  
Non Destructive

The subject of this paper is the occurrence of cracks and other types of damage, such as delamination of the reinforcement cover, carbonation, porosity, etc, which have occurred in a reinforced concrete supporting structure for a converter in a steel melting shop in India. The structure consists of two thick reinforced concrete walls on which the converter rests. Converters are used in a steel melting shop for blowing oxygen through hot metal and steel is produced through a reaction with carbon, silicon, phosphorus, sulphur, etc. A scientific review of the existing non-destructive test methods is carried out with reference to this case study and critical features of the testing process are described, which will help site engineers to correctly devise the test sequence and analysis procedure for assessment of the structures in specific critical conditions. Crack depth is estimated by analysing test results based on the ultrasonic pulse velocity. The paper explains how appropriate selection of the method and basic parameters is essential for estimating the most accurate crack depth. Lack of understanding of the existing condition of the material of the structure may lead to an incorrect interpretation of the test results. Further to this, a simple statistical procedure is described to identify significant cracks without detailed testing. The repair methodology and its specific features are also discussed in this paper. This case study on the assessment of the converter supporting structure will help engineers to provide solutions for similar types of damaged structure found in industry.

scholarly journals EXPERIENCING THE INACCESSIBLE. A FRAMEWORK FOR VIRTUAL INTERPRETATION AND VISUALIZATION OF REMOTE, RISKY OR RESTRICTED ACCESS HERITAGE PLACES

2019 ◽  
Vol XLII-2/W15 ◽  
pp. 1171-1178
Author(s):  
I. Trizio ◽  
S. Brusaporci ◽  
A. Luigini ◽  
A. Ruggieri ◽  
A. Basso ◽  
...  
Keyword(s):  
Cultural Heritage ◽  
Satisfactory Result ◽  
Environmental Conditions ◽  
Point Cloud ◽  
Laser Scanning ◽  
High Rate ◽  
The Poor ◽  
Start Up ◽  
Poor Lighting

<p><strong>Abstract.</strong> In order to be properly handed down, especially in particular conditions with a high rate of vulnerability, cultural heritage requires documentation and enhancement strategies. The case study presented in this paper is particularly critical not only for the conservation conditions, but especially for the environmental conditions: the Catacombs of San Vittorino have complex conditions of recovery, because of the nature of the artefact and because of the poor lighting of the main environments. For this particularity, a workflow was developed that, in order to achieve the creation of an immersive device navigable by digital viewers such as Oculus Rift or similar, required the start-up of shooting by laser scanning, and then treat the point cloud with different software, in order to obtain a satisfactory result that, in other contexts, could have started easily from a photogrammetric shooting.</p>

CONDITIONAL ASSESSMENT SYSTEM FOR REINFORCED CONCRETE MARINE STRUCTURES – A CASE STUDY

2021 ◽  
Vol 162 (A4) ◽  
Author(s):  
R K Vanama ◽  
B Ramakrishnan ◽  
K Balasubramanian ◽  
S Patil
Keyword(s):  
Reinforced Concrete ◽  
Assessment System ◽  
Tidal Range ◽  
Marine Structures ◽  
Damage Level ◽  
Condition Rating ◽  
Marine Structure ◽  
Cr System ◽  
Non Destructive

Current study mainly focusses on the development of a conditional assessment system for reinforced concrete structures present in marine environment demonstrating with a case study of cargo berths (CB) at Deendayal Port Trust, Kandla, Gujarat, India. The maximum tidal range at the study area is nearly 8m, making the field non-destructive tests (NDT) challenging. The proposed assessment system is based on the damage level classification (DLC) of structure, evaluated by a set of widely used NDTs. The study further investigates the usage of DLC system in comparison with the Condition Rating (CR) method developed by Verma et al. NDTs were conducted at 182 locations between CB 7-10 and observed that the condition of the marine structure, indicated by CR system and DLC system is similar irrespective of their different test approaches. The proposed DLC assessment system is reliable, quick, efficient and requires relatively lesser efforts compared to the CR system.

scholarly journals The ancient Roman gate along Appian way: San Sebastiano Gate

X ◽  
2020 ◽  
Author(s):  
Michele Russo ◽  
Fabio Lanfranchi ◽  
Laura Carnevali
Keyword(s):  
Cultural Heritage ◽  
Middle Ages ◽  
Geometric Analysis ◽  
3D Modelling ◽  
Integrated Analysis ◽  
Survey Techniques ◽  
Complex Building ◽  
Residential Use ◽  
Definition Of

The application of integrated survey techniques and 3D modelling methodologies for Cultural Heritage analysis is now considered a consolidated process, while preserving and suggesting continuous research lines related from one side to the evolution of acquisition and restitution instruments, from the other to the problems linked to the specific case study and the goal of the research. This article describes the analysis of one of the largest and best-preserved gates of Rome, located within the Aurelian walls: Porta San Sebastiano. The original name of this gate was Porta Appia, transformed in the Middle Ages into San Sebastiano from the name of the Christian martyr buried in the Basilica on the Via Appia, located just outside the walls. The current gate aspect is the result of many architectural changes over the centuries, as well as a transformation happened in the twentieth century which has led it to a residential use, a unique example of its kind. Through the integration of different survey techniques, a geometric analysis of the complex building is completed, highlighting the construction complexity and the spatial articulation. A parametric model of a portion of the building is then suggested, aimed at understanding the logic underlying the definition of a HBIM model related to an existing complex artefact. Through an integrated analysis, the aim of the article is to provide an advancement in the knowledge of the specific Cultural Heritage through the integration of complementary methods of analysis and representation.

The story of two historical textile fragments: Technical analysis and reconstruction of the lost textile pattern

2021 ◽  
pp. 004051752110174
Author(s):  
Mateo M Kodrič Kesovia ◽  
Željko Penava ◽  
Danijela Jemo
Keyword(s):  
Cultural Heritage ◽  
Large Scale ◽  
18Th Century ◽  
Technical Documentation ◽  
Multidisciplinary Research ◽  
Textile Materials ◽  
Manufacturing Techniques ◽  
Non Destructive ◽  
Complex Matter

Cultural heritage textile artifacts that have been preserved only in their smaller fragmented remains represent a very interesting and complex matter, very rarely analyzed and studied individually as a separate entity. This case study covers multidisciplinary research conducted on two 18th century silk fragments with a seemingly identical pattern. Demonstrating the possibilities and challenges which arise when analyzing and interpreting incomplete cultural heritage textile materials, this study can serve as a stimulus for creating a large-scale database of historical fabrics which would allow comparison based on their differences or common characteristics. By applying only non-destructive and micro-analytical methods it has been determined that the fragments were made of the same material and using the same manufacturing techniques. It has been proven that fragments were not part of the same historical fabric, but most likely originated from different parts of the same liturgical vestment. The reverse engineering process applied to preserved fragments has resulted in a detailed technical documentation and a complete reconstruction of the lost original pattern.

Conditional Assessment System for Reinforced Concrete Marine Structures – A Case Study

2020 ◽  
Vol 162 (A4) ◽  
Author(s):  
R K Vanama ◽  
B Ramakrishnan ◽  
K Balasubramanian ◽  
S Patil
Keyword(s):  
Reinforced Concrete ◽  
Assessment System ◽  
Tidal Range ◽  
Marine Structures ◽  
Damage Level ◽  
Condition Rating ◽  
Marine Structure ◽  
Cr System ◽  
Non Destructive

Current study mainly focusses on the development of a conditional assessment system for reinforced concrete structures present in marine environment demonstrating with a case study of cargo berths (CB) at Deendayal Port Trust, Kandla, Gujarat, India. The maximum tidal range at the study area is nearly 8m, making the field non-destructive tests (NDT) challenging. The proposed assessment system is based on the damage level classification (DLC) of structure, evaluated by a set of widely used NDTs. The study further investigates the usage of DLC system in comparison with the Condition Rating (CR) method developed by Verma et al. NDTs were conducted at 182 locations between CB 7-10 and observed that the condition of the marine structure, indicated by CR system and DLC system is similar irrespective of their different test approaches. The proposed DLC assessment system is reliable, quick, efficient and requires relatively lesser efforts compared to the CR system.

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