scholarly journals Application of a combined computational-experimental approach for the service life estimate of exterior plasters of historical buildings

2009 ◽  
Author(s):  
V. Kočí ◽  
J. Maděra ◽  
R. Černý ◽  
P. Rovnaníková
Keyword(s):  
Service Life ◽  
Experimental Approach ◽  
Historical Buildings

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 PENERAPAN WPAP DENGAN COREL DRAW PADA GANTUNGAN KUNCI BERBAHAN RESIN DI KELOMPOK UKM SUMATERA UTARA

2020 ◽  
Vol 9 (2) ◽  
pp. 430
Author(s):  
Rilies Diorita Sihombing ◽  
Fuad Erdansyah
Keyword(s):  
Graphic Design ◽  
Manufacturing Process ◽  
Qualitative Method ◽  
Experimental Approach ◽  
Historical Buildings ◽  
Software Application ◽  
The North ◽  
Production Stages ◽  
Design Style ◽  
North Sumatra

AbstrakPenelitian ini didasari dengan beragamnya peninggalan dan budaya visual yang ada di Sumatera Utara, seperti: Pakaian adat, rumah adat, kegiatan  tradisonal, bangunan bersejarah. Keberagaman tersebut menjadi daya Tarik bagi para wisatawan yang berkunjung ke Sumatera Utara dengan memiliki souvenir yang unik dan modern yaitu dengan memvisualisasikan kedalam aliran gaya desain modern WPAP pada gantungan kunci. Setelah melakukan survei di Galeri Promosi Usaha Kecil Menengah (UKM), Sumut Pekan Raya Sumatera Utara (PRSU), tampak bahwa belum adanya penerapan WPAP pada gantungan kunci yang berbahan resin. Hal inilah yang melatar belakangi penelitian ini. Penelitian ini dilaksanakan dengan metode kuantitatif deskripsi dengan pendekatan esperimental. Dimana proses pembuatan produk diawali dengan pengenalan desain grafis dan aplikasi software Corel Draw, mengamati demonstrasi pembuatan WPAP terlebih dulu kemudian melakukan perancangan desain produk dan penerapan WPAP menjadi gantungan kunci berbahan resin. Hasil dari penelitian ini adalah produk gantungan kunci anomali budaya visual WPAP Sumatera Utara berbahan resin yang dibuat oleh para pelaku UKM dimana produk yang dibuat layak untuk diproduksi karena para pelaku UKM sudah  memahami teori dan konsep dasar rancangan desain WPAP serta tahapan produksi dari pencetakan, hingga finishing  produk. Dengan dilaksakannya penelitian ini diharapkan mampu membantu masyarakat terutama pelaku UKM dalam memperbaiki perekonomian yang kian merosot akibat pandemi Covid-19 serta memajukan pariwisata Sumatera Utara.  Kata Kunci: desain, WPAP, cenderamata, resin, UKM.AbstractThis research is based on the variety of cultural heritage and visuals in North Sumatra, such as: traditional clothing, traditional houses, traditional activities, historical buildings. This diversity is an attraction for tourists visiting North Sumatra by having unique and modern souvenirs, namely by visualizing into the flow of the modern WPAP’s  design style on the key chain. After conducting a survey at the PRSU North Sumatra SME Promotion Gallery, it appears that there is no WPAP application on key chains made from resin. This is the background of this research. This research was conducted using a descriptive qualitative method through an experimental approach. The manufacturing process begins with an introduction to graphic design and the Corel Draw software application, observing the demonstration of making WPAP first then designing the product design, and application the WPAP into a resin key chain. The result of this research is the product of the visual cultural anomaly key chain of the North Sumatra WPAP made from resin made by UKM players where the products made are feasible to be produced because the SMEs already understand the basic theories and concepts of WPAP design and production stages from printing to finishing product. By carrying out this research, it is hoped that it will be able to help the community, especially SME players, in improving the economy which is increasingly deteriorating due to the Covid-19 pandemic and advancing tourism in North Sumatera.Keywords: design, WPAP, souvenirs, resins, SME. 

Evaluation of CO2 Uptake under Mild Accelerated Carbonation Conditions in Cement-Based and Lime-Based Mortars

2014 ◽  
Vol 980 ◽  
pp. 57-61 ◽  
Author(s):  
Carla Furcas ◽  
Ginevra Balletto ◽  
Stefano Naitza ◽  
Alessandro Mazzella
Keyword(s):  
Carbon Sequestration ◽  
Service Life ◽  
Greenhouse Gases ◽  
Industrial Production ◽  
Experimental Approach ◽  
Curing Time ◽  
Accelerated Carbonation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Life Conditions

The industrial production of cement-based and lime-based materials such as mortars contributes significantly to the release of greenhouse gases such as CO2into the atmosphere. However, a percentage of these emissions is reabsorbed as the mortar hardens, owing to carbonation reactions. This study aims to explore the CO2sequestration capacity of a cement-based (CM) and a lime-based mortar (LM) over the first 28 days of curing. The CO2uptake of CM and LM was experimentally evaluated in mildly accelerated conditions by using a volumetric approach. This procedure enabled us to assess the CO2absorbed after 1, 7 and 28 days from mortar preparation so as to simulate CM and LM behavior during their setting, hardening, and service-life conditions. Through the experimental approach values of 19.1, 25.5 and 26.4 g CO2/kg for CM and 5.0, 11.0 and 16.1 g CO2/kg for LM were obtained. These results, which were validated by means of X-ray diffraction along with calcimetry analysis, confirmed that carbon sequestration by common mortars during their curing time is not negligible.

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.

Experimental Determination of the Effective Resolution Limit in Thick Specimens at High Voltages

1975 ◽  
Vol 33 ◽  
pp. 664-665
Author(s):  
Mircea Fotino
Keyword(s):  
Experimental Approach ◽  
Chromatic Aberration ◽  
Resolving Power ◽  
Biological Research ◽  
Specimen Thickness ◽  
Resolution Limit ◽  
High Voltage Electron Microscopy ◽  
Voltage Electron ◽  
Resolution Level

The use of thick specimens (0.5 μm to 5.0 μm or more) is one of the most resourceful applications of high-voltage electron microscopy in biological research. However, the energy loss experienced by the electron beam in the specimen results in chromatic aberration and thus in a deterioration of the effective resolving power. This sets a limit to the maximum usable specimen thickness when investigating structures requiring a certain resolution level.An experimental approach is here described in which the deterioration of the resolving power as a function of specimen thickness is determined. In a manner similar to the Rayleigh criterion in which two image points are considered resolved at the resolution limit when their profiles overlap such that the minimum of one coincides with the maximum of the other, the resolution attainable in thick sections can be measured by the distance from minimum to maximum (or, equivalently, from 10% to 90% maximum) of the broadened profile of a well-defined step-like object placed on the specimen.

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