scholarly journals Database of climatic data as a rewarding tool for inclusion of weather observations in computational service life assessments of historical buildings

2013 ◽  
Author(s):  
K. Ďurana ◽  
J. Maděra ◽  
R. Černý
Keyword(s):  
Service Life ◽  
Climatic Data ◽  
Historical Buildings ◽  
Weather Observations ◽  
Computational Service

EFFECT OF ALKOXYSILANE-BASED TREATMENT ON THE DURABILITY OF NORTH CYPRUS STONES FOR CONSTRUCTION

2021 ◽  
Vol 16 (1) ◽  
pp. 179-196
Author(s):  
Nejdet Ziyaettin ◽  
Kübra Ekiz Barış ◽  
Leyla Tanaçan
Keyword(s):  
Service Life ◽  
Accelerated Aging ◽  
Pulse Velocity ◽  
Life Assessment ◽  
Salt Crystallization ◽  
Diffusion Resistance ◽  
Historical Buildings ◽  
Durability Properties ◽  
Northern Cyprus ◽  
Before And After

ABSTRACT Limestones are generally vulnerable to various weathering effects, hence, protection and consolidation of them is necessary. Locally available limestones of Northern Cyprus have been used in both historical buildings dated back to the 16th century for conservation applications and new buildings mostly as a cladding material. However, certain decay patterns exist on these stones. In the current study, the service life of Cyprus stones was inspected. Alkoxysilane-based consolidation and protection treatments were applied on new quarried stones to enhance the stone properties and aged stones to conserve and protect the architectural heritage. Service life assessment was performed by applying accelerated aging tests on both new and aged stones before and after treatments. The treatments improved the physical, mechanical and durability properties of the stones in terms of unchanging the water vapor diffusion resistance factor, decreasing the porosity and the water absorption ratio, increasing the ultrasound pulse velocity, the compressive and the flexural strengths, and improving the resistance of the stones against wetting-drying, freeze-thaw, salt crystallization and SO2 vapour effects. The combination of consolidation and protection treatment (K2) was more efficient on the properties of the stones compared to only protection treatment (K1) due to the better penetration capacity, higher decreasing ratio of the porosity, and higher improvement of the physical, mechanical and durability properties. The treatments also improved the properties of the aged stones; thus, it may be inferred that treatment would benefit the conservation of historical buildings.

scholarly journals Service Life Assessment of Historical Building Envelopes Constructed Using Different Types of Sandstone: A Computational Analysis Based on Experimental Input Data

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Václav Kočí ◽  
Jiří Maděra ◽  
Jan Fořt ◽  
Jaromír Žumár ◽  
Milena Pavlíková ◽  
...  
Keyword(s):  
Service Life ◽  
Input Data ◽  
Computational Analysis ◽  
Climatic Conditions ◽  
Building Envelope ◽  
Life Assessment ◽  
Climatic Data ◽  
Historical Building ◽  
Building Envelopes ◽  
Different Types

Service life assessment of three historical building envelopes constructed using different types of sandstone is presented. At first, experimental measurements of material parameters of sandstones are performed to provide the necessary input data for a subsequent computational analysis. In the second step, the moisture and temperature fields across the studied envelopes are calculated for a representative period of time. The computations are performed using dynamic climatic data as the boundary conditions on the exterior side of building envelope. The climatic data for three characteristic localities are experimentally determined by the Czech Hydrometeorological Institute and contain hourly values of temperature, relative humidity, rainfalls, wind velocity and direction, and sun radiation. Using the measured durability properties of the analyzed sandstones and the calculated numbers of freeze/thaw cycles under different climatic conditions, the service life of the investigated building envelopes is assessed. The obtained results show that the climatic conditions can play a very significant role in the service life assessment of historical buildings, even in the conditions of such a small country as the Czech Republic. In addition, the investigations reveal the importance of the material characteristics of sandstones, in particular the hygric properties, on their service life in a structure.

Contribution to Solving the Damp Masonry of the Romanesque Church

2018 ◽  
Vol 776 ◽  
pp. 167-176
Author(s):  
Eva Burgetová ◽  
Kristýna Michalová ◽  
Marco Violo
Keyword(s):  
Service Life ◽  
Historical Buildings ◽  
Moisture Movement ◽  
Non Invasive ◽  
Religious Architecture

The paper deals with damp investigation of the St Giles Church in Milevsko Monastery which is an important example of the Romanesque religious architecture. Non-invasive rehabilitation measure, designed by authors and based on detailed damp investigation and analysis, gives support natural moisture movement in structure and respects outstanding importance of this unique Romanesque monument. Protection of building against water and moisture belongs to the most important measures in ensuring the service life and serviceability of historical buildings.

Analysis of Suitability of Mortar Used for Reconstruction

2014 ◽  
Vol 923 ◽  
pp. 77-80 ◽  
Author(s):  
Radka Pernicová ◽  
Daniel Dobiáš
Keyword(s):  
Service Life ◽  
Chemical Analysis ◽  
Frost Resistance ◽  
Mechanical Parameters ◽  
Historical Buildings ◽  
Paper Properties ◽  
Load Bearing ◽  
Structure Characteristics ◽  
Natural Factors ◽  
Bearing Structure

Assessment of suitability of mortar intended for reconstruction based on their characteristics, namely basic, hygric and mechanical parameters, chemical analysis and frost resistance, is presented in this paper. Properties of the load bearing structure as well as natural factors were also taken into account in assessing the suitability of the used mortars. Comparative measurements with original historic plaster are done as well. On the basis of the experiments performed, it can be concluded that not only mortar properties but also environment conditions and technology of application as well as load bearing structure characteristics have a great importance to the service life of the repaired parts of historical buildings.

How to Evaluate Remote Tower Metrics in Connection With Weather Observations

2018 ◽  
Vol 8 (2) ◽  
pp. 100-111 ◽  
Author(s):  
Maik Friedrich ◽  
Christoph Möhlenbrink
Keyword(s):  
Traffic Control ◽  
Air Traffic Control ◽  
Influential Factors ◽  
Air Traffic ◽  
Weather Event ◽  
Evaluation Of Performance ◽  
Weather Events ◽  
Weather Observations ◽  
Validation Experiment ◽  
Remote Controller

Abstract. Owing to the different approaches for remote tower operation, a standardized set of indicators is needed to evaluate the technical implementations at a task performance level. One of the most influential factors for air traffic control is weather. This article describes the influence of weather metrics on remote tower operations and how to validate them against each other. Weather metrics are essential to the evaluation of different remote controller working positions. Therefore, weather metrics were identified as part of a validation at the Erfurt-Weimar Airport. Air traffic control officers observed weather events at the tower control working position and the remote control working position. The eight participating air traffic control officers answered time-synchronized questionnaires at both workplaces. The questionnaires addressed operationally relevant weather events in the aerodrome. The validation experiment targeted the air traffic control officer’s ability to categorize and judge the same weather event at different workplaces. The results show the potential of standardized indicators for the evaluation of performance and the importance of weather metrics in relation to other evaluation metrics.

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